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Colemanite Colemanite

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Colemanite (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite. It was first described in 1884 for an occurrence near Furnace Creek in Death Valley and was named after William Tell Coleman (1824-1893), owner of the mine Harmony Borax Works where it was first found. Colemanite is a borate mineral found in evaporate deposits. Colemanite is a mineral formed when borax deposits occur, then usually covered with boron containing water. Then, when the water evaporates, the boron remains on the colemanite. The mix of boron and borax form mineral deposits of colemanite. It was named after William T. Coleman (1824-1893), the owner of the mine where it was found.

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Biaxial

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45

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Bright pale yellow fluorescence, may phosphoresce pale green; pyroelectric and piezoelectric at very low temperature.

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242

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Colemanite Colemanite

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Borate

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Monoclinic 2/m

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Exfoliates on heating, produces a green flame

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2.42

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White

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CaB3O43·H2O

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Monoclinic - Prismatic

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4.5

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6

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Colorless, white, yellowish, grey

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15

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Mineral

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a = 8.712 Å, b = 11.247 Å, c = 6.091 Å; β = 110.12°; Z = 4

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[010] perfect, [001] distinct

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Massive granular to coarsely crystalline, most commonly nodular.

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Koal-mahn-ight

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Transparent to translucent

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Brittle uneven to subconchoidal

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nα = 1.586 nβ = 1.592 nγ = 1.614

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Vitreous

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δ = 0.028

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Colemanite is a borate mineral found in evaporate deposits. Colemanite is a mineral formed when borax deposits occur, then usually covered with boron containing water. Then, when the water evaporates, the boron remains on the colemanite. The mix of boron and borax form mineral deposits of colemanite. It was named after William T. Coleman (1824-1893), the owner of the mine where it was found. Colemanite (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite. It was first described in 1884 for an occurrence near Furnace Creek in Death Valley and was named after William Tell Coleman (1824-1893), owner of the mine Harmony Borax Works where it was first found.