Environmental Laboratory Approval Program
any mineral belonging to the amphibole assemblage solid-solution series associated with the libby, MT vermiculite deposit but not limited to only those minerals from that unique location. includes, but is not limited to, richterite, winchite, tremolite, and actinolite. 1.3.7. micaceous mineralsvermiculite concentration increased expansion volume cub.mt. impurities content micron: 0.540 mm 0.180 mm. 1000 1100 77%. 5,5 23. super fine: 0.800 mm 0.350 mm. 910 1000 80%. 20. fine: 1.2 mm 0.350 mm. 910 1000 78%.vermiculite ore is invariably an alteration product of a variety of mafic minerals: biotite, phlogopite, rarely muscovite, diopside, tremolite, augite, hornblende, olivine, chlorite, and serpentine. all known deposits have formed in the zone of circulating groundwater above the water table.