Stibiocolumbite

Formula: SbNbO4

Origin of name: from Latin stibium = antimony and columbite

 

Crystal system: orthorhombic

Crystal class: mm2

Twinning:

Unit cell: 

 

Colour: brown, reddish brown, brownish yellow

Diaphaneity: translucent, transparent in thin fragments

Luster: adamantine to resinous

Habit: crystals prismatic, vertically striated, twinned

Hardness: 5.5

Specific gravity: 5.98

Cleavage: 2; {010} distinct, {100} indistinct

Tenacity: 

Streak: yellow brown

 

Synonyms/varieties:

 

Comments: series with stibiotantalite

 

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