Stone, minerals and semiprecious of the world stone
Garnets (silicates): Arizona ruby, Pyrope -->rus
Diagnostic cart.
Crystals of Pirope are in containing mass - as well as all of Garnets, this mineral is presented the well-shaped crystals.
Mg3 Al2 (SiO4)3
Crystal structure cube
Hardness on the Mohs scale 7-7,5
Specific unit weight mass 3,58
Cleavage non-existent
Fracture, break rough
Colors red
Colors in powder triturate white
Glance (glitter, glare) glassy
Arizona ruby, Pirope, the name of which happened from greek pyros is a fire, was a favourite stone in XVIII-XIX century. His most considerable deposits are in Czekh, Republic of South Africa, Australia. Outwardly it looks like almandine, Spinel, ruby. Rodolit is an intense-pinkish variety of Pirope. Deposit minefield mine field occurrence subsoil him known in the USA (state North Carolina), Sri Lanka, Brazil. To Zambia, Tanzania, Republic of South Africa.
Crystals have a perfect geometrical type: most often there are a cube and rhombic-dodecahedron shape (diamond forms). In Pirope often there are different inclusion, including crystals of apatite, black opaque plates of ilmenite, rounded inclusion Pyrite and Pyrrotine; reported about including of needle-shaped rutile and black sphalerite. Liquid inclusion does not meet. Colouring is intensive red, sometimes very thick. Piropa has high hardness, that hampers his use on jeweller business.
Diagnostic indication.
Arizona ruby, Pirope in ultraviolet rays not fluorescent. Noticeable dispersion of light gives this semiprecious stone off-gloss.
Origin provenance genesis.
It typical mineral peridotite, intrusion, irruption orthorocks of ultrabasic composition, enriched magnesium, and serpentinite, appearing to on by him.
Arizona ruby, Pirope (crystals to 3-4 sm). Dora-mayra, array, 70 km to to YUZ from Turin, Pyemont. Italy (EU). A photo: © A.A. Evseev.
Arizona ruby, Pirope (white). More than 7 sm of Kase-ramello, Dora-mayra array, to On, Pyemont. Italy (EU). A photo: © A.A. Evseev.
Deposit minefield mine field occurrence subsoil.
The most famous deposits are in Bohemia (Czekh): the places of booty are located on the north slopes of the Czech-moravian array, in the mine of Lingorke and in alluvial sands of Shtifelberg. Matter very much also deposit in South Africa, Tanzania, Sri Lanka and Scotland.
The use is on jeweller business.
The most widespread cutting foresees a protuberant curve topside and concave lower, due to what colouring of stone acquires more light style. Arizona ruby, Pirope is used also as polishing powder at treatment of minerals of enhanceable hardness.
Arizona ruby, Pirope. Matarchuna, Yakutia, Russia (CIS).
Arizona ruby, Pirope (~1 sm) in a kimberlite. Novelty, kimberlite tube, Yakutia, Russia (CIS). A photo: © A.A. Evseev.
