creedite
creedite crystals from mexico
Detailed sheet
creedite
Described in 1916 by Larsen and Wells, it owes its name to the town of Colorado (USA) where it has been identified: Creede quadrangle.
It is a calcium sulfate and hydrated aluminum fluoride.
CHEMICAL CHARACTERISTICS
Ca3Al2[SO4](F,OH)10 - 2(H2O)
calcium aluminium flouro sulfate mineral
PHYSICAL CHARACTERISTICS
Other colors
white, grey, colourless, yellow, purple
Color of streak
white
Luster
greasy, vitreous
Hardness
3.5 to 4.0
Density
3.70 to 3.80
Cleavage
perfect
Fracture
conchoidal
fragile easy cleavage
OPTICAL PROPERTIES
Transparency
transparent
often many internal fractures
Refractive index
1.460 - 1.490
Double refraction
0.022
definite, biaxial (-)
visible double refraction
Yes
Dispersion
+
Pleochroism
variable
Number of colors
2
weak pleochroism visible in the colored crystals
Fluorescence
weak
white - bluish
CRYSTALS PROPERTIES
short prismatic or acicular tufts
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It occurs in hydrothermal veins rich in fluorides of fluorite and barite deposits. The deposit that produces the most colorful crystals is in Mexico near Durango (Mina Navidad).
It is also found in South Africa, Kazakhstan (Mine Aqshatau, Karangandy region), in Tajikistan in Badakhshan, in China (Guizhou Province, in Bolivia, in Sardinia – Italy, in Greece in Laurium, in France in Alsace near Bergheim and Orschwiller, in the United States (Arizona, Nevada, Colorado, California and New Mexico)
use in jewelry
cut in facets it is only a collection stone
Daily care
and precautions
Very fragile because of its brittle cleavage and low hardness.
Historical
healing properties
It would be a spiritual stone facilitating spiritual openness and the removal of psychological barriers that limit us. It would encourage intuition and spiritual development. It would be in relation to the crown chakra.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo consectetur adipiscing elit. Ut elit tellus, luctus nec.
