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Tincalconite Pseudomorph after Borax

The Mineral tincalconite

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 · 5H2O
Composition Hydrous sodium borate
Color White
Streak White
Hardness 1
Crystal System Hexagonal
3D Crystal Atlas
(Click for animated model) 
Crystal Forms
and Aggregates
Always as a pseudomorph after Borax, with the same crystal forms. Also massive, grainy, and as a dehydrated powder.
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.
In Group Borates; Hydrous Borates
Striking Features Taste and solubility
Environment Borax evaporite deposits in dry lakes of arid regions.
Rock Type Sedimentary
Popularity (1-4) 3
Prevalence (1-3) 2
Demand (1-3) 2

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

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.

Borax, Ulexite, Kernite, Halite, Thenardite, Hanksite

Tincalconite's unusual properties distinguish it from all minerals.

tincalconite PHOTOS
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