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Pearceite
A valid IMA mineral species - grandfathered
This page kindly sponsored in memory of Anna Maria Diana
Colour:
Black
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
6.15
Crystal System:
Trigonal
Member of:
Name:
Named in honor of Dr. Richard Pearce (June 29, 1837 Barripper, Cornwall - May 18, 1927 London), chemist and metallurgist. He spent three decades in the United States, erecting smelters near Denver, Colorado and in Butte, Montana. He was a founding member of the Colorado Scientific Society. He donated many specimens to the British Museum.
Pearceite-Polybasite series.
Originally pearceite was thought to be an arsenic analogue ofpolybasite.
"Arsenpolybasite" was, however, found to represent two different polytypes of pearceite, pearceite-T2ac and pearceite-M2a2b2c.
Pearceite forms a series withpolybasite-Tac (formerly "antimonpearceite"), which is a polytype ofpolybasite.
The old name pearceite was replaced by pearceite-Tac, antimonpearceite by polybasite-Tac, arsenpolybasite-221 by pearceite-T2ac, and arsenpolybasite-222 by pearceite-M2a2b2c (Bindi et al. 2007).
Originally pearceite was thought to be an arsenic analogue ofpolybasite.
"Arsenpolybasite" was, however, found to represent two different polytypes of pearceite, pearceite-T2ac and pearceite-M2a2b2c.
Pearceite forms a series withpolybasite-Tac (formerly "antimonpearceite"), which is a polytype ofpolybasite.
The old name pearceite was replaced by pearceite-Tac, antimonpearceite by polybasite-Tac, arsenpolybasite-221 by pearceite-T2ac, and arsenpolybasite-222 by pearceite-M2a2b2c (Bindi et al. 2007).
![[Ag6As2S7][Ag9CuS4]](#"/photo-908450.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2f62%2f81%2f07869850017271925905847.jpg&f=jpg&w=240" alt="07869850017271925905847.jpg" /></a><div><b>Richard Pearce</b></div></div></div><div><div><span>Formula:</span><div class=){kind=link}