Sanidine | Gemopedia

Sanidine is a potassium-rich feldspar which is related to amazonite (microcline) and orthoclase by its chemistry. Sanidine gems that display adularescence, a mystical internal glow, are called moonstone. Colorless to yellow and pale brown gems have been found in Germany, Mexico, and Madagascar.
Colors
Colorless, Pale Pink, Gray, White, Yellow

Sanidine Classification

Common Name

Sanidine

Species

Orthoclase

Variety

Sanidine

Colors

Colorless, Pale Pink, Gray, White, Yellow

Alternate Names

Gemstone Groups

Feldspar

Key Separations

Comments

Sandine is a monoclinic disordered orthoclase. Some stone show low levels of radioactivity.

Sanidine Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.518-1.531

Birefringence

0.003-0.007

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to weak red-orange
LWUV: Inert to weak red-orange

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.012

Comments

Sanidine Chemistry & Crystallography

Chemical Name

Chemical Formula

KAlSi3O8

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Sanidine Characteristic Physical Properties

Hardness

6-6.5

Streak

White

Specific Gravity

Typical:2.6

Toughness

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal, Uneven

Cleavage

Perfect, in two directions

Comments

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