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Formula: Bi8Te3
Telluride of bismuth,
tetradymite group
Crystal System: Trigonal
Specific gravity: 8.8798 calculated for the ideal formula
Colour: Pale grey
Luminescence: No fluorescence is observed
Magnetism: Non-magnetic
Environments
Ehrigite is a new mineral, approved in 2023 although it had been reported several times prior to approval.
Localities
At the type locality, the Goodhope Mine, Hedley, Osoyoos Mining Division, British Columbia, Canada, ehrigite is
found as sub-100 micron-sized grains in a type specimen from the abandoned gold
mine. It occurs within disseminations of other bismuth minerals in a
hedenbergite skarn. Individual
grains of ehrigite are compositionally homogeneous, typically less than 20 microns in size (rarely up to 60
microns), and closely associated with other phases of the
tetradymite group. The assemblage features dominant
joséite-B and native bismuth, with
subordinate hedleyite and traces of
joséite-A. Other associated minerals in the type material are
native gold, scheelite and
molybdenite.
Ehrigite is silver-grey with a metallic lustre, opaque and a with platy habit.
(CJMP 62.6.847-861).
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