Chondrodite | Gemopedia

Chondrodite, named for the Greek word for grain, "chondros," is a member of the humite group of minerals. Its gemmy hues range from red to yellow to orange, with the latter resembling the color of spessartite garnet. It can be found in several places including New York, Burma, Tanzania, and Afghanistan.
Colors
Red, Reddish Brown, Orange-Brown, Yellow, Gray-Green

Chondrodite Classification

Common Name

Chondrodite

Species

Chondrodite

Variety

Colors

Red, Reddish Brown, Orange-Brown, Yellow, Gray-Green

Alternate Names

Gemstone Groups

Humite

Key Separations

RI and birefringence

Comments

Some of the best specimens come from the Tilly Foster Mine in Brewster, NY and the Cardiff uranium mine in Wilberforce, Ontario, Canada. Gemstones often have a granular appearance.

Chondrodite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.592-1.646

Birefringence

0.028-0.034

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Fluorescence

SWUV: inert to yellow or brownish-orange
LWUV: inert to weak orange

CCF Reaction

Pleochroism

Dichroic, moderate orange-brown and yellow-brown

Dispersion

Comments

Chondrodite Chemistry & Crystallography

Chemical Name

Chemical Formula

(Mg,Fe2+)5[F, OH)2/SiO4)2]

Synthesis

Crystal System

Monoclinic

Classification

Nature

Natural

Crystallinity

Crystalline

Comments

Chondrodite Characteristic Physical Properties

Hardness

6-6.5

Streak

Yellow To Brown

Specific Gravity

3.1-3.26 Typical:3.2

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

None

Comments

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