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Strengite

A valid IMA mineral species - grandfathered
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About StrengiteHide

07038470014946343734640.jpg
Johann August Streng
Formula:
FePO4 · 2H2O
Colour:
Purple, violet, pink, peach-blossom-red, carmine, greenish white, colorless; Colourless to pale pink in transmitted light.
Lustre:
Vitreous, Sub-Vitreous, Greasy
Hardness:
3½ - 4
Specific Gravity:
2.84 - 2.87
Crystal System:
Orthorhombic
Member of:
Name:
Named after Johann August Streng (4 February 1830, Frankfurt, Germany - 7 January 1897, Giessen, Germany), Professor of Mineralogy, University of Giessen, Germany. Streng was an assistant to Robert Bunsen at the University of Heidelberg and later professor of chemistry at the Clausthal Mining Academy. Streng was an innovator in new methods of chemical titration.
Dimorph of:
Variscite-Strengite Series.
The phosphate analogue of scorodite.


Unique IdentifiersHide

Mindat ID:
3801
Long-form identifier:
mindat:1:1:3801:6
GUID
(UUID V4):
a84cd6bd-873d-4b94-9700-1abf4a1c06ed

IMA Classification of StrengiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Fe3+(PO4) · 2H2O

Classification of StrengiteHide

8.CD.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
40.4.1.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
19.13.2

19 : Phosphates
13 : Phosphates of Fe alone

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
StgIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
StgThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of StrengiteHide

Vitreous, Sub-Vitreous, Greasy
Transparency:
Transparent, Translucent
Colour:
Purple, violet, pink, peach-blossom-red, carmine, greenish white, colorless; Colourless to pale pink in transmitted light.
Comment:
Usually lght pink
Streak:
White
Hardness:
3½ - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {010}, poor on {001}
Density:
2.84 - 2.87 g/cm3 (Measured)    2.84 g/cm3 (Calculated)

Optical Data of StrengiteHide

Type:
Biaxial (+)
RI values:
nα = 1.697 - 1.708 nβ = 1.708 - 1.719 nγ = 1.741 - 1.745
2V:
Calculated: 72° to 88°
Birefringence:
0.044
Max Birefringence:
δ = 0.044
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong r < v
Pleochroism:
Non-pleochroic

Chemistry of StrengiteHide

Mindat Formula:
FePO4 · 2H2O
Common Impurities:
Al

Crystallography of StrengiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 8.7233(7) Å, b = 9.886(1) Å, c = 10.122(1) Å
Ratio:
a:b:c = 0.882 : 1 : 1.024
Unit Cell V:
872.91 ų
Z:
8
Morphology:
Crystals rarely octahedral {111}; usually thick to thin tabular {001}; also stout prismatic [100] or [010]. May be lathlike, radial fibrous, botyroidal or spherical aggregates and crusts.
Twinning:
Rarely on {201}

Crystallographic forms of StrengiteHide

Crystal Atlas:
Image Loading
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Strengite no.1 - Goldschmidt (1913-1926)
Strengite no.3 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012324StrengiteTaxer K, Bartl H (2004) On the dimorphy between the variscite and clinovariscite group: refined finestructural relationship of strengite and clinostrengite, Fe(PO4)*2H2O Crystal Research and Technology 39 1080-10882004Kreuzberg, Pleystein, Barvaria0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.509 Å(60)
4.383 Å(85)
3.996 Å(45)
3.114 Å(100)
3.002 Å(45)
2.949 Å(45)
2.546 Å(50)
Comments:
ICDD 33-667

Geological EnvironmentHide

Paragenetic Mode(s):
Geological Setting:
Secondary mineral formed under surface or near-surface conditions by the alteration of iron-bearing phosphates, such as Triphylite in pegmatite, or Dufrenite, or may occur in limonite ore deposits and gossans, magnetite iron ores, late-stage mineralization in granite pegmatites, or rarely as a cave mineral.

Type Occurrence of StrengiteHide

Geological Setting of Type Material:
Phosphate-bearing iron ore deposit

Other Language Names for StrengiteHide

German:Strengit
Portuguese:Strengite
Simplified Chinese:红磷铁矿
Spanish:Strengita
Traditional Chinese:紅磷鐵礦

Varieties of StrengiteHide

Aluminian StrengiteContains Al in substitution for Fe(III).

Relationship of Strengite to other SpeciesHide

Member of:
Other Members of this group:
MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
ScoroditeFe3+AsO4 · 2H2OOrth. mmm (2/m 2/m 2/m)
VarisciteAlPO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
YanomamiteInAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
277 photos of Strengite associated with CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2O
237 photos of Strengite associated with BerauniteFe3+6(PO4)4O(OH)4 · 6H2O
201 photos of Strengite associated with RockbridgeiteFe2+Fe3+4(PO4)3(OH)5
185 photos of Strengite associated with KidwelliteNaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33
139 photos of Strengite associated with PhosphosideriteFePO4 · 2H2O
60 photos of Strengite associated with QuartzSiO2
55 photos of Strengite associated with StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2O
51 photos of Strengite associated with Goethiteα-Fe3+O(OH)
50 photos of Strengite associated with HureauliteMn2+5(PO3OH)2(PO4)2 · 4H2O
50 photos of Strengite associated with DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

8.CD.CastellaroiteMn2+3(AsO4)2 · 4H2OMon. 2/m
8.CD.SergeysmirnoviteMgZn2(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CD.05KolbeckiteScPO4 · 2H2OMon. 2/m
8.CD.05MetavarisciteAlPO4 · 2H2OMon. 2/m : P21/b
8.CD.05PhosphosideriteFePO4 · 2H2OMon. 2/m
8.CD.05BonacinaiteSc(AsO4) · 2H2OMon. 2/m
8.CD.10MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10ScoroditeFe3+AsO4 · 2H2OOrth. mmm (2/m 2/m 2/m)
8.CD.10VarisciteAlPO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10YanomamiteInAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.15ParascoroditeFeAsO4 · 2H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
8.CD.20LudlamiteFe2+3(PO4)2 · 4H2OMon. 2/m : P21/b
8.CD.25SterlinghilliteMn2+3(AsO4)2 · 3H2OTric. 1 : P1
8.CD.30RollanditeCu3(AsO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CD.35LiversidgeiteZn6(PO4)4 · 7H2OTric. 1 : P1
8.CD.40ThorasphiteTh2H(PO4,AsO4)3 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pbcn

Fluorescence of StrengiteHide

Not fluorescent in UV

Other InformationHide

Notes:
Soluble in HCl but not in HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for StrengiteHide

References for StrengiteHide

Reference List:

Localities for StrengiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Argentina
 
  • Córdoba Province
    • Cruz del Eje department
      • Candelaria District
Kampf et al. (2010)
    • Punilla Department
      • San Roque District
        • Tanti
Dina (1993)
Demartin et al. (1997)
    • San Alberto Department
      • Tránsito District
        • Pampa de Achala
Gay et al. (1991)
  • San Luis Province
    • Coronel Pringles Department
      • Totoral pegmatitic field
OYARZABAL et al. (H2O)
Australia
 
Trueman (1965)
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
        • Broken Hill
Birch et al. (1997)
          • Broken Hill South Mine (BHS Mine; South Mine)
Birch et al. (1997)
Day (1998)
  • South Australia
    • Barossa Council
      • Penrice
    • Eyre peninsula
      • Middleback Range
        • Iron Duke Complex
Francis (2010)
Francis (2010)
    • Light Regional Council
      • Koonunga
Frost et al. (2004)
    • Pastoral Unincorporated Area
      • Bimbowrie Conservation Park
Australian Journal of Mineralogy
      • Boolcoomatta Reserve (Boolcoomata Station)
Elliott et al. (2023)
      • Iron Knob
Pilkington et al. (1979)
      • Outalpa
        • Ameroo Hill
Australian Journal of Mineralogy
  • Tasmania
    • Huon Valley municipality
      • Southern Islands
Bottrill et al. (2008)
    • Northern Midlands municipality
      • Avoca-Royal George mining district
Bottrill & Baker
  • Victoria
    • East Gippsland Shire
      • Glen Valley
Birch (2018)
Eagle et al. (2015) +1 other reference
Eagle et al. (2015)
    • Mansfield Shire
      • Mansfield
W.D.Birch & D.A.Henry 1993. Phosphate ...
    • Rural City of Wangaratta
    • South Gippsland Shire
      • Hoddle Range
        • Fish Creek
B.Day 1996. What's New in Australia
    • Swan Hill Rural City
      • Lake Boga
  • Western Australia
    • Meekatharra Shire
      • Woodlands Station
Nickel (2008)
    • Port Hedland Shire
      • Abydos Station
        • Wodgina
Jacobson et al. (2007)
Austria
 
  • Styria
    • Bruck-Mürzzuschlag District
      • Krieglach
        • Freßnitzgraben
          • Alpl
C.Auer (2015)
      • Langenwang
Bernhard (2010)
    • Voitsberg District
      • Edelschrott
        • Modriach
          • Herzogberg
Aufschluss 1972 (SB)
      • Krottendorf-Gaisfeld
Postl W et al. (2022)
Belgium
 
  • Wallonia
    • Hainaut
      • Bernissart
        • Blaton
Van Tassel (1966) +7 other references
    • Liège
      • Visé
Van Tassel (1959) +3 other references
    • Luxembourg
      • Vielsalm
        • Cahay
José Dehove collection.
Bolivia
 
  • Potosí
    • Sud Chichas Province
      • Atocha Municipality
        • Cerro Chorolque
Salomon Rivas y Federico Ahlfeld (1998)
Brazil
 
Queiroz (2016)
  • Minas Gerais
    • Conselheiro Pena
      • Barra do Cuieté
Bermanec et al. (2011)
sergio varvello
Krister collection
Sergio Varvello collection +1 other reference
King et al. (1993)
    • Divino das Laranjeiras
      • Linópolis
Jhonatan Gomes minerals collection
fabreminerals specimen
A. M. I. Martins collection
    • Galiléia
      • Sapucaia do Norte
Atencio et al. (2004)
Cassedanne et al. (1999) +1 other reference
    • Itinga
      • Jenipapo pegmatite field
Sergio Varvello collection
  • Pará
    • Canaã dos Carajás
      • Serra Sul Project
        • S11D Deposit
Piló et al. (2023)
Piló et al. (2023)
    • Parauapebas
      • Carajás iron complex
        • N4WS Pit
Piló et al. (2023)
Figueira et al. (2019)
Bulgaria
 
  • Kardzhali Province
    • Momchilgrad Municipality
      • Obichnik
Kunov et al. (1997)
Cameroon
 
  • Adamawa Region
    • Vina
      • Martap
F. Pillard : "Contribution à l'étude de l'altération de la vivianite : cas de la vivianite d'Anloua (Cameroun)
Canada
 
  • Yukon
    • Dawson mining district
Robinson et al. (1992)
Robinson et al. (1992)
Chile
 
  • Antofagasta
    • Antofagasta Province
      • Mejillones
        • Mejillones peninsula
identified by Gerhard Möhn
      • Sierra Gorda
Kampf et al. (2012)
    • El Loa Province
      • San Pedro de Atacama
Raman spectroscopy and EDX by Günter ...
  • Atacama
    • Copiapó Province
      • Tierra Amarilla
SEM-EDS by Joy Desor and Gerhard Möhn
  • Tarapacá
    • Tamarugal Province
      • Pica
        • Collahuasi mining district
Sulphides analysed by geology dep. of ... +1 other reference
Colombia
 
  • San Andrés y Providencia Department
McConnell (1943)
Czech Republic
 
  • Central Bohemian Region
    • Beroun District
      • Cerhovice (Cerkovitz?)
Pauliš +4 other references
      • Hudlice
Vrtiška L. et al. (2018)
      • Olešná
Černý P. et al. (2015) +1 other reference
      • Zaječov
        • Svatá Dobrotivá (St Benigna)
Duda
    • Kutná Hora District
      • Vlkaneč
Povondra et al. (eds.) +1 other reference
    • Rakovník District
      • Roztoky
Černý P (1)
  • Karlovy Vary Region
    • Sokolov District
      • Krásno
Sejkora et al. (2006)
Sejkora et al. (2006)
        • Vysoký Kámen
Sejkora +1 other reference
  • Plzeň Region
    • Domažlice District
Weber
    • Rokycany District
      • Těškov
Janouš +4 other references
  • South Bohemian Region
    • České Budějovice District
      • Horní Stropnice
Welser
  • Ústí nad Labem Region
    • Chomutov District
      • Vejprty
Pauliš P et al. (2020)
  • Vysočina Region
    • Jihlava District
      • Kamenice
        • Řehořov
Houzar S.: Přehled minerálů z ...
    • Pelhřimov District
      • Křeč
Vrtiška L et al. (2017)
    • Žďár nad Sázavou District
      • Bory
        • Horní Bory
          • Cyrilov (Cyrillhof)
new data on the type material. Journal of GEOsciences: 45 (1-2) +3 other references
DR Congo
 
  • Lualaba
    • Dilolo
      • Kisenge-Kamata deposit (Kisenge mining area)
De Putter et al. (2018)
Europe
 
Berbain et al. (2012)
Finland
 
  • Pirkanmaa
    • Orivesi
      • Eräjärvi area
Sandström et al. (2009)
  • South Ostrobothnia
Ilkka Mikkola collection
France
 
  • Auvergne-Rhône-Alpes
    • Allier
      • Vichy
        • Échassières
Queneau (n.d.)
          • Montmins mining district
Chollet Pascal Collection
            • Le Mazet
Pierre Le Roch & Jean-Marc Johannet ... +1 other reference
Cuchet et al. (2000)
    • Puy-de-Dôme
      • Thiers
        • Lachaux
Queneau (n.d.)
  • Brittany
    • Morbihan
      • Pontivy
        • Plumelin
Le Roc'h P. ()
  • French Guiana
Palache et al. (1951)
  • Nouvelle-Aquitaine
    • Creuse
      • Aubusson
        • Soumans
          • Montebras
    • Haute-Vienne
      • Bellac
        • Bessines-sur-Gartempe
perso.wanadoo.fr (2004)
        • Compreignac
perso.wanadoo.fr (2005)
        • Razès
          • Chanteloube
            • Vilatte Quarries (La Vilate)
perso.wanadoo.fr (2004)
Boisson (1988)
perso.wanadoo.fr (2004)
    • Pyrénées-Atlantiques
      • Bayonne
        • Arbouet-Sussaute
Pascale & Daniel Journet
  • Occitanie
    • Hérault
      • Béziers
        • Saint-Vincent-d'Olargues
Audra et al. (2019)
    • Pyrénées-Orientales
      • Céret
        • Collioure
Berbain et al. (2012)
    • Tarn
      • Castres
        • Fontrieu
          • Fumade
Queneau (n.d.)
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Oberwolfach
Walenta (1992)
  • Bavaria
    • Lower Bavaria
      • Regen District
        • Zwiesel
          • Rabenstein
Weiß (1990)
    • Upper Palatinate
      • Amberg-Sulzbach District
        • Auerbach in der Oberpfalz
          • Nitzlbuch (Nitzelbuch)
Weiß (1990)
          • Schleichershof
Geipel (1982) +1 other reference
      • Cham District
        • Waldmünchen
          • Althütte
Weiß (1990)
      • Neustadt an der Waldnaab District
        • Pleystein
Palache et al. (1951) +1 other reference
Dill et al. (2012)
DILL et al. (2008) +1 other reference
        • Waidhaus
Dill et al. (2010) +3 other references
Weiß (1990)
www.berthold-weber.de (2001)
          • Reinhardsrieth
Harald G. Dill and Radek Skoda (2015)
Wittern (2001) +1 other reference
      • Tirschenreuth District
        • Erbendorf
          • Hopfau
Pöllmann et al. (2005)
        • Plößberg
  • Hesse
    • Darmstadt
      • Bergstraße
        • Heppenheim
          • Kirschhausen
Wittern (2001)
      • Main-Taunus-Kreis
        • Eppstein
          • Bremthal
www.mineralienatlas.de (n.d.)
    • Giessen Region
      • Giessen
        • Biebertal
          • Rodheim-Bieber
Weiß (1990)
Palache et al. (1951) +2 other references
      • Lahn-Dill-Kreis
        • Braunfels
in the collection of Christof Schäfer
        • Lahnau
          • Waldgirmes
Dana 6: 797 +1 other reference
      • Limburg-Weilburg
        • Weilmünster
          • Essershausen
Müller et al. (2012)
        • Weinbach
Blaß (2002)
    • Main-Taunus-Kreis
      • Eppstein
        • Bremthal
Dana 6:823.
  • North Rhine-Westphalia
    • Arnsberg
      • Hochsauerlandkreis
        • Arnsberg
          • Uentrop
Weiß (1990)
        • Bestwig
Blaß et al. (1998) +1 other reference
        • Sundern
          • Hellefeld
Wittern (2001)
      • Siegen-Wittgenstein
        • Siegen
          • Alt-Siegen
            • Achenbach
Legner et al. (2011)
      • Soest
        • Warstein
D. Pawlowski: "Mineralfundstellen im Sauerland" (Munich) +1 other reference
    • Düsseldorf
      • Wuppertal
        • Aprath castle
Emser Hefte 1988 (4)
  • Rhineland-Palatinate
    • Rhein-Lahn-Kreis
      • Aar-Einrich
        • Mudershausen
www.mineralienatlas.de (2016)
  • Saxony-Anhalt
    • Harz
      • Oberharz am Brocken
        • Trautenstein
Gröbner et al. (2011)
    • Mansfeld-Südharz
      • Südharz
        • Stolberg
          • Großer Auerberg
Gröbner et al. (2011)
  • Saxony
    • Görlitz District
      • Rengersdorf
Witzke et al. (1997)
    • Vogtlandkreis
      • Heinsdorfergrund
        • Hauptmannsgrün
Pestel et al. (2012)
  • Thuringia
    • Nordhausen District
      • Harztor
        • Herrmannsacker
          • Lange Tal
            • Neustadt dam
Gröbner et al. (2011)
    • Saale-Orla District
      • Hirschberg
        • Ullersreuth
T. Witzke et al.: Lapis 2001 (12)
Lapis (12)
Hungary
 
  • Borsod-Abaúj-Zemplén County
    • Miskolc District
      • Bükkszentkereszt
collector: Regina Körmendy
Iran
 
  • West Azerbaijan Province
    • Takab County
Daliran (2008)
Italy
 
  • Apulia
    • Metropolitan City of Bari
      • Castellana Grotte
Balenzano et al. (1974)
  • Liguria
    • Savona Province
      • Vado Ligure
Marco Ciriotti 2010
Balestra C. (2009)
  • Sardinia
    • Metropolitan City of Cagliari
      • Sarroch
Orlandi et al. (2013) +1 other reference
    • South Sardinia Province
      • Carbonia
        • Barbusi
Baldoni et al. (2013) +2 other references
      • Gonnosfanadiga
        • Fenugu Sibiri Mine
Brizzi et al. (1994)
  • Tuscany
    • Lucca Province
      • Pietrasanta
        • Valdicastello Carducci
Senesi F. (Valdicastello Carducci, Lucca)
Japan
 
  • Ibaraki Prefecture
    • Kasumigaura City
      • Chiyoda-machi
pers. comm. Kotaro Watanabe
  • Kyoto Prefecture
    • Soraku District
      • Wazuka-cho
MORIMITSU et al. (2021)
  • Nagano Prefecture
    • Chino City
- (n.d.) +1 other reference
Liberia
 
  • Bomi County
Axelrod et al. (1952)
  • Gbarpolu County
    • Bopolu
a reconnaissance report. USGS Bulletin ... +2 other references
Madagascar
 
  • Amoron'i Mania
    • Ambatofinandrahana District
      • Mandrosonoro
Behier (1963)
Malaysia
 
  • Johor
    • Batu Pahat District
- (n.d.)
  • Sarawak
    • Miri Division
Bridge et al. (1983)
Mali
 
  • Sikasso Region
    • Kadiolo Cercle
Cedrick Gineste
Mexico
 
  • Durango
    • Indé Municipality
Michael Shannon specimens
Morocco
 
  • Drâa-Tafilalet Region
    • Ouarzazate Province
      • Amerzgane Cercle
        • Ouisselsate Caïdat
WALENTA (1981)
Namibia
 
  • Erongo Region
    • Dâures Constituency
von Bezing (2007)
Der Aufschluss 36:117-119
Portugal
 
  • Braga
    • Braga
      • Mire de Tibães
Nunes (n.d.)
  • Bragança
    • Torre de Moncorvo
      • Carviçais
      • Felgar e Souto da Velha
various correctly added photos
Alves (n.d.)
Alves (n.d.)
  • Castelo Branco
    • Idanha-a-Nova
      • União de Freguesias de Monsanto e Idanha-a-Velha
Neiva et al. (2000)
Pedro Alves collection and/or ...
  • Coimbra
    • Góis
      • Cadafaz e Colmeal
Analyzed SEM-EDS by Pedro Alves
  • Évora
    • Vila Viçosa
      • Nossa Senhora da Conceição e São Bartolomeu
  • Guarda
    • Gouveia
      • Folgosinho
Alves (n.d.)
    • Guarda
      • Vela
Alves (n.d.)
    • Sabugal
      • Bendada
Schnorrer-Köhler (1991)
Alves (n.d.)
  • Viana do Castelo
    • Caminha
      • Arga de Baixo
    • Ponte da Barca
      • Touvedo (São Lourenço e Salvador)
Self-collected by Pedro Alves.
    • Ponte de Lima
      • Cabração e Moreira do Lima
Alves (n.d.)
        • Moreira do Lima
    • Vila Nova de Cerveira
      • Covas
Alves (n.d.)
  • Viseu
    • Mangualde
      • Mangualde (Mesquitela e Cunha Alta)
Palache et al. (1951)
Pedro Alves collection (p-XRD and SEM EDS analysed samples) +1 other reference
Mineralien Atlas
    • São João da Pesqueira
Neiva et al. (2000)
    • São Pedro do Sul
      • Manhouce
Alves (n.d.)
    • Sátão
      • Ferreira de Aves
        • Aldeia Nova
Rui Nunes 2010
    • Vila Nova de Paiva
Identified in Rebentão Mine
      • Queiriga
        • Lagares do Estanho Mines
self-find
Romania
 
  • Maramureș County
    • Târgu Lăpuș
minerals-of-the-carpathians.eu (2008) +1 other reference
Russia
 
  • Kamchatka Krai
    • Ust-Bolsheretsky District
Rychagov et al. (2017, November)
  • Murmansk Oblast
    • Kovdorsky District
Ivanyuk et al. (2018)
  • Sakha
    • Indigirka River Basin
      • Ust'-Nera
Gamyanin et al. (2014)
Rwanda
 
  • Western Province
    • Ngororero District
      • Muhororo
von Knorring et al. (1982) +1 other reference
Bertossa
Senegal
 
  • Kédougou Region
    • Saraya
Slovakia
 
  • Banská Bystrica Region
    • Banská Štiavnica District
      • Banská Štiavnica
Martin Števko-unpublished
South Africa
 
  • Gauteng
    • West Rand District Municipality
      • Far West Rand
        • Oberholzer
Martini (1978)
Cairncross et al. (1995)
        • Western Sector
          • Carletonville
Martini (1978)
  • Limpopo
    • Waterberg District Municipality
      • Mogalakwena Local Municipality
        • Mokopane
Martini (1978)
      • Thabazimbi Local Municipality
        • Thabazimbi
          • Glenover carbonatite
Cairncross et al. (1995)
  • Mpumalanga
    • Ehlanzeni District Municipality
      • Mbombela Local Municipality
        • Mbombela
Martini (1997)
  • North West
    • Dr Kenneth Kaunda District Municipality
      • JB Marks Local Municipality
        • Ventersdorp
Martini (1978) +1 other reference
  • Northern Cape
    • Namakwa District Municipality
      • Nama Khoi Local Municipality
        • Steinkopf
Cairncross et al. (1995)
    • ZF Mgcawu District Municipality
      • Kai !Garib Local Municipality
        • Kenhardt
Cairncross et al. (1995)
  • Western Cape
    • West Coast District Municipality
Cairncross et al. (1995)
South Korea
 
  • North Jeolla Province
    • Jangsu County
      • Kyenae-myon
Kinosaki (1940)
Spain
 
  • Castile-La Mancha
    • Ciudad Real
      • Almodóvar del Campo
Sáinz de Baranda et al. (2004)
www.foro-minerales.com (2022) +1 other reference
  • Castile and Leon
    • Salamanca
      • Garcirrey
Christian Rewitzer collection
    • Zamora
      • San Vicente de la Cabeza
Moro et al. (1995)
  • Catalonia
    • Barcelona
      • Baix Llobregat
F. Costa et al.
          • Bruguers
Joan Rosell (2023)
Bareche (2005)
      • Vallès Occidental
        • Montcada i Reixac
Mineralogistes de Catalunya (1997)
  • Extremadura
      • Zarza la Mayor
Viñals et al. (2011)
  • Galicia
    • A Coruña
      • Arteixo
Miguel Calvo Rebollar (2015)
    • Pontevedra
      • Gondomar
        • Vincios
          • Galiñeiro Complex
NÚÑEZ-GARCÍA et al. (2012) +1 other reference
      • Tomiño
Calvo Rebollar (2015)
Sweden
 
  • Norrbotten County
    • Kiruna
      • Kiruna Town Mining District
Palache et al. (1951)
      • Svappavaara
Bjällerud (1989) +1 other reference
UK
 
  • England
    • Cornwall
      • Calstock
        • Drakewalls
Craik-Smith (2000)
      • Linkinhorne
        • Minions
Golley et al. (1995)
      • Perranzabuloe
        • Perran Iron Lode (Great Perran Iron Lode)
Golley et al. (1995)
    • Cumbria
      • Allerdale
        • Caldbeck
          • Coombe Height
Hartley (1984) +2 other references
Stanley et al. (1991)
      • Eden
        • Mungrisdale
Cooper et al. (1990) +1 other reference
Cooper et al. (1990)
    • Devon
      • North Devon
        • Bishop's Tawton
Alysson Rowan collection
Uruguay
 
  • Lavalleja Department
    • Minas
Eckel et al. (1953)
USA
 
  • Alabama
    • Calhoun County
      • Jacksonville
Barwood et al. (1978) +1 other reference
King et al. (1995)
    • Cherokee County
Henry Barwood
Rocks & Min.: 64:203. +1 other reference
Cook et al. (1982)
      • Rock Run
        • Wolfden Mountain
Dean (1995)
Dean (1995)
    • Shelby County
      • Alabaster
chris bryant +1 other reference
  • Arizona
    • Yavapai County
      • Eureka Mining District
        • Hillside
          • Bagdad Mine area
Dunn et al. (1984) +1 other reference
Jahns (1952) +1 other reference
        • Independence Gulch
Jahns (1952)
Jahns (1952)
  • Arkansas
    • Garland County
      • Wilson Springs (Potash Sulfur Springs)
        • Union Carbide Mine
Howard +1 other reference
    • Polk County
Smith (1988)
      • Shady
Rocks & Min.:64:297-298.
Am Min 51:1811-1814
Smith (1988)
      • Three Oak Gap
Smith (1988)
  • California
    • Amador County
      • Jackson-Plymouth Mining District
        • Martell
Van Nostrand Reinholt Press: 311. +3 other references
    • El Dorado County
      • Slate Mountains
        • Slate Mountain District
          • Slate Mountain
www.mineralsocal.org
    • San Diego County
      • Jacumba
        • Tule Mountain (Mount Tule; Tulley Mountain)
Fisher (2002)
      • Pala Mining District
        • Pala
Jahns et al. (1951)
Seaman (1976)
  • Colorado
    • Custer County
Eckel et al. (1997)
Eckel et al. (1997)
    • Teller County
      • Cripple Creek Mining District
Carnein et al. (2005)
  • Connecticut
    • Hartford County
      • Glastonbury
        • East Glastonbury
Rocks & Min.: 70:398
  • Florida
    • Polk County
      • Central Florida Phosphate Mining District (Bone Valley)
        • Homeland
Denicourt +1 other reference
        • Noralyn/Phosphoria Mines (IMC-Agrico)
Marc V. Hurst (2012)
  • Georgia
    • Bartow County
      • Iron Hill Mining District
Rocks & Min.:64:185 +1 other reference
    • Burke County
      • Girard District
Jason Smith & M.E. Ciriotti (2005)
    • Lincoln County
Barwood et al. (1999)
    • Polk County
      • Cedartown
Rocks & Min.: 64:203.
Rocks & Minerals 54:4 pp161-165
  • Idaho
    • Latah County
      • Avon Mining District (Mica Mountain Mining District)
Ream (2004)
  • Indiana
    • Pike County
Simmons et al. (1984)
www. Rogers Minerals.com
  • Maine
    • Oxford County
      • Greenwood
        • Uncle Tom Mountain
Falster et al. (2019)
      • Newry
King et al. (1994) +1 other reference
      • Paris
Found during ongoing study of Ryerson ... +1 other reference
  • Nevada
    • Esmeralda County
      • Candelaria Mining District (Columbus Mining District)
Castor et al. (2004)
      • Gilbert Mining District
Excalibur Mineral Corporation specimens.
    • Eureka County
      • Carlin Trend
        • Maggie Creek Mining Subdistrict
Jensen et al. (1995)
      • Lynn Mining District
        • Elko
Jensen et al. (1995)
Castor et al. (2004)
    • Humboldt County
      • Iron Point Mining District
        • Valmy
Dr. William S. Wise presentation to ... +1 other reference
    • Lyon County
      • Singatse Range
        • Yerington Mining District
In the collection of Brent Thorne. ...
          • Yerington
Pullman
      • Wellington Hills
        • Silver Glance Mining District (Wellington Mining District)
MarekC pers. coll. 2015
    • Nye County
      • Toquima Range
Palache et al. (1951)
Castor et al. (2004)
          • Manhattan
            • Mustang Hill
Castor et al. (2004)
Kleinhampl et al. (1984) +1 other reference
Castor et al. (2004)
        • Northumberland Mining District
MinRec 16 (1)
    • Pershing County
      • Willard Mining District
Jensen et al. (2001)
  • New Hampshire
    • Cheshire County
      • Alstead
Smith (2005)
American Mineralogist 50:1698–1707 +1 other reference
    • Grafton County
      • Groton
Smith (2005) +1 other reference
Palache et al. (1951) +2 other references
Rocks & Min. +2 other references
      • Orange
Thompson et al. (2022)
    • Strafford County
      • Strafford
        • Parker Mountain
Rocks & Minerals 80:4 pp234-241 +1 other reference
  • New Jersey
    • Gloucester County
      • Harrison Township
Henderson (1980)
Locality description: "[...] all the ...
  • New Mexico
    • Doña Ana County
      • Organ Mountains
        • Organ Mining District
Jerry Cone Collection
    • Grant County
      • Burro Mountains Mining District
        • Tyrone Area
D.Court collection +1 other reference
Jerry Cone Collection
  • North Carolina
    • Alamance County
      • Snow Camp
Jason B. Smith collection
    • Cleveland County
      • Kings Mountain
Horton et al. (1981) +1 other reference
    • Gaston County
    • Orange County
      • Hillsborough
www.mindat.org/mesg-11-168140.html
  • Pennsylvania
    • Cumberland County
      • Mount Holly Springs
Palache et al. (1951) +1 other reference
    • Lancaster County
      • Salisbury Township
        • Gap
Palache et al. (1951)
    • Northampton County
      • Lower Saucon Township
        • Hellertown
Montgomery (1969)
  • South Carolina
    • Cherokee County
      • Kings Creek Mining District
        • Kings Creek Mine
Rocks & Minerals 54:4 pp173-175
  • South Dakota
    • Custer County
      • Custer Mining District
        • Custer
Peacor (1969) +1 other reference
Loomis (2011)
        • Fourmile
Rocks & Minerals: 60: 117. +1 other reference
        • Pringle
          • Cicero Peak
Julius Weber collection
    • Pennington County
      • Keystone Mining District
Smith et al. (2000)
        • Keystone
Peacor et al. (1984)
Rocks & Minerals: 67 (6)
      • Unorganized mining district [5]
King (n.d.)
  • Tennessee
    • Cocke County
      • Del Rio Mining District
Lehnert (1971)
    • Wayne County
      • Iron City
Paris (2011)
  • Utah
    • Box Elder County
      • Utahlite Hill
J. Marty (1995)
  • Virginia
    • Amelia County
      • Winterham
Kearns et al. (2000)
    • Nelson County
Dietrich (1990)
    • Rockbridge County
      • Lyndhurst-Vesuvius Mining District
Watson (1907) +1 other reference
      • Midvale
        • South Mountain
Rocks & Minerals: 57: 20 +2 other references
Zimbabwe
 
  • Mashonaland West
    • Karoi District
Gallagher (1967)
Mars
 
  • Aeolis quadrangle
    • Gale Crater
      • Aeolis Mons (Mount Sharp)
        • Lower Mt. Sharp
          • Glen Torridon
Treiman et al. (2023)
    • Gusev Crater
      • Columbia Hills
        • Husband Hill
          • Cumberland Ridge
Lane et al. (2008)
 
and/or  
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