Vistepite

Formula: Mn₅SnB₂Si₅O₂₀

Origin of name: for V.I. Stepanov, Russian mineral curator

Crystal system: Monoclinic

Crystal class: 2/m

Twinning: polysynthetic parallel to elongation

Unit cell: a = 28.77, b = 7.01, c = 13.72, β = 96.6°

Colour: Orange-yellow

Diaphaneity: Transparent

Luster: Vitreous

Habit: radial aggregates to 15 mm

Hardness: 4.5

Specific gravity: 3.67

Cleavage: 3; perfect

Tenacity: Brittle

Streak: White

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