Amosite, crocidolite, tremolite, anthophyllite and actinolite are members of the amphibole class. Associated minerals include garnets, vesuvianite, diopside, tremolite, epidote, plagioclase feldspar, pyroxene and calcite. Tremolite asbestos constituted a contaminant of many if not all naturally occurring chrysotile deposits. Associated minerals include&colon; epidote, tremolite, glaucophane, orthoclase, quartz and calcite. There are deposits of muscovite and tremolite asbestos. These are&colon; anthophyllite, riebeckite, cummingtonite/grunerite series, and actinolite/tremolite series. Tremolite forms by metamorphism of sediments rich in dolomite and quartz. Approximately 40,200 tons of tremolite asbestos is mined annually in India. Like tremolite, asbestiform actinolite is regulated as asbestos. Much of the asbestos is known to emanate from fibrous tremolite or actinolite. The fibrous form of tremolite is one of the six recognised types of asbestos. Tremolite is an indicator of metamorphic grade since at high temperatures it converts to diopside. There are two types of serpentine at Kynance&colon; bastite and tremolite. Tremolite forms a series with actinolite and ferro-actinolite. Hexagonite is the red to pink, lilac to purple "manganoan" variety of tremolite.