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Encyclopedia > Diopside
Diopside
Diopside

Diopside is a monoclinic pyroxene mineral with composition MgCaSi2O6. It forms complete solid solution series with hedenbergite (FeCaSi2O6) and augite, and partial solid solutions with orthopyroxene and pigeonite. It forms variably colored, but typically dull green crystals in the monoclinic prismatic class. It has two distinct prismatic cleavages at 87 and 93° typical of the pyroxene series. It has a Mohs hardness of six and a specific gravity of 3.25 to 3.55. It is transparent to translucent with indices of refraction of nα=1.663 - 1.699, nβ=1.671 - 1.705 and nγ=1.693 - 1.728. The optic angle is 58° to 63°. Image File history File linksMetadata Size of this preview: 614 × 599 pixel Image in higher resolution (1340 × 1308 pixel, file size: 1. ... Image File history File linksMetadata Size of this preview: 614 × 599 pixel Image in higher resolution (1340 × 1308 pixel, file size: 1. ... In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ... Figure 1:Mantle-peridotite xenolith with green peridot olivine and black pyroxene crystals from San Carlos Indian Reservation, Gila Co. ... Minerals are natural compounds formed through geological processes. ... Hedenbergite, or calcium iron pyroxene, is a black mineral closely allied to diopside and, owing to the isomorphous replacement of iron by magnesium, there is no sharp line of division between them. ... Augite is a mineral described chemically as (Ca, Na)(Mg, Fe, Al)(Al, Si)2O6 or calcium sodium magnesium iron aluminium silicate. ... Figure 1:Mantle-peridotite xenolith with green peridot olivine and black pyroxene crystals from San Carlos Indian Reservation, Gila Co. ... This page meets Wikipedias criteria for speedy deletion. ... In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... The refractive index (or index of refraction) of a material is the factor by which the phase velocity of electromagnetic radiation is slowed in that material, relative to its velocity in a vacuum. ...


Diopside is found in ultramafic (kimberlite and peridotite) igneous rocks, and diopside-rich augite is common in mafic rocks, such as olivine basalt and andesite. Diopside is also found in a variety of metamorphic rocks, such as in contact metamorphosed skarns developed from high silica dolomites. It is an important mineral in the Earth's mantle and is common in peridotite xenoliths erupted in kimberlite and alkali basalt. Ultramafic (or ultrabasic) rocks are igneous rocks with very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium and are composed of usually greater than 90% mafic minerals (dark colored, high magnesium and iron content). ... Hewn kimberlite core sample from the James Bay Lowlands region of Northern Ontario, Canada. ... Peridotite xenolith from San Carlos, southwestern United States. ... Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... The rocky side of a mountain creek near Orosí, Costa Rica. ... In geology, mafic minerals and rocks are silicate minerals, magmas, and volcanic and intrusive igneous rocks that have relatively high concentrations of the heavier elements. ... Basalt Basalt (IPA: ) is a common gray to black volcanic rock. ... A sample of andesite (dark groundmass) with amygdaloidal vesicules filled with zeolite. ... Quartzite, a form of metamorphic rock, from the Museum of Geology at University of Tartu collection. ... Skarn is a fine grained metamorphic rock that is usually variably colored green or red, occasionally grey, black, brown or white. ... Dolomite crystals from Touissite, Morocco Dolomite is the name of both a carbonate rock and a mineral consisting of calcium magnesium carbonate (formula: CaMg(CO3)2) found in crystals. ... Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ... Earth cutaway from core to exosphere. ... Peridotite xenolith from San Carlos, southwestern United States. ... A xenolith A xenolith (Greek: foreign rock) is a rock fragment which becomes enveloped in a larger rock during the latters development and hardening. ... Hewn kimberlite core sample from the James Bay Lowlands region of Northern Ontario, Canada. ... Basalt Basalt (IPA: ) is a common gray to black volcanic rock. ...


At relatively high temperatures, there is a miscibility gap between diopside and pigeonite, and at lower temperatures, between diopside and orthopyroxene. The calcium/(calcium+magnesium+iron) ratio in diopside that formed with one of these other two pyroxenes is particularly sensitive to temperature above 900°C, and compositions of diopside in peridotite xenoliths have been important in reconstructions of temperatures in the Earth's mantle. This page meets Wikipedias criteria for speedy deletion. ... Figure 1:Mantle-peridotite xenolith with green peridot olivine and black pyroxene crystals from San Carlos Indian Reservation, Gila Co. ... General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Atomic mass 40. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... Earth cutaway from core to exosphere. ...


Gemstone quality diopside is found in two forms: the black star diopside and the chrome diopside (which includes chromium giving it a rich green colour). At 5.5-6.5 on the Mohs scale, chrome diopside is relatively soft to scratch. Mohs scale of hardness does not measure tensile strength or resistance to fracture. A selection of gemstone pebbles made by tumbling rough rock with abrasive grit, in a rotating drum. ... General Name, Symbol, Number chromium, Cr, 24 Chemical series transition metals Group, Period, Block 6, 4, d Appearance silvery metallic Atomic mass 51. ...


Chrome diopside ((Ca,Na,Mg,Fe,Cr)2(Si,Al)2O6) is a common constituent of peridotite xenoliths, and dispersed grains are found near kimberlite pipes, and as such are a prospecting indicator for diamonds. Occurrences are reported in Canada, South Africa, Russia and a wide variety of other locations. Peridotite xenolith from San Carlos, southwestern United States. ... Hewn kimberlite core sample from the James Bay Lowlands region of Northern Ontario, Canada. ... This article is about the gemstone. ...


Diopside was first described about 1800 and derives its name from the Greek dis - "two kinds" or "double" and opsis - "opinion" or "appearance" in reference to the two ways of orienting the vertical prism.


References


  Results from FactBites:
 
Chrome Diopside - english (157 words)
Chrome diopside is mostly available in small sizes: in the rare large sizes, the colour actually becomes so rich that it is too dark.
But for bright green accent stones, chrome diopside is ideal.
Chrome diopside is mostly mined in Yakutia and Siberia.
DIOPSIDE Chapter17. Inosilicates - chain silicates (539 words)
Diopside is the dominant clinopyroxene at both Franklin and Sterling Hill; in addition, it is found in moderate abundance in the marble quarries.
Diopside from the Franklin and Sterling Hill orebodies is white to light brown; it may be colorless in the Franklin Marble.
Diopside is common to many of the high-temperature assemblages of the calcium-silicate units at Franklin and Sterling Hill (Figures 12-19, 12-20, 12-24, 12-25, and 12-28).
  More results at FactBites »

 
 

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