RockVault
Tremolite

Image: <a rel="nofollow" class="external text" href="http://www.mindat.org/user-13767.html#0">John Krygier</a> (Public domain)

monocliniccommonSilicates

Tremolite

Ca2Mg5Si8O22(OH)2

This specimen features a mass of white to pale gray tremolite crystals, exhibiting a 'glimmery' appearance and forming criss-crossing aggregates.

Tremolite Physical Properties

Mohs Hardness

5

Crystal System

monoclinic

Luster

vitreous

Streak Color

white

Cleavage

Perfect on {110} at 56 and 124 degrees

Fracture

uneven

Specific Gravity

2.9

Colors

white, gray, pale green, colorless

Transparency

translucent

Type Locality

Balmat, Balmat-Edwards Zinc District, St. Lawrence County, New York, USA

Mineral Group

Silicates

Uses

collector, scientific_research

Associated Minerals

calcite, dolomite, diopside, talc, quartz

Rarity

common

Geological Context

Tremolite is a common metamorphic mineral, typically forming in metamorphosed dolomitic limestones or ultramafic rocks under medium-grade metamorphic conditions.