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Analcime

>> Group(s) : silicates, zeolites
See the pictures :

Identified in 1797 by René Just Haüy, its name comes from the Greek "analkimos" which means "weak -that has no force".
It is one example of a mineral that crystallizes in several crystal systems according to the order taken by its atoms .... it can be cubic, tetragonal, orthorhombic, and monoclinic too!

Exploited sites

It is found like other zeolites in basalt cavities , in France in the Puy de Dome, in India (Poona), Paraguay, Brazil, Greenland, Alaska, Hawaii, Russia (Urals)…

See pictures of the mines / other pictures

Use in jewelry

Faceted when it is transparent or cabochon cut when translucent It is a collection stone.

Daily care and precautions

Fragile because of its low hardness.

Looking alike stones

albite , calcite , danburite , datolite , kunzite , leucite , orthoclase , petalite , phenakite , phosgenite , pollucite

Chemical characteristics
Na2[Al2Si4O12] 2H2O

hydrated sodium aluminium silicate

Physical characteristics

Main color : colourless

Other colors : white, grey, yellow, orange, pink, green

colored stones are the most sought

Color of streak : white

Luster : vitreous, pearly

Hardness : 5.0 to 5.5

Density : 2.20 to 2.30

Cleavage : indistinct

Fracture : uneven

Optical properties

Transparency : transparent, translucent

Refractive Index : 1.478 - 1.490

Double refraction : 0.001

Practically none

visible double refraction : no

Dispersion : -

Pleochroism : absent

Number of colors : 1

Fluorescence : weak

Colors green, blue, yellow, depending on the origins

Crystals

Well formed, multi-faceted.

cristaux

Crystal system : triclinic

Variable depending on temperature

Other informations
For sale in our boutiques
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