Amethystine Chalcedony | Gemopedia

Also referred to as "damsonite," amethystine chalcedony is an opaque to semi-translucent variety that is, you guessed it, purple. As chalcedony is technically a quartz, this gem is much like traditional amethyst and even can be heat treated to become a yellowish orange citrine color.
Alternate
Names
Damsonite
Colors
Purple

Amethystine Chalcedony Classification

Common Name

Amethystine Chalcedony

Species

Quartz

Variety

Amethystine Chalcedony

Colors

Purple

Alternate Names

Damsonite

Gemstone Groups

Key Separations

RI, SG, appearance and fracture

Comments

Amethystine Chalcedony Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.535-1.539

Birefringence

0.004-0.004

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Amethystine Chalcedony Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Amethystine Chalcedony Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

1.55-1.7 Typical:1.6

Toughness

Excellent

Inclusions

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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