Loading data...

Impressum Privacy Policy

© 2026 TerraCollect

0.2.41

Minerals - Turquoise | TerraCollect

Mineral - Turquoise

TurquoiseCuAl₆(PO₄)₄(OH)₈ · 4H₂O

Chemical Properties

Mineral Class

Phosphates

Toxicity

none

Formula

CuAl₆(PO₄)₄(OH)₈ · 4H₂O

Unit Cell

a=7.41 b=9.91 c=7.64 α=111° β=115° γ=70° Z=1

Physical Properties

Hardness

5 - 6

Streak

whitegreengreen white

Optical Properties

Color

greenblue

Birefringence

0.040

Luster

Waxy

Transparency

translucent,

transparent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

triclinic

Composition

Elements

Mass

P₂O₅

34.13

Al₂O₃

36.50

Fe₂O₃

0.21

CuO

9.00

H₂O

20.12

Virginia (Palache et al. 1952)

Groups and Members

Turquoise-Group

Karten-Ebenen

Geologische KarteSatelliten Karte

Density

Normal (2-3,5)

Cleavage

Perfect after {001}, distinct after {010}

Fracture

conchoidal,

uneven

Tenacity

Brittle

Point Group

triclinic-pinacoidal - 1

Space Group

P1 (2)

Habit

coarse, earthy, spherical, massive, grape-shaped

Formation

Secondary, in the oxidation zone of supergene deposits, where copper-bearing rocks react with phosphate-bearing surface waters in arid to semiarid climates

Paragenesis

Twinning

Rarity

Common

Synonyms

Turquoise