Spessartite Garnet | Gemopedia

While it was once just a collector's gem, spessartite, an orange variety of garnet, made its move into the mainstream during the 1990s when new deposits were discovered in Africa. Like most garnets, spessartite is typically untreated, so the beautiful color and clarity that you see in them is just as nature created it. Spessartite garnet is named after its first discovery in Spessart, Bavaria, in the mid 1800's.
Alternate Names
Spessartine Garnet, Mandarin Garnet If Bright Orange
Colors
Orange, Brownish Orange, Yellowish Orange, Reddish Orange, Red-Orange. Never Any Purple Component.

Spessartite Garnet Classification

Common Name

Spessartite Garnet

Species

Spessartite

Variety

Colors

Orange, Brownish Orange, Yellowish Orange, Reddish Orange, Red-Orange. Never Any Purple Component.

Alternate Names

Spessartine Garnet, Mandarin Garnet If Bright Orange

Gemstone Groups

Garnet

Key Separations

RI, SI nature, and spectrum. Color is also helpful.

Comments

Spessartite Garnet Optical Properties

Transparency

Transparent

Refractive Index

Over The Limit 1.81-1.81
Tolerance:(+0.004/-0.020)

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: weak fire Value: 0.027

Comments

Spessartite Garnet Chemistry & Crystallography

Chemical Name

manganese aluminium silicate

Chemical Formula

Mn3Al2(SiO4)3

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Spessartite Garnet Characteristic Physical Properties

Hardness

7-7.5

Streak

Specific Gravity

4.12-4.2 Range:0.05/-0.03 Typical:4.15

Toughness

Varies

Inclusions

Spessartite garnet is a type II clarity stone. Stones might have 2-phase, liquid inclusions that are feathery in appearance and rutile needle inclusions.

Luster

SubAdamantine

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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