Sapphirine | Gemopedia

Sapphirine was so named because of its resemblance in color to blue sapphire, even though the two minerals have completely different chemical, optical and physical properties. Sapphirine is very rare, with small gems only faceted for collectors. This gem is know for blue color, but occasionally forms in a red-orange variety.
Colors
Dark Blue, Greenish, Pink, Violet, Orange-Red, Colorless

Sapphirine Classification

Common Name

Sapphirine

Species

Sapphirine

Variety

Colors

Dark Blue, Greenish, Pink, Violet, Orange-Red, Colorless

Alternate Names

Gemstone Groups

Key Separations

RI and optic character.

Comments

Sapphirine Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.701-1.724

Birefringence

0.004-0.007

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Trichroic, strong, varying shades of body color

Dispersion

Strength: moderate fire Value: 0.019

Comments

Sapphirine Chemistry & Crystallography

Chemical Name

magnesium aluminum silicate

Chemical Formula

(Al,Mg)8(Al,Si)6O20

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Sapphirine Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

3.4-3.58

Toughness

Inclusions

Sapphirine is named for its similar appearance to sapphire.

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

None

Comments

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