Antigorite | Gemopedia

Antigorite is a hard, compact variety of serpentine occurring either in corrugated plates or fibers. Serpentine is well known to mineralogists and gemologists, but is much less familiar to the general public. Often similar to jade in appearance, it is primarily used an ornamental material and has been carved into a wide array of decorative objects throughout history. Antigorite is usually green, but may be yellowish, gray, brown or black.
Colors
Dark Green, Blue-Green, Yellowish, Gray, Brown, Black

Antigorite Classification

Common Name

Antigorite

Species

Antigorite

Variety

Colors

Dark Green, Blue-Green, Yellowish, Gray, Brown, Black

Alternate Names

Gemstone Groups

Serpentine

Key Separations

RI, magnification, spectrum, appearance and surface condition.

Comments

Antigorite is a hard compact variety of serpantine that occurs in pleated masses.

Antigorite Optical Properties

Transparency

Semitransparent - Opaque

Refractive Index

1.557-1.571

Birefringence

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Unobservable

Dispersion

Comments

Antigorite Chemistry & Crystallography

Chemical Name

hydrous magnesium iron phyllosilicate

Chemical Formula

(Mg)3Si2O5(OH)4

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Microcrystalline

Comments

Antigorite Characteristic Physical Properties

Hardness

2.5-3.5

Streak

White

Specific Gravity

2.58-2.61

Toughness

Poor

Inclusions

Antigorite often shows scratches and poor polish due to low mohs hardness. Stones are fine grained and has a flaky structure.

Luster

Waxy

Stability

Fracture

Granular, Uneven

Cleavage

Perfect, in one direction

Comments

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