Andesine-Labradorite | Gemopedia

Andesine-Labradorite is a beautiful crystalline gem that is a combination of two feldspar varieties: andesine and labradorite. Its name "andesine" refers to the Andes Mountains where andesine was first found and the name "labradorite" was derived from Labrador, Canada, where labradorite was first discovered. So why the hyphenated name? Chemically speaking, our material falls between andesine and labradorite, so we chose to hyphenate and use both terms to be more accurate and descriptive.
Colors
Red, Orange, Yellow, Green

Andesine-Labradorite Classification

Common Name

Andesine-Labradorite

Species

Andesine-Labradorite

Variety

Colors

Red, Orange, Yellow, Green

Alternate Names

Gemstone Groups

Feldspar

Key Separations

RI, birefringence

Comments

Red and green andesine-labradorite is produced by adding copper to the otherwise pale yellow feldspar gem through a treatment called diffusion.

Andesine-Labradorite Optical Properties

Transparency

Transparent - Semitranslucent

Refractive Index

1.558-1.57

Birefringence

0.009

Optic Character

Biaxial

Optic Sign

Positive or Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Andesine-Labradorite Chemistry & Crystallography

Chemical Name

calcium or sodium silicate

Chemical Formula

NaAlSi3O8 or CaAl2Si2O8

Synthesis

Crystal System

Triclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Andesine-Labradorite Characteristic Physical Properties

Hardness

6-6.5

Streak

White

Specific Gravity

2.64-2.74

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Good

Fracture

Cleavage

Perfect, in two directions

Comments

Andesine-Labradorite
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