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Chambersite Pyramidal Crystal

The Mineral chambersite

Chambersite is a rare mineral of the boracite group, a solid solution series of chloro-borates, with Boracite, Chambersite, and Ericaite as the main members. It is the manganese-rich end member of this group. Chambersite is known for its equidimensional triangular crystals, which form in a lovely purple color but are always very small. Chambersite is named after Chambers County, Texas, where it was first discovered in 1957.
Chemical Formula Mn3B7O13Cl
Composition Manganese chloro-borate
Color Light to dark purple
Streak White
Hardness 7
Crystal System Orthorhombic
3D Crystal Atlas
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Crystal Forms
and Aggregates
Crystals are in tetrahedral habit, often well formed looking like a pyramid. Crystals are almost always in isolated single floater crystals that are small in size. Seldom in penetrating or connected triangular crystals. May have triangular etchings in crystal faces, and terminations may be slightly modified. Crystals convert to an orthorhombic crystal structure upon cooling after their formation, though the isometric shape of the tetrahedron is preserved.
Transparency Transparent to nearly opaque
Specific Gravity 3.5
Luster Vitreous
Cleavage None
Fracture Uneven
Tenacity Brittle
Other ID Marks Darkens upon prolonged exposure to sunlight
In Group Borates; Anhydrous Borates
Striking Features Crystal habits, hardness, and mode of occurrence
Environment In salt domes.
Rock Type Sedimentary
Popularity (1-4) 2
Prevalence (1-3) 3
Demand (1-3) 2

Chambersite AUCTIONS

Chambersite is a rare collector's mineral, with its well-formed, small crystals making highly collectible specimens for thumbnail collectors.

The two best-known occurences for Chambersite are Barbers Hill, Mont Belvieu, Chambers Co., Texas; and the Venice Salt dome, Plaquemines Parish, Louisiana.

Halite, Anhydrite, Gypsum

chambersite PHOTOS
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