EntityQ421527· pop 14· linked from 177 articles

howlite

Howlite, a calcium borosilicate hydroxide (Ca2B5SiO9(OH)5), is a borate mineral found in evaporite deposits.

Key facts

Mineral.name: Howlite
Mineral.category: Inoborates
Mineral.image: Howlite.jpg
Mineral.imagesize: 260px
Mineral.formula: Ca2B5SiO9(OH)5
Mineral.IMAsymbol: How
Mineral.strunz: 6.CB.20
Mineral.dana: 25.3.5.1
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m) (same H-M symbol)
Mineral.symmetry: P21/c
Mineral.unit cell: a = 12.82 Å, b = 9.351(1) Å c = 8.608(2) Å; β = 104.84(2)°; Z = 4
Mineral.color: White, colorless
Mineral.habit: Massive to nodular, occurs as tabular prisms flattened parallel to [100]
Mineral.cleavage: None
Mineral.fracture: Conchoidal, uneven
Mineral.mohs: 3.5
Mineral.luster: Subvitreous, glimmering

via Wikipedia infobox

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Howlite, a calcium borosilicate hydroxide (Ca2B5SiO9(OH)5), is a borate mineral found in evaporite deposits.

== History == Howlite was discovered near Windsor, Nova Scotia, in 1868 by Henry How (1828–1879), a Canadian chemist, geologist, and mineralogist. How was alerted to the unknown mineral by miners in a gypsum quarry, who found it to be a nuisance. He called the new mineral silico-boro-calcite; it was given the name howlite by the American geologist James Dwight Dana shortly thereafter.