Colemanite

Colemanite (Ca₂B₆O₁₁·5H₂O) is a borate mineral found in evaporite deposits. Colemanite is a secondary mineral that forms when borax is deposited, and then regularly covered with boron containing water. The boron remains after the water evaporates, and the boron and borax eventually form other minerals as for example Colemanite. Colemanite. ... Colemanite. ... The borate ion is BO33-. A borate is a compound of boron and oxygen with more electropositive elements. ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... Borax, (Na2B4O7·10H2O, sodium borate or sodium tetraborate) is an important boron compound. ... General Name, Symbol, Number boron, B, 5 Chemical series metalloids Group, Period, Block 13, 2, p Appearance black Atomic mass 10. ... General Name, Symbol, Number boron, B, 5 Chemical series metalloids Group, Period, Block 13, 2, p Appearance black Atomic mass 10. ... General Name, Symbol, Number boron, B, 5 Chemical series metalloids Group, Period, Block 13, 2, p Appearance black Atomic mass 10. ... Borax, (Na2B4O7·10H2O, sodium borate or sodium tetraborate) is an important boron compound. ...

It was named after William T. Coleman (1824-1893), owner of the mine where it was first found. 1824 was a leap year starting on Thursday (see link for calendar). ... 1893 was a common year starting on Sunday (see link for calendar). ...

Group: Borates, Hardness: 4.5, Specific gravity: 2.42, cleavage: perfect, Fracture: uneven-conchoidal, mineral may be white, yellow, or gray. Streak: white. Transparent-translucent, luster: vitreous. Forms in evaporative deposites. Soluble in hydrochloric acid. Fuses easily, breaks up, and colors a flame green. It is monoclinic. Crystals are short and prismatic.