Types de pierresAmazonite
Agates Améthyste Aquamarine Béryl Calcite Chrysocolla Fluorite Grenats Hypersthène Jade Jaspe Océanique Jaspe Paysage Labradorite Lapis Lazuli Larimar Malachite Muscovite Oeil de Tigre Quartz Quartz Rose Rhodocrosite Serpentine Tourmaline Types de produits |
Tourmaline
Variety: Silicate
Hardness: 7 to 7.5 Density: 2.9 to 3.2 Composition: (Na, Ca) (Al, Fe, Mg) (BO3) Si6O18 (OH) 4 Its name comes from tumali, Ceylon gem in Sinhalese. This mineral is very variable in color, usually green very dark or black, but can also be pink, brown yellow and blue.
Its main use is in jewelry. Some crystals generate pressure electric charges (piezoelectricity) and are thus exploited as gauge. References |
Produits de rhodochrositeBague incrustée d'une pierre d'amazonite.
Disponible en ligne. |