Stone, minerals and semiprecious of the world stone
Pyroxene (silicates): Diopside -->rus
Diagnostic cart.
On a photo. Varieties of diopside - mussite (down) and violane (above).
Ca Mg Si2 O6
Crystal structure monoclinic
Hardness on the Mohs scale 6
Specific unit weight mass 3,2-3,3
Cleavage perfect absolute
Fracture, break wrong
Colors colourless, polycoloured (multicoloured)
Colors in powder triturate white
Glance (glitter, glare) glassy
Diopside together with fassaite, pyrgom, belongs a hedenbergite and omphacite to the number Pyroxene of metamorphic rocks. Silicate of calcium and magnesium. Glance (glitter, glare) glassy. Transparent in shallow fragments, rarer transparent. Fracture, break uneven, rough. Appears in skarn and metamorphic rocks. Crystals (monoclinic Crystal structure) more frequent than all are prismatic or columnar, basaltiform with an almost square section. Usually pole and continuous or grainy aggregates. Places of distribution: Saxony (Germany), Alps, Vesuvius (Italy), Sweden, California (USA), to the CIS - Ural (Russia).
Deposit minefield mine field occurrence subsoil of jeweller diopside are in Burma, India, on Madagascar, in Republic of South Africa, Finland (Outokumpu), Italy (P'emont), Austria (Cillertal'), CIS (Aldan). Pyroxene is rockforming igneous eruptive volcano mineral, being silicate of magnesium, iron and calcium.
Star-shaped Diopside is most valued, diopside Cat's Eye and emerald-green Chromediopside. A dense violaceous-dark blue fine-grained variety from P'emonta (Italy) is named виоланом. Entangling Diopside is possible with hiddenite, peridotite, emerald, vesuvianite.
Crystallized as short-prismatic individuals, rich in verges, in a section almost square or octagonal. More frequent be found as grainy, radially-radiant and platy aggregates. Colouring is changeable (colourless, white, grey, green, yellow-brown). Glance (glitter, glare) glassy; mineral is fragile and easily divided on cleavage.
The row of diopside is completed a hedenbergite which is a ferrous difference, and Johannsenite manganese-ferrous. All of three minerals are a row of isomorphous substitutions. The variety of violane (getting the name for the dark violet-blue tint of the extraordinarily rare crystals) is used on jeweller business.
Chemical composition (chemistry, compound)-maintenance (in %): CaO- 25,9; MgO-18,5; SiO,-55,6; the admixtures of iron, manganese, aluminium, chrome, vanadium, titan are ordinary. Prismatic type of symmetry. Cleavage - clear to on (100); often separateness to on (001). Diopside - it mineral from the group of Pyroxene. It can have the different colouring, which is created the admixtures of iron, manganese, vanadium and chrome.
Be found as short-prismatic, rarer than plate tablet lamellar crystals with main simple forms: (100}, (010), (111), (001), (101), (221), (310). Often there are twins to on (100) (polysynthetic), (101) and (122).
Diagnostic indication.
Does not dissolve in muriatic acid and not melt fuse in flame of candle.
Origin provenance genesis.
Diopside - widespread mineral, which be found mainly in metamorphic rocks, rich in a calcium, rodingite and other ultrabasic and basic rocks.
Deposit minefield mine field occurrence subsoil.
The exceptional well bought up crystals meet in alpine родингитах in Val'-d'ala (a province is Turin), Antona-p'yana, Ossola (province of Verbaniya), to Bella-Koste (Aosta). Found out Diopside also in Val'-malenko (province of Sondrio), Adamello and on Monte-Somma (Vesuvius). In Europe it is found on Ural (Russia, CIS), in austrian Tyrol, Finland and Sweden (EU). From Sonth India all over the world unique black stone go away with the mysterious game of light - at the point source of illumination on them a quadriradiate star light of which goes from the depth of stone and moves with his motion and turns begins to shine. Diopsidy obtain also in Burma, Italy, Canada.
Use, practical application, deployment.
Diopside is of interest mainly for scientists and collectors. But if it is transparent, it can be used and on jeweller business.
