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The Mineral paradamite

Yellow Paradamite Balls

Paradamite is a rare polymorph of the more common Adamite. It is chemically the same mineral type as Adamite, but being that it crystallizes in a different crystal system, it is scientifically recognized as an individual mineral type. It is generally very hard to distinguish from regular Adamite by looks alone. Paradamite crystals are almost always embedded in rusting, crumbly, brown Limonite that stains the hands.

Chemical Formula

Zn2(AsO4)(OH)

Color

Pale to dark yellow

Crystal System

Triclinic

Properties

Streak
White
Hardness
3.5
Transparency
Transparent to translucent
Specific Gravity
4.5
Luster
Vitreous
Cleavage
1,3
Fracture
Uneven
Tenacity
Brittle
Other ID Marks
Fluorescent yellow or yellow green in shortwave ultraviolet light.

Crystal Habits

As tabular and often rounded crystals, usually small in size and in crystal groupings.

Additional Information

Composition
Basic zinc arsenate
In Group
Phosphates; Arsenates
Striking Features
Association with Limonite, crystals, and fluorescence.
Environment
As a secondary mineral in the oxidation zone of hydrothermal replacement deposits.
Rock Type
Sedimentary, Metamorphic

Noteworthy Localities

Paradamite is a very rare mineral with few localities. Its main occurrence is the prolific Adamite locality of Mapimi, Durango, Mexico. Two other localities are Tsumeb, Namibia; and Lavrion, Greece.

Distingushing Similar Minerals

Olivenite - Usually has a greener color and usually occurs in tall, thin crystals.
Smithsonite - Usually occurs finely globular, and doesn't fluoresce.
Adamite - Different crystal form.

paradamite Photos



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