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Minerals - Pseudomalachite | TerraCollect

Mineral - Pseudomalachite

PseudomalachiteCu₅[(OH)₄|(PO₄)₂]

Chemical Properties

Mineral Class

Phosphates

Toxicity

none

Formula

Cu₅[(OH)₄|(PO₄)₂]

Unit Cell

a=17.08 b=5.77 c=4.50 β=91° Z=2

Physical Properties

Hardness

4.5 - 5

Streak

green

Density

Heavy (3,5-6)

Optical Properties

Color

green

Birefringence

0.076

Luster

Vitreous,

Greasy

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Point Group

Composition

Elements

Mass

P₂O₅

23.86

FeO

0.19

CuO

69.25

H₂O

6.76

Germany (Palache et al. 1952)

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Imperfect after {010}

Fracture

conchoidal,

splintery

Tenacity

Brittle

monoclinic-prismatic - 2/m

Space Group

P21/c (14)

Habit

crusty, spherical, prismatic, tabular, grape-shaped

Formation

Secondarily in the oxidation zone of copper deposits, through the action of phosphate-bearing solutions (often derived from organic material or the weathering of apatite) on primary copper sulfides or carbonates.

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Pseudomalachite