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|Colour:||Yellowish, greenish to ...|
|Name:||From the locality where it was found in the state of Montana, USA.|
An alteration product of Tetradymite.
Classification of Montanite
|Strunz 8th edition ID:||4/K.15-60|
|Nickel-Strunz 10th (pending) edition ID:||7.CD.60|
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
D : With only large cations
|Dana 7th edition ID:||18.104.22.168|
|Dana 8th edition ID:||22.214.171.124|
33 : SELENATES AND TELLURATES
2 : (AB)m(XO6)·xH2O, where x can equal zero
|Hey's CIM Ref.:||28.4.14|
28 : Selenites, Selenates, Tellurites, and Tellurates
4 : Tellurates
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Type Occurrence of Montanite
|Co-type Localities:||Highland District (Siberia District), Silver Bow Co., Montana, USA|
Fish Creek placers (Highland Gulch placers), Highland District (Siberia District), Silver Bow Co., Montana, USA
|Year of Discovery:||1868|
Physical Properties of Montanite
|Colour:||Yellowish, greenish to white|
Crystallography of Montanite
|Morphology:||Earthy to compact.|
Optical Data of Montanite
|RI values:||nα = 2.090 nβ = 2.090|
|Maximum Birefringence:||δ = 2.090|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
|Dispersion:||r < v extreme|
Chemical Properties of Montanite
|Simplified for copy/paste:||Bi2(TeO6)·2H2O|
|Essential elements:||Bi, H, O, Te|
|All elements listed in formula:||Bi, H, O, Te|
Relationship of Montanite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Montanite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Montanite
Genth (1868) American Journal of Science: 45: 318.
Mingaye (1888) Australasian Association for the Advancement of Science: 1: 116.
Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 112.
Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 636-637.
Doklady Akademii Nauk SSSR (1980): 255: 968.
Internet Links for Montanite
Localities for Montanite
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Malenco Valley, Valtellina, Sondrio Province, Lombardy, ItalyFrom Paolo Bosio, 28th Jul 2014 14:22:15