Abhurite

Formula: Sn₂₁O₆(OH)₁₄Cl₁₆

Origin of name:  from Sharm Abhur, Saudi Arabia, where it was discovered

Crystal system:  Hexagonal

Crystal class:  32, 3m or -3 2/m

Twinning: on {0001}

Unit cell: a = 10.017 Å, c = 44.014 Å

Colour:  Colourless

Diaphaneity: Transparent

Luster:  Opalescent

Habit:  Platy, hexagonal, twinned to 1.5 mm, in cryptocrystalline crusts

Hardness:  2

Specific gravity:  4.42 (synthetic)

Cleavage:  None

Tenacity: Fragile

Streak:  White

Synonyms/varieties:

Comments: Found in blisterlike protuberances on the surface of a tin ingot recovered from a ship wrecked possibly 100 years ago at Sharm Abhur cove, Saudi Arabia.