asbestos - tremolite (amphibole) asbestos - teaching hand specimen of fibers in a screw-cap pyrex tube either a black and silver

either a black and silver pen

This is a rare and still very useful entomological reference

apparently hydrothermally altered volcanic ash

These were sent to subscribers in parts

angular-grained quartz sand from Zuma Beach

asbestos - tremolite (amphibole) asbestos - teaching hand specimen of fibers in a screw-cap pyrex tube either a black and silverAsbestiform 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