Actinolite | Gemopedia

Generally transparent or translucent green, green-black, or grey-green in color, actinolite is named after the Greek word for "ray" or "beam," aktinos, referring to its fibrous nature. Actinolite also goes by the nickname 'ray stone' and is fairly prevalent worldwide.
Alternate
Names
Smaragdite
Colors
Light To Dark Green, Yellowish Green, Brown, White, Gray, Black

Actinolite Classification

Common Name

Actinolite

Species

Actinolite

Variety

Colors

Light To Dark Green, Yellowish Green, Brown, White, Gray, Black

Alternate Names

Smaragdite

Gemstone Groups

Amphibole

Key Separations

RI, appearance, magnification polariscope reaction, spectrum. Parallel fibrous structure in cat's eye stones.

Comments

Actinolite usually fibrous aggregate. Misnomer jade cat's-eye.Smaragdite is the emerald green variety of actinolite.

Actinolite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.614-1.164
Tolerance:(+0.014/-0.014)

Birefringence

0.022-0.027

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Dichroic, moderate yellow and dark green.

Dispersion

Strength: none

Comments

Actinolite Chemistry & Crystallography

Chemical Name

calcium magnesium iron silicate hydroxide

Chemical Formula

Ca2(Mg, Fe)5Si8O22(OH)2

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Actinolite Characteristic Physical Properties

Hardness

5-6

Streak

White

Specific Gravity

2.95-3.1 Typical:3

Toughness

Varies

Inclusions

It is the fibrous structure that causes chatoyancy.

Luster

Vitreous

Stability

Good

Fracture

Even

Cleavage

Perfect, in two directions

Comments

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