Boracite

Formula: Mg₃B₇O₁₃Cl
Mineral class: borates
Crystal system: orthorhombic
Mohs scale: 7 - 7.5
Density (g/cm³): 2.9 - 3
Refractive index: 1.658 - 1.673
Cleavage: -
Colors: colorless, white, grey, yellow, orange, brown, light blue, greenish
Luster: vitreous - adamantine
Fluorescence: -
Pleochroism: -
Largest Boracite: 2.5 cm?
Deposits: Australia, Bolivia, Canada, Colombia, France, Germany, Kazakhstan, Poland, England, USA
1st Description: 1951
Name: for boron in the composition

Boracite Mineral

Origin: Harz Mts. / Germany

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Boracite

Size: 0.55 x 0.47 cm
Weight: 0.57 ct
Origin: Germany

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Boracite Mineral

Size: 5.0 x 4.8 x 4.7 cm

Origin: Alto Chapare / Cochabamba Dep. / Bolivia

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Boracite Mineral

Origin: Boulby Mine / Loftus / Cleveland / Great Britain

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Boracite Mineral

Origin: Kalkberg Mt. / Lüneburg / Lower Saxony / Germany

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Boracite Mineral

Size: max. 0.32 cm

Origin: Kalkberg Mt. / Lüneburg / Lower Saxony / Germany

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Boracite Mineral

Size: 5 x 3 x 2.5 cm, Crystal: 0.5 cm

Origin: Bernburg / Sachsen-Anhalt / Germany

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Boracite

Size: 0.54 cm
Weight: 0.48 ct
Origin: Kalkberg Mt. / Lüneburg / Lower Saxony / Germany

Photo by kind permission of © Darlene Cobler

Boracite Mineral

Origin: Boulby Mine / Loftus / Cleveland / Great Britain

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Boracite Mineral

Size: 5.0 x 4.8 x 4.7 cm

Origin: Alto Chapare / Cochabamba Dep. / Bolivia

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