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Paracoquimbite

A valid IMA mineral species - grandfathered
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About ParacoquimbiteHide

Formula:
Fe4(SO4)6(H2O)12 · 6H2O
Formerly given as Fe2(SO4)3.9H2O; changed to better address its homeotypic relation to coquimbite. The current formula is just a multiplication of the former one.
Colour:
Pale violet
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.11
Crystal System:
Trigonal
Name:
From the Greek "para" for near and its relation to Coquimbite.
Note: Al is not essential in paracoquimbite (but is essential in coquimbite), as derived from the IMA redefinition.




Unique IdentifiersHide

Mindat ID:
3084
Long-form identifier:
mindat:1:1:3084:3
GUID
(UUID V4):
fbbce05e-40e5-49e0-adb9-d53e98470334

IMA Classification of ParacoquimbiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Fe3+4(SO4)6(H2O)12 · 6H2O
Approval history:
redefinition code: IMA-19F

Classification of ParacoquimbiteHide

7.CB.55

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations
29.8.4.1

29 : HYDRATED ACID AND NORMAL SULFATES
8 : A2(XO4)3·H2O
25.10.10

25 : Sulphates
10 : Sulphates 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.

SymbolSourceReference
PcoqIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of ParacoquimbiteHide

Vitreous
Transparency:
Transparent
Colour:
Pale violet
Hardness:
2½ on Mohs scale
Cleavage:
Imperfect/Fair
On {0112} and {10
14}, imperfect.
Density:
2.11(1) g/cm3 (Measured)    2.115 g/cm3 (Calculated)

Optical Data of ParacoquimbiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.550(2) nε = 1.555(2)
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemistry of ParacoquimbiteHide

Mindat Formula:
Fe4(SO4)6(H2O)12 · 6H2O

Formerly given as Fe2(SO4)3.9H2O; changed to better address its homeotypic relation to coquimbite. The current formula is just a multiplication of the former one.

Crystallography of ParacoquimbiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 10.926(9) Å, c = 51.3(21) Å
Ratio:
a:c = 1 : 4.695
Unit Cell V:
5,303.60 ų (Calculated from Unit Cell)
Z:
12
Morphology:
Crystals rhombohedral, frequently with large {0112}; also equant, pseudo-cubic, with large {0001} and {0112}, or prismatic [0001]. massive, granular.
Twinning:
On {0001}, common.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000261ParacoquimbiteRobinson P D, Fang J H (1971) Crystal structures and mineral chemistry of hydrated ferric sulphates: II. The crystal structure of paracoquimbite American Mineralogist 56 1567-157219710293
CIF Raw Data - click here to close

Epitaxial Relationships of ParacoquimbiteHide

Epitaxial Minerals:
CoquimbiteAlFe3(SO4)6(H2O)12 · 6H2O
Epitaxy Comments:
Coquimbite in parallel position; contact surface {0001}. As scepter-like overgrowths.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.88 Å(100)
8.55 Å(20)
7.62 Å(39)
5.465 Å(29)
4.713 Å(16)
4.605 Å(29)
3.367 Å(33)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
46 : Near-surface hydrothermal alteration of minerals (see also #22)
47a : [Near-surface hydration of prior minerals]
47b : [Sulfates and sulfites]
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
50 : Coal and/or oil shale minerals<0.36
Geological Setting:
Oxidation zone in pyrite deposits - especially in arid regions.

Type Occurrence of ParacoquimbiteHide

Other Language Names for ParacoquimbiteHide

Relationship of Paracoquimbite to other SpeciesHide

Other Members of this group:
AluminocoquimbiteAl2Fe2(SO4)6(H2O)12 · 6H2OTrig. 3m (3 2/m) : P3 1c
CoquimbiteAlFe3(SO4)6(H2O)12 · 6H2OTrig. 3m (3 2/m) : P3 1c

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Paracoquimbite associated with MetavoltineK2Na6Fe2+Fe3+6O2(SO4)12 · 18H2O
5 photos of Paracoquimbite associated with CoquimbiteAlFe3(SO4)6(H2O)12 · 6H2O
1 photo of Paracoquimbite associated with FluoriteCaF2
1 photo of Paracoquimbite associated with JarositeKFe3+3(SO4)2(OH)6
1 photo of Paracoquimbite associated with KorneliteFe2(SO4)3 · 7H2O
1 photo of Paracoquimbite associated with RömeriteFe2+Fe3+2(SO4)4 · 14H2O
1 photo of Paracoquimbite associated with LauseniteFe2(SO4)3 · 5H2O
1 photo of Paracoquimbite associated with PickeringiteMgAl2(SO4)4 · 22H2O
1 photo of Paracoquimbite associated with AluminocopiapiteAl2/3Fe3+4(SO4)6(OH)2 · 20H2O
1 photo of Paracoquimbite associated with CopiapiteFe2+Fe3+4(SO4)6(OH)2 · 20H2O

Related Minerals - Strunz-mindat GroupingHide

7.CB.SarvodaiteAl2(SO4)3 · 5H2O Mon. 2/m : P21/m
7.CB.02VoudourisiteCdSO4 · H2OMon. 2/m : P21/m
7.CB.05DwornikiteNi(SO4) · H2OMon. 2/m : B2/b
7.CB.05GunningiteZnSO4 · H2OMon. 2/m : B2/b
7.CB.05KieseriteMgSO4 · H2OMon. 2/m : B2/b
7.CB.05Poitevinite(Cu,Fe)SO4 · H2OTric. 1 : P1
7.CB.05SzmikiteMnSO4 · H2OMon. 2/m : B2/b
7.CB.05SzomolnokiteFeSO4 · H2OMon. 2/m : B2/b
7.CB.05CobaltkieseriteCoSO4 · H2OMon. 2/m : B2/b
7.CB.07SanderiteMgSO4 · 2H2OOrth. 2 2 2 : P21 21 21
7.CB.10BonattiteCuSO4 · 3H2OMon. m : Bb
7.CB.12BelogubiteCuZn(SO4)2 · 10H2OTric. 1 : P1
7.CB.15Aplowite(Co,Mn,Ni)SO4 · 4H2OMon. 2/m
7.CB.15Boyleite(Zn,Mg)SO4 · 4H2OMon. 2/m : P21/b
7.CB.15Ilesite(Mn,Zn,Fe)SO4 · 4H2OMon. 2/m
7.CB.15RozeniteFeSO4 · 4H2OMon. 2/m : P21/b
7.CB.15StarkeyiteMgSO4 · 4H2OMon. 2/m : P21/b
7.CB.15DrobeciteCdSO4 · 4H2OMon. 2/m : P21/m
7.CB.15CranswickiteMgSO4 · 4H2OMon. m : Bb
7.CB.20ChalcanthiteCuSO4 · 5H2OTric. 1 : P1
7.CB.20JÎkokuiteMnSO4 · 5H2OTric. 1 : P1
7.CB.20PentahydriteMgSO4 · 5H2OTric. 1 : P1
7.CB.20SiderotilFeSO4 · 5H2OTric.
7.CB.25BianchiteZn(SO4) · 6H2OMon. 2/m : P2/m
7.CB.25ChvaleticeiteMn(SO4) · 6H2OMon. 2/m : B2/b
7.CB.25FerrohexahydriteFeSO4 · 6H2OMon. 2/m : B2/b
7.CB.25HexahydriteMgSO4 · 6H2OMon. 2/m : P2/m
7.CB.25MoorhouseiteCo(SO4) · 6H2OMon. 2/m : B2/b
7.CB.25NickelhexahydriteNi(SO4) · 6H2OMon. 2/m : B2/b
7.CB.30RetgersiteNiSO4 · 6H2OTet. 4 2 2 : P41 21 2
7.CB.35BieberiteCoSO4 · 7H2OMon. 2/m : P2/m
7.CB.35BoothiteCuSO4 · 7H2OMon. 2/m : P21/b
7.CB.35MallarditeMnSO4 · 7H2OMon. 2/m : P2/m
7.CB.35MelanteriteFe2+(H2O)6SO4 · H2OMon. 2/m : P21/b
7.CB.35Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2OMon. 2/m : P21/b
7.CB.35Alpersite(Mg,Cu)(SO4) · 7H2OMon. 2/m : P21/b
7.CB.40EpsomiteMgSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.40GoslariteZnSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.40MorenositeNiSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.45AlunogenAl2(SO4)3 · 17H2OTric. 1 : P1
7.CB.45Meta-alunogenAl2(SO4)3 · 12H2OOrth.
7.CB.50AluminocoquimbiteAl2Fe2(SO4)6(H2O)12 · 6H2OTrig. 3m (3 2/m) : P3 1c
7.CB.50Lazaridisite3CdSO4 · 8H2OMon. 2/m : B2/b
7.CB.52PararaisaiteCuMg[Te6+O4(OH)2] · 6H2OMon. 2/m : P21/b
7.CB.55CoquimbiteAlFe3(SO4)6(H2O)12 · 6H2OTrig. 3m (3 2/m) : P3 1c
7.CB.55Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
7.CB.55RaisaiteCuMg[Te6+O4(OH)2] · 6H2OMon. 2/m : B2/b
7.CB.57CaichengyuniteFe2+3Al2(SO4)6 · 30H2OMon.
7.CB.60KorneliteFe2(SO4)3 · 7H2OMon. 2/m : P21/m
7.CB.65QuenstedtiteFe2(SO4)3 · 11H2OTric. 1 : P1
7.CB.70LauseniteFe2(SO4)3 · 5H2OMon. 2/m : P21/m
7.CB.75LishizheniteZnFe2(SO4)4 · 14H2OTric. 1 : P1
7.CB.75RömeriteFe2+Fe3+2(SO4)4 · 14H2OTric. 1 : P1
7.CB.80RansomiteCuFe2(SO4)4 · 6H2OMon. 2/m : P21/b
7.CB.85ApjohniteMn2+Al2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85BíliniteFe2+Fe3+2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85HalotrichiteFeAl2(SO4)4 · 22H2OMon. 2 : P2
7.CB.85PickeringiteMgAl2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4 · 22H2OMon. 2
7.CB.85Wupatkiite(Co,Mg,Ni)Al2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.90MeridianiiteMgSO4 · 11H2OTric. 1 : P1

Other InformationHide

Notes:
Soluble in water , astringent.
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 ParacoquimbiteHide

References for ParacoquimbiteHide

Reference List:

Localities for ParacoquimbiteHide

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.
Australia
 
  • Tasmania
    • West Coast municipality
      • Zeehan mining district
        • Mt Heemskirk mineral field
Austria
 
  • Lower Austria
    • Horn District
      • Drosendorf-Zissersdorf
        • Wollmersdorf (Zettlitz-Wollmersdorf)
Canada
 
  • Nova Scotia
    • Cape Breton Co.
  • QuĂ©bec
    • MontĂ©rĂ©gie
      • La VallĂ©e-du-Richelieu RCM
        • Mont Saint-Hilaire
Chile (TL)
 
  • Antofagasta
    • Antofagasta Province
      • Sierra Gorda
    • El Loa Province
      • Calama
        • Chuquicamata District
          • Toki Cu deposit (Toki Cluster)
  • Atacama
    • CopiapĂł Province
China
 
  • Xinjiang
    • Hami Prefecture (Kumul Prefecture; Qumul Prefecture)
      • Yizhou District
France
 
  • Brittany
    • Morbihan
      • Pontivy
        • Guern
  • Grand Est
    • Haut-Rhin
      • Colmar-RibeauvillĂ©
  • Provence-Alpes-CĂŽte d'Azur
      • Draguignan
        • Tanneron
Germany
 
  • Baden-WĂŒrttemberg
    • Freiburg Region
      • Waldshut
        • St Blasien
          • Menzenschwand
  • Saxony
    • Görlitz District
      • Quitzdorf am See
        • Horscha
  • Thuringia
    • Greiz District
      • Ronneburg
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion Mining District
          • Agios Konstantinos (Kamariza)
          • Plaka
            • Plaka Mines
Hungary
 
  • Baranya County
    • PĂ©cs District
Japan
 
  • Oita Prefecture
    • Beppu City
Lebanon
 
  • South Governorate
    • Jezzine District
Portugal
 
  • Beja
    • MĂ©rtola
      • Corte do Pinto
Romania
 
  • Maramureș County
    • Băiuț
South Africa
 
  • Gauteng
    • City of Tshwane Metropolitan Municipality
Spain
 
  • Castile and Leon
    • Segovia
      • SepĂșlveda
        • Villaseca
USA
 
  • Arizona
    • Cochise County
      • Bisbee
        • Calumet and Arizona group of claims (Calumet and Arizona Mining Company group of claims)
  • Georgia
    • Lincoln County
  • Nebraska
    • Jefferson County
      • Fairbury
  • Nevada
    • Washoe County
      • Steamboat Springs Mining District
  • Virginia
    • Louisa County
      • Gold-Pyrite Belt
        • Mineral
    • Rockbridge County
      • Lyndhurst-Vesuvius Mining District
Mars
 
  • Aeolis quadrangle
    • Gusev Crater
      • Columbia Hills
        • Husband Hill
          • Cumberland Ridge
 
Mineral and/or Locality  
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