Demantoid Garnet | Gemopedia

Demantoid garnet is one of the most desirable of all colored gemstones and extremely rare. A color variety of andradite garnet, the name demantoid originates from the old German word demant meaning "diamond-like," because of a luster and dispersion that yields a fire even higher than diamonds.
Colors
Light To Dark Green To Yellow-Green

Demantoid Garnet Classification

Common Name

Demantoid Garnet

Species

Andradite

Variety

Demantoid

Colors

Light To Dark Green To Yellow-Green

Alternate Names

Gemstone Groups

Garnet

Key Separations

OTL RI reading, lack of doubling, magnification and spectrum.

Comments

Demantoid Garnet Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.888-0

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: strong fire Value: 0.57

Comments

Demantoid Garnet Chemistry & Crystallography

Chemical Name

calcium iron silicate

Chemical Formula

Ca3Fe2(SiO4)3

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Demantoid Garnet Characteristic Physical Properties

Hardness

6.5-7

Streak

Specific Gravity

3.81-3.87 Range:0.03/-0.03 Typical:3.84

Toughness

Poor

Inclusions

Demantoid garnet is a type II clarity stone. Stones might show surface abrasions. Some stones might contain fibrous chysotile asbestos or "horsetail inclusions". Namibian stones might show stress fractures.

Luster

SubAdamantine

Stability

Good

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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