solid like inclusions : ilmenite and rutile with labradorescence
labradorite
labradorite from Mexico
cabochon of labradorite from Madagascar with labradorescence
red labradorite from Congo
cut labradorite from Madagascar
labradorescence of labradorite
parallel growth tubes – type inclusion
solid like inclusions : ilmenite and rutile with labradorescence
labradorite
Detailed sheet
labradorite
This plagioclase was discovered in 1770 in the Labrador region in Canada, which gave it its name. It is part of the albite-anorthite series.
Its characteristic is a set of iridescent colors that can be observed by changing its position relatively to the light, this phenomenon is called “labradorisation” labradorescence or Schiller effect. There all the colors of the spectrum with blue and green dominants.
The spectrolite is a variety from Finland which has a broader range of colors, often compared to the colors of the aurora borealis.
There is a variety practically transparent, with hints of light blue, from Madagascar, mistakenly called “black moonstone”.
Varieties of red and green gems have been discovered recently. The red variety is so much like the red andesine, that experts wondered if it was not it…! because the chemical composition of andesine and labradorite are very close. Based on the chemical composition, it seems now admitted that these are two different minerals.
CHEMICAL CHARACTERISTICS
(Na,Ca)[Si,Al)4O8]
alumino-silicate of calcium and sodium
PHYSICAL CHARACTERISTICS
Main color
grey
Other colors
blue, grey, colourless, yellow, black, red, green
bluish features called
Color of streak
white
Luster
vitreous
Hardness
6.0 to 6.5
Density
2.65 to 2.75
Cleavage
perfect
Fracture
uneven
very easy cleavage
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.555 - 1.572
Double refraction
0.008
weak, biaxial (+)
visible double refraction
No
Dispersion
0.019(0.010)
Pleochroism
absent
Number of colors
1
Fluorescence
very weak
rarely flourescent sometimes pale yellow
Inclusions
sometimes small dotted inclusions of magnetite, graphite, hematite, goethite, copper
CRYSTALS PROPERTIES
flattened prismatic
crystals system
triclinic
OTHER INFORMATIONS
Astrological sign
Gemini, Libra, Pisces, Virgo
APPROACHING GEMS
Exploited
sites
It is found in Europe in France (St. Pierre Eynac in the Haute-Loire, Salau in the Ariege, the Col de l’Escrinet, Ardeche), Slovakia (Kosice, Banska Bystrica), Italy (Tuscany, Sicily , Lombardy), Canada, Finland, Australia, Madagascar, Mexico, United States (Arizona, California, Oregon), Russia (Siberia), Démocatique Republic of Congo, Zambia, Zimbabwe.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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