Stibiotantalite

Formula: Sb(Nb,Ta)O₄
Mineral class: oxides
Crystal system: orthorhombic
Mohs scale: 5.5
Density (g/cm³): 6 - 7.40
Refractive index: 2.374 - 2.457
Cleavage: perfect
Colors: yellow, red, greenish, brown
Luster: adamantine - resinous
Fluorescence: -
Pleochroism: -
Largest crystal: 12 cm?
Deposits: worldwide
Discovery: 1893
1st Description: 1944
Name: from the Latin word "stibium" (stibnite / Sb₂S₃), and the mineral's relation to tantalite

Stibiotantalite Mineral

Size: 4.4 x 2.1 x 1.8 cm

Origin: Cryo-Genie Mine / Warner Springs Distr. / San Diego County / California / USA

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Stibiotantalite

Weight: 0.56 ct

Origin: Brazil

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Stibiotantalite

Size: 0.5 x 0.4 x 0.3 cm
Weight: 0.82 ct
Origin: Alto Ligonha / Zambezia Prov. / Mozambique

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Stibiotantalite

Size: 0.61 x 0.44 cm
Weight: 1.30 ct
Origin: Alto Ligonha / Zambezia Prov. / Mozambique

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Stibiotantalite Mineral

Size: 0.7 x 0.3 x 0.2 cm

Origin: Alto Ligonha / Zambezia Prov. / Mozambique

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Stibiotantalite

Size: 0.5 x 0.4 cm
Weight: 1.01 ct
Origin: Alto Ligonha / Zambezia Prov. / Mozambique

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Stibiotantalite Mineral on Rubellite

Size: 1.6 cm
Origin: Himalaya Mine / Mesa Grande / San Diego County / California / USA

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Stibiotantalite

Weight: 0.47 ct

Origin: Himalaya Mine / Mesa Grande / San Diego County / California / USA

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Stibiotantalite Mineral

Size: 1.5 x 1.1 x 1.1 cm

Origin: Alto Ligonha / Zambezia Prov. / Mozambique

Photo by kind permission of www.lucianabarbosa.com