Chrome Chalcedony | Gemopedia

Chrome chalcedony contains chromium, normally seen in the most coveted gems in the world; namely alexandrite, emerald and ruby. Present in small amounts, chromium gives these stones their unique shades of green, which have been compared to green seawater. Chrome chalcedony is usually untreated, as absolutely nothing is required to make this stone desirable! Although chrome chalcedony somewhat resembles chrysoprase in appearance, the two receive their color from two different elements.
Alternate
Names
Mtorodite Or Mtorolite
Colors
Green To Slightly Bluish Green

Chrome Chalcedony Classification

Common Name

Chrome Chalcedony

Species

Quartz

Variety

Chalcedony

Colors

Green To Slightly Bluish Green

Alternate Names

Mtorodite Or Mtorolite

Gemstone Groups

Key Separations

Appearance, fracture, refractive index, spectrum

Comments

Mtorodite or mtorolite: trade name for chrome chalcedony from Zimbabwe.Colored by chromium.

Chrome Chalcedony Optical Properties

Transparency

Transparent - Semitranslucent

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

Light grayish pink or reddish

Pleochroism

None

Dispersion

Strength: none

Comments

Chrome Chalcedony Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Chrome Chalcedony Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

2.55-2.7 Typical:2.6

Toughness

Excellent

Inclusions

Chrome chalcedony might contain black chromite crystals. Look for lack of dye concentrations to separate from dyed chalcedony.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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