My account : Sign in

My orders

Your cart is empty.

Andradite

>> Group(s) : garnets, silicates
See the pictures :

Andradite: this variety of garnet has been described and identified by Dana, its name is a tribute to a Brazilian mineralogist Jose Bonifacio de Andrada e Silva (1763-1838).
Mélanite : black titanoan variety, its name comes from the Greek "black".
Topazolite : yellow variety of andradite going from lemon yellow to yellow or brown, transparent, which owes its color to its close to that of topaz.
Demantoid : discovered in the Ural Mountains area of Russia in the mid nineteenth century, this garnet is the most esteemed, a green chromian variety of andradite, whose name comes from the German "Demant" meaning green gem diamond because it has a shining appearance as a diamond, it was highlighted by the famous Russian jeweler Fabergé.
There are so-called "Mali"garnets going from yellow to green, their chemical composition is close to grossular and andradite and they come from Mali. They are called "grandite", a contraction of grossular and andradite.

Exploited sites

Mélanite: we find this variety of garnet in France (Auvergne), Germany (Baden-Württemberg), United States (Colorado), Italy, Norway, Mali. Topazolite : coming from the USA (California) , Italy (Alps) in Switzerland.
Demantoid : this green garnet comes from Russia (historical deposits in the Urals, inclusions in the typical form of "ponytail"), Italy (Val Malenco), Madagascar where it was discovered in 2009 a new deposit at Ambanja, Namibia (discovered in 1996), Iran, Madagascar, China, Korea, the United States, Zaire.

See pictures of the mines / other pictures

Use in jewelry

Demantoid: popular gem in jewelry because it has a striking appearance, shining like diamonds!
Small size and very expensive, the demantoid gem has been promoted since its discovery by Karl Faberge, goldsmith and jeweler to the Czars, who immediately understood that the exceptional brilliance of this garnet could be put forward in jewelry ... at that time was the only green garnet and its only known deposit was in Russia. It can be replaced by green stones with similar effects such as peridot, tourmaline bottle green, emerald.
The name "diamond in Siberia" or "emerald of the Urals" for demantoid garnet is prohibited. The melanite, black variety, was used to make jewelry for mourning, but is not sought.
The garnet is the stone for the anniversary of the second year of marriage.

Daily care and precautions

Easy to maintain, they can be cleaned very often, insensitive to household products, heat, shock, they are of a proper hardness to be worn as jewels. The Demantoid must be protected from impacts as it is fairly fragile.

Looking alike stones

beryl , chrysoberyl , emerald , grossular , orthoclase , uvarovite , peridot , spinel , titanite , tourmaline

Historical healing properties

As its robust and heavy crystals, black andradite strengthens the will, strength, courage, promotes blood circulation, it symbolizes the Yang in China, is an anchor stone. By strengthening the body, the andradite promotes the ability to arbitration, the decision-making in an independent-minded spirit .
The clear yellow or green stones have a beneficial effect on the liver, gallbladder, intestines in relation with the solar plexus chakra. They are a strong source of energy.

Imitations and treatments

The melanite has been imitated by black glass.

Improvements

The demantoids of the urals can be heat treated to improve the intensity of their green color.

Chemical characteristics
Ca3Fe2[SiO4]3

iron and calcium silicate

Physical characteristics

Main color : black

Other colors : brown, yellow, green

the melanite is black and opaque, the demantoid is green, topazolite is yellow

Color of streak : white

Luster : adamantine, resinous

Hardness : 6.5 to 7.5

Density : 3.70 to 4.10

Cleavage : indistinct

Fracture : conchoidal, uneven

Optical properties

Transparency : transparent, translucent

melanite is black and opaque

Refractive Index : 1.880 - 1.920

Double refraction : 0.000

None, isotropic, sometimes crystals show some polarization anomalies

visible double refraction : no

Dispersion : 0,057

Pleochroism : absent

Number of colors : 1

Isotropic

Absorption spectrum : 701 - 640 - 622 - 443

brown andradite spectrum system

brown andradite spectrum system

demantoide spectrum system

demantoide spectrum system

Fluorescence : none

Sometimes light pink fluorescence for thetsavorites

Inclusions : bissolithe inclusions and / or of chrysotile (asbestos fiber) into "ponytail" characteristic of the Russian demantoid, other solid inclusions. Areas of color enhanced.

Crystals

Well-formed, often very large, hexakis octahedreon, dodecahedra

cristaux

Crystal system : cubic

Other informations

Astrological sign : Capricorn

Chinese astrological sign : Rat

Month : january

For sale in our boutiques
Green Andradite Mali 0.76 ct oval cut €41 excl tax

Andradite Mali
cut oval

41€ excl tax

See all offers
Correspondance
astrological
  • Capricorn Capricorn

It brings moral and physical strength and courage

Chinese astrological sign :
  • Rat Rat

Garnet brings energy, ambition and efficiency. Reduces its suspicious side, manipulative and makes it fun and friendly.