epidote
epidote from Mali withgreen prehnite nodule
crystals of epidote from the Tormak Nala Mine at Iskardu, Pakistan
epidote crystals from Brazil in inclusion in quartz
cleavage like and healing fissures type inclusions
Detailed sheet
epidote
Its name comes from the Greek “epidosis” for generous, that lives largely, referring to its crystalline form, which is a juxtaposition of numerous slender prisms. Its former name, pistachite, was referring to its color.
There are several varieties:
The variety clinozoisite, is a dimorph of zoisite of very light green, iron-poor, with a birefringence of 0.010, we find some in Minerbio (Corsica), Zermatt (Switzerland).
The variety piemontite, red, opaque, rich in manganese, a native of Piedmont (Italy), but found also at the Ile of Groix (Morbihan). This is what gives the color of the red porphyry of Egypt.
The variety tawmawite, emerald green, with a high dichroism emerald green and yellow, containing chromium, originally from Burma (Tawmaw).
The unakite is a rock containing epidote (see unakite)
CHEMICAL CHARACTERISTICS
Ca2(Fe,Al)3[SiO4]3(OH)
calcium aluminium and iron silicate
PHYSICAL CHARACTERISTICS
Main color
green
Other colors
grey, yellow, black, red
its main color is pistachio green but very dark
Color of streak
grey
Luster
greasy, vitreous
Hardness
6.0 to 7.0
Density
3.30 to 3.50
Cleavage
perfect
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.725 - 1.770
Double refraction
0.015
definite, biaxial (-)
visible double refraction
Yes
Dispersion
0.030(0.020)
Pleochroism
strong
Number of colors
3
green, brown, yellow
Absorption spectrum
455
epidote alpha spectrum system
epidote beta spectrum system
Fluorescence
none
CRYSTALS PROPERTIES
thin prisms, elongated ordered in sheafs, sometimes pseudo-octahedral crystals and pseudo-hexagonal
crystals system
monoclinic
OTHER INFORMATIONS
Astrological sign
Capricorn, Leo, Sagittarius, Virgo
APPROACHING GEMS
Exploited
sites
Very common mineral, it is found in France (Bareges, L’Argentiere, Le Bourg d’Oisans …) in the Austrian Alps (Knappenwand, Valley Sulz) and Switzerland, Brazil, United States (Prince of island Wales, Alaska), Pakistan, Kenya, Mexico, Mozambique, Norway, Sri Lanka, Mali associated with prehnite …
use in jewelry
It is only cut as a collection stone and used to shape cameos or objects for shop windows
Daily care
and precautions
fragile, sensitive to shocks but very little to acids
Historical
healing properties
This stone would have a positive influence, it would help to take the situations in life with courage and a in a positive way. It would also act on spirit, help reduce anxiety, stress, grief. It would have a decongestant action on the entire digestive decomposition systems.
Other
Gems
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notre site web
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