Plasma | Gemopedia

Plasma is the term for a deep green chalcedony that often shows small yellow, red or white spots.
Colors
Dark Green With White, Yellowish Spots

Plasma Classification

Common Name

Plasma

Species

Quartz

Variety

Chalcedony

Colors

Dark Green With White, Yellowish Spots

Alternate Names

Gemstone Groups

Key Separations

RI, SG, appearance and fracture

Comments

Plasma Optical Properties

Transparency

Semitransparent - 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

Plasma Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Plasma Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

2.55-2.7 Typical:2.6

Toughness

Excellent

Inclusions

Plasma is dark green with white or yellowish spots. The stones semitransparent to opaque nature is what separates plasma from other chalcedonies.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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