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Colemanite

Colemanite

Release time:23 August 2019
Colemanite

Type
Mineral

Mineral Classification
Inoborates

Chemical Formula
CaB3O4(OH)3·H2O

Streak
White

Mohs Hardness
4.5

Crystal System
Monoclinic

Color
White, clear, colorless, gray

Luster
Vitreous

Fracture
Conchoidal

Description

Colemanite is a hydrated calcium borate, an altered variation of borax. Over 200 minerals contain boron, but colemanite is one of only a few which is commercially important. It contains 50% B2O3. It forms at a lower pH and warmer temperature than other borates including ulexite.

Uses

See Boron

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