Tremolite

Description

Tremolite is a calcium-magnesium silicate belonging to the amphibole group, defined by the chemical formula Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2. Geologically, it originates through the metamorphism of quartz- and dolomite-rich sedimentary rocks. The mineral exhibits a solid solution series with actinolite and ferro-actinolite, where iron substitution for magnesium leads to a color transition from a creamy white in its pure state to a deep green. Structurally, tremolite presents as either crystalline formations or fibrous aggregates, with a hardness ranging from 5 to 6 on the Mohs scale. A notable crystalline manifestation is the gemstone nephrite, a variety of jade. Within ceramic and mineralogical contexts, tremolite is identified primarily as a fibrous magnesium silicate, which necessitates careful handling due to its potential habit.