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Blakeite

A valid IMA mineral species - grandfathered - questionable
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04571810017271921517915.jpg
William P. Blake
Formula:
Fe3+2[TeO3]3 (?)
Colour:
Brown or dark reddish brown; golden yellow to yellowish brown and brown in transmitted light.
Lustre:
Dull
Hardness:
2 - 3
Name:
Named by Clifford Frondel and Frederick H. Pough in 1944 in honor of William Phipps Blake (1 June 1826, New York City, New York, United States - 22 May 1910, Berkeley, California, United States) geologist, mining consultant, and educator.
This page provides mineralogical data about Blakeite.


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Unique IdentifiersHide

Mindat ID:
693
Long-form identifier:
mindat:1:1:693:0

IMA Classification of BlakeiteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959), Questionable
IMA Formula:
Fe3+2(Te4+O3)3 (?)
First published:
1944
Type description reference:
Frondel, Clifford, Pough, Fred H. (1944) Two new tellurites of iron: mackayite and blakeite. With new data on emmonsite and "durdenite.". American Mineralogist, 29 (5-6) 211-225

Classification of BlakeiteHide

Strunz-mindat (2025):
4.JM.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
M : Tellurites without additional anions, with H2O
Hey's CIM Ref.:
28.3.22

28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites

Mineral SymbolsHide

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

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

Physical Properties of BlakeiteHide

Lustre:
Dull
Transparency:
Transparent
Colour:
Brown or dark reddish brown; golden yellow to yellowish brown and brown in transmitted light.
Streak:
Yellowish brown
Hardness:
2 - 3 on Mohs scale
Tenacity:
Fragile
Comment:
Greater than 3.1

Optical Data of BlakeiteHide

Type:
Isotropic
RI values:
n = 2.16(2)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High

Chemistry of BlakeiteHide

Mindat Formula:
Fe3+2[TeO3]3 (?)
Element Weights:
Element% weight
Te59.955 %
O22.553 %
Fe17.493 %

Calculated from ideal end-member formula.
Elements listed:
Fe, O, Te - search for minerals with similar chemistry

Crystallography of BlakeiteHide

Morphology:
Micro-crystalline crusts, massive.
Comment:
No Data is available

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47e : [Vanadates, chromates, manganates]
47h : [Near-surface oxidized, dehydrated minerals]

Type Occurrence of BlakeiteHide

Other Language Names for BlakeiteHide

Dutch:Blakeiet
German:Blakeit
Spanish:Blakeita

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Blakeite associated with MackayiteFe3+(Te4+2O5)(OH)
2 photos of Blakeite associated with PyriteFeS2

Related Minerals - Strunz-mindat GroupingHide

4.JM.WortupaiteMgNi2+2(Te4+O3)3 · 3H2OHex. 6/m : P63/m
4.JM.RudolfhermanniteFe2(Te4+O3)3 · H2OHex. 6/m : P63/m
4.JM.05ZemanniteMg0.5ZnFe3+(Te4+O3)3 · 4.5H2OTrig. 3 : P3
4.JM.05KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2OHex. 6 : P63
4.JM.05KinichiliteMg0.5Mn2+Fe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
4.JM.05IlirneyiteMg0.5ZnMn3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
4.JM.10EmmonsiteFe3+2(TeO3)3 · 2H2OTric. 1 : P1
4.JM.15GraemiteCu[TeO3] · H2OOrth. mmm (2/m 2/m 2/m) : Pmma
4.JM.20TelluromandarinoiteFe3+2Te3O9 · 6H2O Mon. 2/m : P21/b
4.JM.20TeineiteCu2+(Te4+O3) · 2H2OOrth. 2 2 2 : P21 21 21
4.JM.25MillsiteCu2+(Te4+O3) · 2H2OMon. 2/m : P21/b

Other InformationHide

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 BlakeiteHide

References for BlakeiteHide

Localities for BlakeiteHide

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.
Mexico
 
  • Sonora
    • Moctezuma Municipality
Lapis 2001 (1)
USA
 
  • Nevada
    • Esmeralda County
      • Goldfield Mining District
        • Goldfield
Castor et al. (2004)
Castor et al. (2004)
Palache et al. (1951)
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