Gilson Imitation Coral | Gemopedia

A synthetic, imitation coral made from calcite and silica, Gilson imitation coral requires heat and pressure to create the final product. This imitation does not exhibit the natural grains often visible in true coral, and shows fine granulation under magnification.
Colors
Red, Pink

Gilson Imitation Coral Classification

Common Name

Gilson Imitation Coral

Species

NA

Variety

Colors

Red, Pink

Alternate Names

Gemstone Groups

Key Separations

RI and magnification

Comments

Misnomer: synthetic coral

Gilson Imitation Coral Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.55

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: inert
LWUV: variable

CCF Reaction

Pleochroism

None

Dispersion

Comments

Gilson Imitation Coral Chemistry & Crystallography

Chemical Name

Chemical Formula

Synthesis

Crystal System

NA

Classification

Nature

Simulant

Crystallinity

Aggregate

Comments

Gilson Imitation Coral Characteristic Physical Properties

Hardness

3.5-4

Streak

Specific Gravity

Typical:2.44

Toughness

Good

Inclusions

Natural coral will have polyp cavities and fibrous structure imitation coral will have a granular structure under magnification.

Luster

Subvitreous

Stability

Fracture

Granular

Cleavage

None

Comments

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