Genuine Serpentine Necklace Pendant From Ural Mountains, Russia

Description

Natural pendant made of serpentine mineral. Some information about serpentine: Serpentine is a major rock forming mineral and is found as a constituent in many metamorphic and weather igneous rocks. It often colors many of these rocks to a green color and most rocks that have a green color probably have serpentine in some amount. Serpentine's structure is composed of layers of silicate tetrahedrons linked into sheets. Between the silicate layers are layers of Mg(OH)2. These Mg(OH)2 layers are found in the mineral brucite and are called brucite layers. How the brucite layers stack with the silicate layers is the main reason for the multiple polymorphs. The stacking is not perfect and has the effect of bending the layers. In most serpentines, the silicate layers and brucite layers are more mixed and produced convoluted sheets. In the asbestos varieties the brucite layers and silicate layers bend into tubes that produce the fibers. Serpentine can be an attractive green stone that takes a nice polish and is suitable for carving. It has been used as a substitute for jade and is sometimes difficult to distinguish from jade, a testament to the beauty of finer serpentine material. PHYSICAL CHARACTERISTICS: Color is olive green, yellow or golden, brown, or black. Luster is greasy, waxy or silky. Transparency crystals are translucent and masses are opaque. Crystal System is variable, see above. Crystal Habits: never in large individual crystals, usually compact masses or fibrous. Veins of viberous serpentine can be found inside of massive serpentine or other rocks. Cleavage the varieties of crysotile have none, in lizardite and antigorite it is good in one direction. Fracture is conchoidal in antigorite and lizardite and splintery in the crysotiles. Hardness is 3 - 4.5