grossular
African grossular garnet crystal
tsavorite garnet crystal of Tanzania
grossular garnet crystal from mali
crystal of pink grossular garnet from Mexico
hessonite crystal from Bajour in Pakistan
pink grossular garnet from Sierra Mojada in Mexico
liquid type inclusions, healing fissures in a tsavorite grossular garnet
solid like inclusion, apatite in hessonite
liquid like inclusions
solid like inclusions in a grossular from Mali
Detailed sheet
grossular
Its name recalls the color of the gooseberry.
Hessonite variety: it is the most renowned, also known as cinnamon stone or garnet hyacinth, name not to be used, it is a variety of grossular of dark orange color.
Tsavorite: variety of grossular going from green to emerald green intense (its color is due to vanadium and chromium) sometimes called “tsavolite”, discovered in 1974 in Kenya in the Tsavo Park and Tanzania. It has a luster and a superior strength to emerald.
Hydrogrossular variety: isolated as a species of its own, close to grossular, in 1984, it may be pink, green, colorless or yellow, it is a calcium and aluminum silicate, such as grossular but hydrated, it is also called katoite or hibschite.
Some green-yellow grossular garnets are from Mali, by their chemical composition they are in between grossular and andradite. They are called “grandite”, a contraction of grossular and andradite.
CHEMICAL CHARACTERISTICS
Ca3Al2[SiO4]3
calcium aluminium silicate
PHYSICAL CHARACTERISTICS
Main color
orange
Other colors
brown, colourless, pink, green
all shades from light yellow, orange, brown and green
Color of streak
white
Luster
resinous, vitreous
Hardness
6.5 to 7.5
Density
3.57 to 3.75
Cleavage
indistinct
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.730 - 1.760
Double refraction
0.000
none, but sometimes isotropic crystals show some polarization anomalies
visible double refraction
No
Dispersion
0.020(0.012)
Pleochroism
absent
Number of colors
1
Absorption spectrum
630 - 605 - 505
701.640.622.443 for demantoid. 435 for hessonite
orange grossular spectrum system
green grossular from mali spectrum system
orange grossular spectrum system
Fluorescence
variable
Inclusions
small colorless crystals and eroded (hessonite), fissures of liquid particles (tsavorite)
CRYSTALS PROPERTIES
sometimes very pure crystals and well shaped in isometric- hexoctahedral
crystals system
cubic
OTHER INFORMATIONS
Astrological sign
Aries, Capricorn, Leo, Scorpio, Virgo
Month
january
Chinese astrological sign
Rat
APPROACHING GEMS
Exploited
sites
Grossular: found in South Africa, Canada, United States, Kenya, Mali, Pakistan, Russia (Siberia), Sri Lanka, Tanzania. Hessonite variety: it is found in Sri Lanka , Brazil, Canada, United States, India, Madagascar, Tanzania. Tsavorite: found in Kenya and Tanzania. Katoite : the new variety is colorless, of a very similar composition, discovered by a Japanese mineralogist, Akira Kato, in Italy.
use in jewelry
The tsavorite is increasingly used in jewelry because of its emerald green color, its brilliance and hardness. Pure gems of large size are rare. Garnet is the stone for the anniversary of the second year of marriage.
Daily care
and precautions
Easy to care of, resistant to pressure. It may be washed with water mixed with dishwashing liquid, rinse with pure water and then with alcohol.
imitations and
treatments
zirconium oxide stained, YAG, colored lenses, doublets.
Historical
healing properties
It is often called “anti-fear stone”, its robustness would give it this power. When it’s orange: it is an energy stone, it is invigorating both mentally and physically.
The tsavorite, the green garnet, would deliver a great power in a short time, would favor the development of intellectual faculties in harmony with the physical development.
Other
Gems
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