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Crystal Cinnabar

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Crystal Forms 
and Aggregates

Crystals are usually in thick tabular form with modified faces. Crystals are often integrown or twinned in penetration twins. Also as elongated rhombohedrons, in six-pointed star-shaped twins, and in complex crystal forms. Also massive, granular, in veins, in small ball-shaped aggregates, encrusting, and globular. Crystals are often striated.
 

Transparency

Transparent to opaque

Specific Gravity

8.0 - 8.1

Luster

Adamantine, submetallic, dull

Cleavage

1,3

Fracture

Uneven

Tenacity

Brittle to slightly sectile

Other ID Marks

Cinnabar crystals are birefringent, though transparent crystals are often too small or embedded in a matrix for this property to be properly observed.
 

In Group

Sulfides; Simple Sulfides

Striking Features

Color, heaviness, and low hardness.

Environment

In volcanic, mercury-rich deposits usually associated with hot springs. Also in epithermal veins.
 

Rock Type

Igneous, Metamorphic

Popularity (1-4)

2

Prevalence (1-3)

3

Demand (1-3)

1

 

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