Wheatleyite

Formula: Na₂Cu(C₂O₄)₂.2H₂O

Origin of name: from locality Wheatley mine, Phoenixville, Pennsylvania, U.S.A.

Crystal system: Triclinic

Crystal class: 1

Twinning:

Unit cell: a = 7.559, b = 9.665, c = 3.589, α = 76.65°, β = 103.67°, γ = 109.1°

Colour: Bright blue

Diaphaneity: Transparent

Luster: Vitreous

Habit: crystal acicular, in aggregates

Hardness: 1 to 2

Specific gravity: 2.27

Cleavage: 1; {100} perfect

Tenacity: 

Streak: Light blue

Synonyms/varieties:

Comments: