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Minerals - Aluminite | TerraCollect

Mineral - Aluminite

AluminiteAl₂[(OH)₄|SO₄]·7H₂O

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Chemical Properties

Mineral Class

Sulphates

Toxicity

none

Formula

Al₂[(OH)₄|SO₄]·7H₂O

Unit Cell

a=7.44 b=15.58 c=11.70 β=110° Z=4

Physical Properties

Hardness

1 - 2

Streak

white

Density

Light (<2)

Optical Properties

Color

white

Birefringence

0.011

Luster

Earthy

Transparency

opaque

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Point Group

Composition

Elements

Mass

SO₃

23.37

Al₂O₃

29.87

H₂O

46.76

England (Palache et al. 1952)

Groups and Members

Aluminite-Group

Map-Layer

Geological MapSatellite Map

Name and first discovery : Named for its chemical composition, in which aluminium is the main cation. First described in 1805 by Karl Konstantin Haberle (1764-1832) from its type locality in Germany.

Abbreviation : A

literature

Palache, C., Berman, H., & Frondel, C. (1952). Dana's system of mineralogy. Geologiska Föreningen i Stockholm Förhandlingar , 74 (2), 218-219.

Cleavage

Fracture

earthy

Tenacity

Brittle

monoclinic-prismatic - 2/m

Space Group

P21/c (14)

Habit

earthy, bulbous, kidney-shaped, grape-shaped

Formation

Reaction of sulphate-containing solutions (from the decomposition of marcasite or pyrite) at moderate temperatures with Al-containing silicates

Paragenesis

Twinning

Rarity

Common

Synonyms

Aluminite, Hallite