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Howlite

Howlite

Howlite, a calcium borosilicate hydroxide, is a borate mineral found in evaporite deposits. Wikipedia
Density: 2.58
Category: Inoborates
Color: White, colorless
Crystal system: Monoclinic
Luster: Subvitreous, glimmering
Optical properties: Biaxial (−), colorless (transmitted light)
Refractive index: nα = 1.583 – 1.586 nβ = 1.596 – 1.598 nγ = 1.600