Yellow crystals of the very rare bismuth tellurate from an American locality: Hachite, Hidalgo Co., New Mexico, United States of America. Analyzed by Sid Williams. — Photo: David Hospital · CC BY-SA 4.0
Montanite
Montanite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Bi³⁺₂Te⁶⁺O₆·nH₂O (0 ≤ n ≤ 2/3).
Key properties: specific gravity 3.7; Dull to waxy luster; optically biaxial.
IMA symbol Mta, IMA status: approved, named in 1868.
An alteration product of tetradymite.
It is found associated with Tetradymite, bismuthinite.
The name refers to its occurrence in Montana, USA.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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