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

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

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notre site web

voillot-joaillier.fr

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