Detailed sheet

meionite

Discovered in 1801 by René Just Haüy, its name comes from the Greek in the sense that it would be “less than” … its pyramidal crystals would be less steep than those of vesuvianite. It is found in metamorphic rocks.
The group of scapolites forms a series: the calcium carbonate pole is the meionite, the other sodium pole contains chlorine and it is the marialite.
The wernerite is an intermediate between these two poles.
The meionite density, refractive indices, and birefringence are the highest of the series.



CHEMICAL CHARACTERISTICS

Ca4[Al6SiO24](CO3)

complex calcium silicate



PHYSICAL CHARACTERISTICS

Main color

yellow

Other colors

white, colourless

Color of streak

white

Luster

pearly, resinous, vitreous

Hardness

5.5 to 6.0

Density

2.75 to 0.00

Cleavage

good

Fracture

conchoidal, splintery

pearly on the cleavage



OPTICAL PROPERTIES

Transparency

transparent

Refractive index

1.550 - 1.600

Double refraction

0.024

definite, the most amongst scapolites, uniaxial negative

visible double refraction

Yes

Dispersion

0.016

Pleochroism

absent

Number of colors

1

Fluorescence

none



CRYSTALS PROPERTIES

dipyramids or elongated crystals and fibrous

crystals system

tetragonal



OTHER INFORMATIONS

Exploited
sites

It is found in Brazil (Rio Grande do Norte), in Mogok in Burma, Madagascar, Japan, Italy, near Vesuvius, in the Ticino in Switzerland …

use in jewelry

it is faceted for a nice effect

Daily care
and precautions

fragile due to its medium hardness

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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