Hessonite Garnet | Gemopedia

Nicknamed the "cinnamon stone", hessonite is a variety of grossular garnet and comes in two colors, golden and cinnamon. A perfectly colored hessonite is a bright golden orange that resembles a combination of honey and orange with an internal fire. Some hessonites have tints of red and brown with cinnamon appearance. Hessonite is common in the gem gravels of Sri Lanka and practically all hessonite is obtained from this locality, although it is also found in Africa. While the clearest gems are most prized, inclusions in hessonite are common, with unique toffee-like streaks giving hessonite an oily or even glass-like appearance.
Alternate
Names
Essonite, Cinnamon Stone, Hyacinth Or Jacinth
Colors
Medium To Dark Orange To Brownish Orange

Hessonite Garnet Classification

Common Name

Hessonite Garnet

Species

Grossularite

Variety

Hessonite

Colors

Medium To Dark Orange To Brownish Orange

Alternate Names

Essonite, Cinnamon Stone, Hyacinth Or Jacinth

Gemstone Groups

Garnet

Key Separations

RI, SR nature and magnification

Comments

Usually shows stubby, rounded included crystals and "heat wave" or "scotch-in-water" effect.

Hessonite Garnet Optical Properties

Transparency

Transparent - Semitransparent

Refractive Index

1.74-1.74
Tolerance:(+0.020/-0.010)

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: Inert to weak orange
LWUV: Inert to weak orange, pink or red

CCF Reaction

Pleochroism

None

Dispersion

Value: 0.028

Comments

Hessonite Garnet Chemistry & Crystallography

Chemical Name

Calcium aluminum silicate

Chemical Formula

Ca3Al2(SiO4)3

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Hessonite Garnet Characteristic Physical Properties

Hardness

7-7.5

Streak

Specific Gravity

3.57-3.73 Range:0.12/-0.04 Typical:3.61

Toughness

Good

Inclusions

Stubby, rounded included crystals. Shows oily, "heat wave" or "scotch in water" effect.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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