Analcime

Real mineral · common · NaAlSi₂O₆•(H₂O)

A zeolite that grows in glassy trapezohedra so regular they look machined, lining vesicles in basalt. Rubbed or warmed it takes a weak electric charge, which gave it a name meaning without strength.

Identity

Formula

NaAlSi₂O₆•(H₂O)

Chemical class

silicate

Mineral group

Heulandite, Natrolite, Stilbite

Also known as

Analcite

Crystallography

Crystal system

tetragonal

Habits

cubic, granular, massive

Fracture

conchoidal

Physical properties

Mohs hardness

5

Density

2.3 g/cm³

Luster

vitreous

Colors

white, grayish white, greenish white, yellowish white, reddish white

Streak

white

Transparency

transparent, translucent

Geology

Origins

igneous, hydrothermal, sedimentary

Host rocks

basalt, alkaline lava

Associated minerals

Natrolite, Calcite, Heulandite, Prehnite

Geography

Italy, Iceland, Canada

Classification

Rarity

common

Gem quality

No

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