Evansite
A valid IMA mineral species - grandfathered
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About Evansite
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.
Needs modern reinvestigation.
Unique Identifiers
Mindat ID:
1426
Long-form identifier:
mindat:1:1:1426:3
GUID
(UUID V4):
(UUID V4):
9158955e-797b-40e6-9eef-6f4430115f38
IMA Classification of Evansite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Al3(PO4)(OH)6 · 8H2O
First published:
1864
Classification of Evansite
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
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
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
1 : A3(XO4)Zq·xH2O
19.7.9
19 : Phosphates
7 : Phosphates of Al alone
19 : Phosphates
7 : Phosphates of Al alone
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Evn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Evansite
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 Evansite
Type:
Isotropic
RI values:
n = 1.445 - 1.485
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate
Chemistry of Evansite
Mindat Formula:
Al3(PO4)(OH)6 · 6H2O
Elements listed:
Common Impurities:
Cu,Pb
Crystallography of Evansite
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
- Å | () |
Comments:
Amorphous to X-rays.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest 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 Evansite
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 Evansite
Common Associates
Associated Minerals Based on Photo Data:
7 photos of Evansite associated with Doyleite | Al(OH)3 |
5 photos of Evansite associated with Chalcanthite | CuSO4 · 5H2O |
4 photos of Evansite associated with Vashegyite | Al11(PO4)9(OH)6 · 38H2O |
2 photos of Evansite associated with Montgomeryite | Ca4MgAl4(PO4)6(OH)4 · 12H2O |
2 photos of Evansite associated with Antlerite | Cu3(SO4)(OH)4 |
2 photos of Evansite associated with Shungite (1) | |
1 photo of Evansite associated with Pyrite | FeS2 |
1 photo of Evansite associated with Curetonite | Ba(Al,Ti)(PO4)(OH,O)F |
1 photo of Evansite associated with Volborthite | Cu3(V2O7)(OH)2 · 2H2O |
Related Minerals - Strunz-mindat Grouping
8.DF. | Kernowite | Cu2Fe(AsO4)(OH)4 · 4H2O |
8.DF. | Wiperamingaite | NaCaFe3+Al(PO4)F5(OH) · H2O |
8.DF.05 | Hotsonite | Al11(SO4)3(PO4)2(OH)21 · 16H2O |
8.DF.10 | Bolivarite | Al2(PO4)(OH)3 · 4-5H2O |
8.DF.10 | Liskeardite | [(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2O |
8.DF.10 | Rosièresite | (Pb, Cu, Al, P, O, H) |
8.DF.15 | Rusakovite | (Fe3+,Al)5(VO4,PO4)2(OH)9 · 3H2O |
8.DF.20 | Liroconite | Cu2Al(AsO4)(OH)4 · 4H2O |
8.DF.25 | Sieleckiite | Cu3Al4(PO4)2(OH)12 · 2H2O |
8.DF.30 | Chalcophyllite | Cu18Al2(AsO4)4(SO4)3(OH)24 · 36H2O |
8.DF.35 | Parnauite | Cu9(AsO4)2(SO4)(OH)10 · 7H2O |
8.DF.40 | Gladiusite | Fe2(Fe,Mg)4(PO4)(OH)11(H2O) |
8.DF.50 | Forêtite | Cu2Al2(AsO4)(OH,O,H2O)6 |
Fluorescence of Evansite
May fluoresce bright green under SW and LW UV, probably due to trace uranium.
Other Information
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 Evansite
mindat.org URL:
https://www.mindat.org/min-1426.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Evansite
Reference List:
Localities for Evansite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
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Quick NavTopAbout EvansiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Baoshan, Yunnan, China