palygorskite
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
APPROACHING GEMS
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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