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Formula: Bi2MoO6
Anhydrous molybdate,
koechlinite group
Crystal System: Orthorhombic
Specific gravity: 8.26 calculated
Streak: Pale greenish yellow
Colour: Greenish yellow, white to light grey, greenish yellow in transmitted light
Solubility: Readily soluble in hydrochloric acid, less so in nitric acid
Environments
Koechlinite occurs as a rare alteration product in the oxidation zone of
bismuth-molybdenum deposits
(HOM).
Localities
At the Little Bygoo group mines, Ardlethan, Bourke county, New South Wales, Australia, koechlinite occurs with
bismoclite
(AM 28.536-540, Dana).
At the Old 25 Pipe, Kingsgate, Gough county, New South Wales, Australia, koechlinite occurs as
secondary, massive material between blades of
molybdenite, and occasionally as fibres, probably
pseudomorphing bismuthinite; it is frequently
associated with bismite and bismutite
(AJM 10-1.9-10).
At the Dunallen Gold Mine, Coolgardie, Coolgardie Shire, Western Australia, koechlinite occurs as an alteration product of
tetradymite
(Dana).
At the type locality, the Daniel mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany, koechlinite occurs in cavities in vein
material composed of quartz, bismuth and
skutterudite
(Webmin, Dana, HOM).
At the Torgovskoe Uranium deposit, Torgo River Basin, Chara and Tokko Rivers Confluence, Aldan Shield, Sakha Republic, Eastern-Siberian Region, Russia,
koechlinite is associated with molybdenite,
bismuthinite, aikinite,
bismite, wulfenite and
quartz
(HOM).
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