Wickenburgite

Formula: Pb₃CaAl₂Si₁₀O₂₄.3H₂O

Origin of name: after locality, the Potter-Cramer claim, near Wickenburg, Maricopa Co., Arizona, U.S.A.

Crystal system: Trigonal

Crystal class: 3m

Twinning:

Unit cell: a = 8.56, c = 20.19

Colour: White, colourless, pink

Diaphaneity: Transparent to translucent

Luster: Vitreous

Habit: crystals tabular, 0.2 to 1.5 mm

Hardness: 5

Specific gravity: 3.85

Cleavage: 2; {0001} distinct, ? indistinct

Tenacity: Brittle but tough

Streak: White

Synonyms/varieties:

Comments:  Fluorescent, SW-UV dull orange