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Minerals - Charoite | TerraCollect

Mineral - Charoite

Charoite(K,Na)₅(Ca,Ba,Sr)₈[(OH,F)|Si₆O₁₆|(Si₆O₁₅)₂] · n H₂O

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

(K,Na)₅(Ca,Ba,Sr)₈[(OH,F)|Si₆O₁₆|(Si₆O₁₅)₂] · n H₂O

Unit Cell

Physical Properties

Hardness

5 - 6

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

violet

Birefringence

0.009

Luster

Vitreous

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Point Group

Cleavage

Fracture

Tenacity

monoclinic-prismatic - 2/m

Space Group

P21/m (11)

Habit

fibrous, massive

Formation

By metasomatic alteration of alkali-rich magmatic rocks in the presence of CO2-containing fluids

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Charoite