gypsum
twinned gypsum crystals form Perou
Detailed sheet
gypsum
The exact origin of his name still appears uncertain. The Greek word “gypsos”, meaning “plaster”, and would decompose into “ge” for “ stone “, and “Ipson” for “burn”. The origin of the word would rather be Semitic. In Latin, gypsum, in old French was called gip. This is the plaster stone, heated gypsum becomes plaster, which mixed with sand had formed the first mortars used for the Egyptian pyramids. The fibrous form, called selenite, presents a chatoyancy effect. Gypsum is the standard hardness 2 on the Mohs hardness scale ranging from 1 (talc) to 10 (diamond).
CHEMICAL CHARACTERISTICS
Ca[SO4] - 2H2O
hydrated calcium sulfate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
white, blue, brown, grey, pink, green
Color of streak
white
Luster
pearly, vitreous
Hardness
2.0 to 0.0
Density
2.20 to 2.40
Cleavage
perfect
Fracture
splintery, uneven
cleaves in sheets, strips
OPTICAL PROPERTIES
Transparency
translucent, transparent
often completely transparent
Refractive index
1.520 - 1.530
Double refraction
0.009
weak, biaxial (+)
visible double refraction
No
Dispersion
0.035(0.010)
Pleochroism
very weak
Number of colors
1
Fluorescence
variable
yellow, orange, greenish
Inclusions
liquid inclusions
CRYSTALS PROPERTIES
may exceed 10 meters, often twinned, spearheaded ...
crystals system
monoclinic
OTHER INFORMATIONS
Astrological sign
Libra, Taurus
APPROACHING GEMS
Exploited
sites
Mineral spread worldwide.
In France the quarries of Montmartre in Paris produced enormous amount of gypsum. The quarry of Caress – Cassaber in the Pyrenees produced crystals more than 1 meter long( 1Mt = 1.09 Yds ).
The record being held by the giant crystals of the Naica Mine, Chihuahua, Mexico: they exceed 10 meters (10.9 Yds)
use in jewelry
collection stone, heat sensitive and very fragile
Historical
healing properties
Its variety called “spearhead” has long been compared to the shape of a compass needle and it was awarded the power to help navigation and find the way. The fibrous gypsum, it would help to follow this path. In general, the gypsum is related to the root chakra and would help to refocus energies.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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