Priceite

Formula: Ca₄B₁₀O₁₉.7H₂O

Origin of name: for Thomas Price (1837-?), American metallurgist who first analyzed the mineral

Crystal system: Monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: a = 11.623, b = 6.976, c = 12.35, β = 110.7°

Colour: White

Diaphaneity: 

Luster: Earthy

Habit: irregular masses and nodules, soft and chalky to hard and compact

Hardness: 3 to 3.5

Specific gravity: 2.42

Cleavage: 1; {001} perfect

Tenacity: Earthy, clay-like fractures

Streak: White

Synonyms/varieties: Pandermite

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