Veatchite

Formula: Sr₂B₁₁O₁₆(OH)₅.H₂O

Origin of name: for John Veach, American

Crystal system: Monoclinic

Crystal class: m

Twinning:

Unit cell: a = 20.81, b = 11.74, c = 6.637, β = 92.2°

Colour: Colourless, white

Diaphaneity: Transparent

Luster: Vitreous, pearly on cleavage, silky in fibrous masses

Habit: crystals platy, elongated or slender prismatic to fibrous, cross-fiber veins and divergent groups

Hardness: 2

Specific gravity: 2.62

Cleavage: 2; {010} perfect, {011} less perfect

Tenacity: 

Streak: White

Synonyms/varieties:

Comments: trimorphous species with the names veatchite, p-veatchite and veatchite-A, all have similar properties but different crystal symmetry, crystal class is given for veatchite