Vladimirite

Formula: Ca₅H₂(AsO₄)₄.5H₂O

Origin of name: after locality Vladimirskoe, Russia

Crystal system: Monoclinic

Crystal class: 2/m

Twinning:

Unit cell: a = 5.81, b = 10.19, c = 22.7, β = 97.32°

Colour: Pale rose, colourless, white

Diaphaneity: Transparent to translucent

Luster: Vitreous

Habit: Crystals acicular, in radial aggregates, cross-fiber veinlets and spherulite, to 1 mm

Hardness: 3.5

Specific gravity: 3.14

Cleavage: 1; good

Tenacity: 

Streak: White

Synonyms/varieties:

Comments: