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Evansite

A valid IMA mineral species - grandfathered
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About EvansiteHide

Formula:
Al3(PO4)(OH)6 · 6H2O
Colour:
Colourless, milk-white, lightly tinted blue, green or yellow at times; brown, reddish-brown, or red due to FeO inclusions; colourless to brown in transmitted light
Lustre:
Vitreous, Resinous, Waxy
Hardness:
3½ - 4
Specific Gravity:
1.8 - 2.2
Crystal System:
Amorphous
Name:
For British metallurgist, Brooke Evans (1797-1862), Birmingham, England, who brought the first specimens from Hungary in 1855.
A secondary amorphous mineral commonly occurring with limonite and allophane.
Needs modern reinvestigation.


Unique IdentifiersHide

Mindat ID:
1426
Long-form identifier:
mindat:1:1:1426:3
GUID
(UUID V4):
9158955e-797b-40e6-9eef-6f4430115f38

IMA Classification of EvansiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Al3(PO4)(OH)6 · 8H2O
First published:
1864

Classification of EvansiteHide

8.DF.10

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
F : With only medium-sized cations, (OH,etc.):RO4 > 3:1
42.1.2.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
1 : A3(XO4)Zq·xH2O
19.7.9

19 : Phosphates
7 : Phosphates of Al 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
EvnIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of EvansiteHide

Vitreous, Resinous, Waxy
Transparency:
Transparent, Translucent
Comment:
Lustre inclines toward resinous or waxy.
Colour:
Colourless, milk-white, lightly tinted blue, green or yellow at times; brown, reddish-brown, or red due to FeO inclusions; colourless to brown in transmitted light
Streak:
White; lightly tinted.
Hardness:
3½ - 4 on Mohs scale
Tenacity:
Very brittle
Fracture:
Conchoidal
Density:
1.8 - 2.2 g/cm3 (Measured)    
Comment:
Density usually about 1.9.

Optical Data of EvansiteHide

Type:
Isotropic
RI values:
n = 1.445 - 1.485
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate

Chemistry of EvansiteHide

Mindat Formula:
Al3(PO4)(OH)6 · 6H2O
Common Impurities:
Cu,Pb

Crystallography of EvansiteHide

Crystal System:
Amorphous
Morphology:
Botryoidal or reniform coatings; concentric, colloform structure at times; opaline; stalactitic. Massive.
Comment:
Amorphous. Point Group: n.d.; Space Group: n.d. Z = n.d.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
- Å()
Comments:
Amorphous to X-rays.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47c : [Carbonates, phosphates, borates, nitrates]
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
50 : Coal and/or oil shale minerals<0.36
52 : Guano- and urine-derived minerals<0.4

Type Occurrence of EvansiteHide

General Appearance of Type Material:
Incrustations in cavities in limonite. Small reniform or globular stalactites; pearl-like.
Place of Conservation of Type Material:
Narodni Museum, Prague, Czech Republic, 1935-26572; Harvard University, Cambridge, Massachusetts, USA, 110880.
Associated Minerals at Type Locality:
Reference:
Forbes, D. (1864) On evansite, a new mineral species. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: 28: 341-346.

Other Language Names for EvansiteHide

German:Evansit
Spanish:Evansita

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Evansite associated with DoyleiteAl(OH)3
5 photos of Evansite associated with ChalcanthiteCuSO4 · 5H2O
4 photos of Evansite associated with VashegyiteAl11(PO4)9(OH)6 · 38H2O
2 photos of Evansite associated with MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
2 photos of Evansite associated with AntleriteCu3(SO4)(OH)4
2 photos of Evansite associated with Shungite (1)
1 photo of Evansite associated with PyriteFeS2
1 photo of Evansite associated with CuretoniteBa(Al,Ti)(PO4)(OH,O)F
1 photo of Evansite associated with VolborthiteCu3(V2O7)(OH)2 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

8.DF.KernowiteCu2Fe(AsO4)(OH)4 · 4H2OMon.
8.DF.WiperamingaiteNaCaFe3+Al(PO4)F5(OH) · H2OOrth. 2 2 2 : P21 21 21
8.DF.05HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2OTric.
8.DF.10BolivariteAl2(PO4)(OH)3 · 4-5H2OAmor.
8.DF.10Liskeardite[(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2OMon.
8.DF.10Rosièresite(Pb, Cu, Al, P, O, H)Amor.
8.DF.15Rusakovite(Fe3+,Al)5(VO4,PO4)2(OH)9 · 3H2O
8.DF.20LiroconiteCu2Al(AsO4)(OH)4 · 4H2OMon. 2/m
8.DF.25SieleckiiteCu3Al4(PO4)2(OH)12 · 2H2OMon. 2/m : B2/m
8.DF.30ChalcophylliteCu18Al2(AsO4)4(SO4)3(OH)24 · 36H2OTrig. 3 : R3
8.DF.35ParnauiteCu9(AsO4)2(SO4)(OH)10 · 7H2OOrth. mm2 : Pmn21
8.DF.40GladiusiteFe2(Fe,Mg)4(PO4)(OH)11(H2O)Mon. 2/m
8.DF.50ForêtiteCu2Al2(AsO4)(OH,O,H2O)6 Tric. 1 : P1

Fluorescence of EvansiteHide

May fluoresce bright green under SW and LW UV, probably due to trace uranium.

Other InformationHide

Notes:
Readily soluble in acids.
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 EvansiteHide

References for EvansiteHide

Reference List:

Localities for EvansiteHide

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
 
  • South Australia
    • Mt Lofty Ranges
      • North Mt Lofty Ranges
        • Kapunda
  • Tasmania
    • West Coast municipality
      • Zeehan mining district
        • Zeehan mineral field
Austria
 
  • Salzburg
    • Zell am See District
      • Lend
Belgium
 
  • Wallonia
    • Hainaut
      • Bernissart
        • Blaton
    • Liège
Bolivia
 
  • Potosí
    • Rafael Bustillo Province
      • Llallagua
China
 
  • Guizhou
    • Zunyi
      • Bozhou District
        • Zunyi Ni-Mo-PGE-Au ore field
  • Hunan
    • Zhangjiajie
      • Cili Co.
  • Yunnan
    • Kunming
      • Dongchuan District
    • Qujing
      • Zhanyi District
Czech Republic
 
  • Pardubice Region
    • Pardubice District
  • South Bohemian Region
    • Český Krumlov District
      • Český Krumlov
        • Domoradice
  • South Moravian Region
    • Blansko District
  • Vysočina Region
    • Žďár nad Sázavou District
      • Štěpánov nad Svratkou
DR Congo
 
  • South Kivu
    • Shabunda Territory
France
 
  • Bourgogne-Franche-Comté
    • Saône-et-Loire
      • Charolles
        • Chalmoux
  • Grand Est
    • Marne
      • Épernay
        • Épernay
  • Pays de la Loire
    • Loire-Atlantique
      • Châteaubriant-Ancenis
        • Saint-Aubin-des-Châteaux
Germany
 
  • North Rhine-Westphalia
    • Düsseldorf
      • Wuppertal
        • Aprath castle
Hungary
 
  • Borsod-Abaúj-Zemplén County
    • Kazincbarcika District
      • Dédestapolcsány
Israel
 
  • Haifa District
    • Hof HaCarmel
Japan
 
  • Miyazaki Prefecture
    • Nishiusuki District
      • Hinokage
Kazakhstan
 
  • Jambyl Region
    • Talas Alatau Range (Talas Ala-Too Range)
Madagascar
 
  • Atsinanana
    • Vatomandry District
  • Vakinankaratra
Portugal
 
  • Porto
  • Viana do Castelo
    • Caminha
    • Ponte de Lima
      • Cabração e Moreira do Lima
Romania
 
  • Alba County
    • Roșia Montană
  • Suceava County
    • Iacobeni
Russia
 
  • Stavropol Krai
    • Pyatigorsk
      • Lermontovskoe U Deposit
        • Beshtau Mountain
          • Mine no. 1
Slovakia
 
  • Banská Bystrica Region
    • Banská Bystrica District
      • Ľubietová
      • Špania Dolina
    • Revúca District
      • Sirk
    • Rimavská Sobota District
      • Vyšný Skálnik
  • Košice Region
    • Rožňava District
      • Betliar
      • Ochtiná
South Africa
 
  • Gauteng
    • West Rand District Municipality
      • Far West Rand
        • Western Sector
          • Carletonville
      • Mogale City Local Municipality
        • Krugersdorp
  • North West
    • Dr Kenneth Kaunda District Municipality
      • JB Marks Local Municipality
        • Potchefstroom
        • Ventersdorp
Spain
 
  • Catalonia
    • Barcelona
      • Baix Llobregat
        • Gavà
          • Bruguers
        • Sant Feliu de Llobregat
          • Collserola mountain range
            • Santa Creu d'Olorda
      • Barcelonès
        • Barcelona city
          • Collserola mountain range
      • Vallès Occidental
        • Montcada i Reixac
  • Galicia
    • Pontevedra
      • Vigo
  • Navarre
    • Esteríbar
      • Eugui
UK
 
  • England
    • Cheshire
      • Macclesfield
    • Devon
      • North Devon
        • West Buckland
USA
 
  • Alabama
    • Shelby County
      • Coosa coal field
  • Arkansas
    • Garland County
      • Wilson Springs (Potash Sulfur Springs)
        • Union Carbide Mine
  • Idaho
    • Custer County
  • Maine
    • Oxford County
      • Paris
  • Nevada
    • Humboldt County
      • Osgood Mountains
        • Potosi Mining District
  • Wisconsin
    • Dodge County
      • Iron Ridge Mining District (Neda Iron Mining District)
Venezuela
 
 
Mineral and/or Locality  
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