Mali Garnet | Gemopedia

Mali garnet is one of the latest discoveries in the garnet family. This attractive and very interesting rare mixture of andradite and grossular was only discovered in late 1994 at the Sandar Mine in Mali's Kayes region (Diakon Arrondissement). Extremely rare, Mali garnets are a bright, uniform light yellowish green color.
Alternate
Names
Grandite
Colors
Slightly Greenish Yellow, Intense Green To Brown-Orange, Dark Orangy Brown

Mali Garnet Classification

Common Name

Mali Garnet

Species

Grossularite-Andradite

Variety

Mali Garnet

Colors

Slightly Greenish Yellow, Intense Green To Brown-Orange, Dark Orangy Brown

Alternate Names

Grandite

Gemstone Groups

Garnet

Key Separations

RI, SR nature and spectrum.

Comments

Yellowish green stones RI: 1.752 to 1.769 SG:3.64 to 3.68Green stones RI: 1.762 to 1.764 SG: 3.65 to 3.67Orange stones RI 1.773 to 1.779 SG: 3.67 to 3.68

Mali Garnet Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.752-1.779

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Comments

Mali Garnet Chemistry & Crystallography

Chemical Name

Chemical Formula

Ca3(Al,Fe3+,Mn,Cr2Si3O12 to Ca3(Fe3+,Al,Cr,,Ti)2Si3O12

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Mali Garnet Characteristic Physical Properties

Hardness

6.5-7.5

Streak

Specific Gravity

3.64-3.68

Toughness

Good

Inclusions

Many Mali garnet stones are inclusion free but sometimes small mineral crystals and fingerprints are found along with parallel growth planes.

Luster

SubAdamantine

Stability

Good

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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