Detailed sheet

palygorskite

Identified in 1862, its name comes from that of a deposit in the Urals in Russia. Sometimes called “angel skin opal” because of its resemblance, but it’s not an opal.



CHEMICAL CHARACTERISTICS

(Mg,Al)2[Si4O10] (OH) - 4H2O

magnesium aluminium hydrated silicate



PHYSICAL CHARACTERISTICS

Main color

yellow

Other colors

white, brown, grey

Color of streak

white

Luster

greasy, resinous

Hardness

1.0 to 2.5

Density

2.20 to 0.00

Cleavage

good

Fracture

uneven

break with very small flat parts



OPTICAL PROPERTIES

Transparency

translucent

Refractive index

1.522 - 1.549

Double refraction

0.000

visible double refraction

No

Pleochroism

weak

Number of colors

2

yellow, yellow - green

Fluorescence

none



CRYSTALS PROPERTIES

prismatic

crystals system

monoclinic, orthorhombic



OTHER INFORMATIONS

Exploited
sites

It is found at Dalnegorsk in Russia, in Japan (Kamaishi Mine, Honshu), Australia (Tasmania and Broken Hill), Slovakia, Hungary, Ecuador, United States (Arizona, Georgia, Washington), the Canada (British Columbia).

use in jewelry

Its resemblance to the opal in its reflections, gave it the appellation of “angel skin opal” but not authorized because it is not an opal. It is cut cabochon.

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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