Gilson Imitation Lapis | Gemopedia

Gilson imitation lapis is a man-made lapis simulant that gives the look of the widely appreciated natural gemstone lapis lazuli. Because this imitation jewel has some ingredients and physical properties not shared with natural lapis, it is considered a simulant, as opposed to synthetic stone.
Colors
Intense Medium To Dark Blue To Violet Blue

Gilson Imitation Lapis Classification

Common Name

Gilson Imitation Lapis

Species

NA

Variety

Colors

Intense Medium To Dark Blue To Violet Blue

Alternate Names

Gemstone Groups

Key Separations

Appearance, RI, magnification and SG. Due to the porous nature the SG will change after the stone is soaked in water

Comments

Misnomer: synthetic lapis lazuli

Gilson Imitation Lapis Optical Properties

Transparency

Opaque

Refractive Index

1.53-1.55

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Fluorescence

SWUV: inert
LWUV: inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Gilson Imitation Lapis Chemistry & Crystallography

Chemical Name

Chemical Formula

Synthesis

Crystal System

NA

Classification

Nature

Simulant

Crystallinity

Comments

Gilson Imitation Lapis Characteristic Physical Properties

Hardness

3

Streak

Strong Blue

Specific Gravity

2.33-2.53

Toughness

Fair

Inclusions

Gilson imitation lapis will have vibrant and even coloration. Small amounts of minute pyrite particles will be evenly distributed throughout the stone. Surface of the stone might show many small angular, dark violet patches in reflected light. Pyrite inclusions will not have dark blue ring surrounding the inclusion.

Luster

Vitreous

Stability

Fracture

Granular, Uneven

Cleavage

None

Comments

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