staurolite
staurolite cross twinned crystals from Bretagne in France
twin staurolite of Rubilite in Brazil
twinned in cross staurolite crystals from Brittany in France
Detailed sheet
staurolite
It is named after his twins very frequently cross-shaped: the twin cross of St. Andrew (60 degrees) and that of the Greek cross (90 degrees), in Greek “stauros” means cross and “lithos”, stone, hence its name “cross stone”. Another twin “in wheel”shape exists in the United States in Cherokee, Georgia.
CHEMICAL CHARACTERISTICS
(Fe,Mg,Zn)2Al9[SiO4)]O6 (OH,O)2
iron alumino -silicate
PHYSICAL CHARACTERISTICS
Main color
brown
Other colors
colourless, yellow
Color of streak
white
Luster
resinous, vitreous
Hardness
7.0 to 7.5
Density
3.65 to 3.78
Cleavage
good
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
opaque, translucent, transparent
Refractive index
1.735 - 1.763
Double refraction
0.010
weak, biaxial (+)
visible double refraction
No
Dispersion
0,023(0.012)
Pleochroism
strong
Number of colors
3
colorless to light - yellow, orange, brown - red
Fluorescence
none
CRYSTALS PROPERTIES
often in cruciform twins
crystals system
monoclinic
OTHER INFORMATIONS
Astrological sign
Gemini, Leo
APPROACHING GEMS
Exploited
sites
It is found in cruciform twinned crystals in France, in Brittany near Quimper, Scaer, Coray, Baud and Locminé and also in the Gotthard massif in Switzerland, in Italy, United States (Cherokee, Georgia). Some transparent varieties come from Brazil.
use in jewelry
Its main use was to be worn as a pendant because of its cross-shape. It was even thought that they were remnants of Celtic crosses dating from that period as it was found plowing in the fields …
It is now faceted for its gems varieties, it is a collection stone.
Daily care
and precautions
Vigorous washing with soap and brush when it is found in soil.
Do not allow contact with sea water which it oxides it.
Historical
healing properties
It would be the luck stone, it would protect explorers, adventurers and sailors. It is related to the root chakra, it would be a stone that rooting would have beneficial effects on physical and mental balance. In connection with the heart chakra, would help to find the way, the right orientation. It would create an atmosphere allowing to concentrate and focus on the goals.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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