anhortite crystal from Anhui in China

anorthite

Detailed sheet

anorthite

,

Discovered on the Vesuvius (Italy) in 1823 by the mineralogist Rose, its name comes from the Greek “not straight” in relation to its triclinic crystals.
It is the calcium end member of the albite-anorthite series of the family of plagioclase feldspar.



CHEMICAL CHARACTERISTICS

Ca[Al2Si2O8]

alumino-calcium silicate



PHYSICAL CHARACTERISTICS

Main color

colourless

Other colors

yellow, pink

Color of streak

white

Luster

vitreous

Hardness

6.0 to 6.5

Density

2.75 to 2.77

Cleavage

perfect

Fracture

uneven

some very tiny parts can be observed on the fracture, easy cleavage on a single side



OPTICAL PROPERTIES

Transparency

translucent, transparent

Refractive index

1.578 - 1.590

Double refraction

0.013

weak biaxial (-)

visible double refraction

No

Pleochroism

absent

Number of colors

1

Fluorescence

none



CRYSTALS PROPERTIES

thick

crystals system

triclinic



OTHER INFORMATIONS



APPROACHING GEMS

vayrynenite, aenigmatite, ilvaite, nephrite, jadeite, augite, zoisite, zircon, yugawaralite, willemite,

Exploited
sites

It is found worldwide, in France at Lassur (Ariege), in the Aveyron, at Tarqmiye in Palestine, in the Taurus Mountains in Turkey, Lybia, Madagascar, Brazil …

use in jewelry

in its most colorful varieties it is faceted cut , it is a collection stone.

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Gems

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