hiddenite
kunzite from Afghanistan turned green by heat treatment
green hiddenite crystal of Stony Point, North Carolina, United States
cleavage fault ?? type inclusions typical in triangles
Detailed sheet
hiddenite
This is a green variety, colored by chromium, of spodumene which is part of the pyroxene group, although green spodumene without chromium are also called Hiddenite.
Its name honors W. E. Hidden, who discovered it in 1879 in the U.S. (Alexander County, North Carolina United States). By no means its name comes from the place called Hidden, but instead is true the opposite: Hidden took this name because of the discovery Hiddenite by Mr Hidden !
It is also called “triphane” when it is colorless or yellow while purplish pink spodumene is called kunzite, the name Hiddenite is reserved for green spodumene.
CHEMICAL CHARACTERISTICS
LiAl[Si2O6]
lithium aluminium inosilicate
PHYSICAL CHARACTERISTICS
Main color
green
Other colors
yellow
all color shades from yellow to green-emerald due to iron and chromium.
Color of streak
white
Luster
vitreous
Hardness
6.5 to 7.0
Density
3.15 to 3.20
Cleavage
perfect
Fracture
conchoidal, uneven
very easy cleavage
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.660 - 1.680
Double refraction
0.014
definite, biaxial positive
visible double refraction
No
Dispersion
0.017(0.010)
Pleochroism
definite
Number of colors
3
bluish green, emerald green, yellow-green
Absorption spectrum
690 - 686 - 620 - 437
Fluorescence
weak
yellow - orange
Inclusions
pointed arrow or cone-shaped
CRYSTALS PROPERTIES
prismatic and tabular
crystals system
monoclinic
OTHER INFORMATIONS
Astrological sign
Aquarius, Capricorn, Sagittarius
APPROACHING GEMS
Exploited
sites
It is found in granitic pegmatites rich in lithium, in Burma, Brazil (Sapucaia Mines and Minas Novas in Minas Gerais ) , United States (North Carolina, California), Madagascar, Afghanistan (Nuristan, Laghman and Kunar valley).
use in jewelry
To make jewelry, it is carved or faceted in levels but given its pleochroism, the table must be perpendicular to the main axis of the crystal to enhance its color. Its very easy cleavage makes the cut of large stones difficult.
Many green spodumene called “Hiddenite” lose their color nder the light: they are kunzites, heated to turn them green, who lose their artificial green, to light, in a few days as they do not contain chromium which gives them a stable green color. Nevertheless some heated kunzites retain their green color.
Daily care
and precautions
not sensitive to acids and household products, but sensitive to shocks because of its cleavage.
imitations and
treatments
glass and synthetic spinels
Historical
healing properties
Very smooth, it would bring calm, serenity and self-confidence during an examination, an interview. It would help to overcome pains, emotional pain, resented emotions.
It would have a beneficial effect on the digestive system, kidneys and bladder.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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