Chrysoprase | Gemopedia

One of the most coveted varieties of chalcedony quartz, chrysoprase is prized for its apple green color and rarity. Chrysoprase's name comes from the Greek words chrysos, meaning gold and prason, meaning leek, due to its color similarities with the vegetable.
Colors
Light To Medium Dark Yellowish Green, Apple Green

Chrysoprase Classification

Common Name

Chrysoprase

Species

Quartz

Variety

Chalcedony

Colors

Light To Medium Dark Yellowish Green, Apple Green

Alternate Names

Gemstone Groups

Key Separations

RI, SG and fracture

Comments

Color is natural and due to nickel. Color can fade if exposed to heat or sunlight and might be restored if stored in water. If found with brown or white matrix it is called chrysoprase matrix.

Chrysoprase Optical Properties

Transparency

Semitransparent - Translucent

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

Unobservable

Dispersion

Strength: none

Comments

Chrysoprase Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Chrysoprase Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

2.55-2.7 Typical:2.6

Toughness

Varies

Inclusions

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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