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The Mineral tincalconite

Tincalconite Pseudomorph after Borax

Most Borax specimens lose water in their structure if stored in dry areas and alter to Tincalconite. Although Tincalconite is found in a natural state, almost all specimens were transformed from Borax after being taken from the mine.

The name Tincal in ancient times applied to the mineral Borax, but now it is synonymous with Tincalconite.

Chemical Formula

Na2B4O7 ยท 5H2O

Color

White

Crystal System

Hexagonal

Properties

Streak
White
Hardness
1
Transparency
Opaque
Specific Gravity
1.88
Luster
Dull
Cleavage
None
Fracture
Earthy
Tenacity
Brittle
Other ID Marks
1) Has a sweetish, metallic taste.
2) Dissolves in water.

Crystal Habits

Always as a pseudomorph after Borax, with the same crystal forms. Also massive, grainy, and as a dehydrated powder.

3D Crystal Atlas

Additional Information

Composition
Hydrous sodium borate
In Group
Borates; Hydrous Borates
Striking Features
Taste and solubility
Environment
Borax evaporite deposits in dry lakes of arid regions.
Rock Type
Sedimentary

Other Names

Tincal The old name for Borax. May also refer to Tincalconite.

Noteworthy Localities

Tincalconite is found most significantly at the Boron, in the Kramer District, Kern Co., California. It occurs in several other Borax localities, such as Searles Lake, San Bernardino Co., and always as a pseudomorph of Borax.

Common Mineral Associations

Borax, Ulexite, Kernite, Halite, Thenardite, Hanksite

Distingushing Similar Minerals

Tincalconite's unusual properties distinguish it from all minerals.

tincalconite Photos



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