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Untreated chalcopyrite should look brassy
This is a rare and still very useful entomological reference
but supply the "rustic" glass stopper along with the cork until we run out of "covid specials" and can get machine-ground bottles again
apparently hydrothermally altered volcanic ash
Monastery Beach
asbestos - tremolite (amphibole) asbestos - teaching hand specimen of fibers in a screw-cap pyrex tube Untreated chalcopyrite should look brassyAsbestiform tremolite from the McIlroy Mine, Inyo County, California. Tremolite is a calcic amphibole which forms a solution series with actinolite and ferro actinolite. The ideal formula is Ca2Mg5Si8O22(OH)2 . Tremolite asbestos is fairly uncommon, and most of the tremolite asbestos mined in the US, including from this mine, went to the Powhatan Mining Company in Woodlawn, MD, for the manufacture of the filter used in Gooch crucibles. These
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