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Minerals - Halloysite | TerraCollect

Mineral - Halloysite

HalloysiteAl₂(Si₂O₅)(OH)₄

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

Al₂(Si₂O₅)(OH)₄

Unit Cell

Physical Properties

Hardness

1 - 2

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

whiteyellowblue

Birefringence

Luster

Earthy,

Waxy

Transparency

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Cleavage

Fracture

Tenacity

Point Group

Space Group

Habit

coarse, massive

Formation

Metasomatism (from feldspar)

Paragenesis

Twinning

Rarity

Rarely

Synonyms

Halloysite