Tremolite | Gemopedia

Deriving its name from a locality in the Swiss Alps, tremolite is a member of the amphibole group, a complex series of silicate minerals. It forms in thin, parallel fibers, sometimes producing a distinct cat's eye effect when cut in cabochons. Tremolite comes in a variety of colors ranging from white, brown, colorless, gray, light green, light yellow and pink-violet. This gem sometimes occurs as fine, needle-like inclusions in emerald and quartz.
Alternate
Names
Chrome-Tremolite, Hexagonite, Grammatite
Colors
Gray, Green, Brown, Yellow, Lavender To Pink, White, Colorless

Tremolite Classification

Common Name

Tremolite

Species

Tremolite

Variety

Colors

Gray, Green, Brown, Yellow, Lavender To Pink, White, Colorless

Alternate Names

Chrome-Tremolite, Hexagonite, Grammatite

Gemstone Groups

Key Separations

Comments

Chrome-tremolite is the green variety of tremolite colored by chrome. Hexagonite is the transparent pink to lilac pink variety of tremolite. Stones can be chatoyant.

Tremolite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.56-1.643

Birefringence

0.017-0.027

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to moderate orange to yellow
LWUV: Inert to moderate orange or pink

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire

Comments

Tremolite Chemistry & Crystallography

Chemical Name

calcium magnesium iron silicate

Chemical Formula

Ca2Mg5Si8O22(OH)2

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Tremolite Characteristic Physical Properties

Hardness

5-6

Streak

White

Specific Gravity

2.95-3.07

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

Perfect, in one direction

Comments

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