Enstatite


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enstatite

[′en·stə‚tīt]
(mineralogy)
MgOSiO2 A member of the pyroxene mineral group that crystallizes in the orthorhombic system; usually yellowish gray but becomes green when a little iron is present.

Enstatite

 

a mineral of the orthorhombic pyroxene group, last member of the isomorphic series enstatite, Mg2[Si2O6]–hypersthene, [Mg, Fe]2 [Si2O6]–ferrosilite, Fe2[Si2O6]. Enstatite contains not more than 5 percent FeO. It is colorless, greenish, or yellowish and has a hardness of 5.5 on Mohs’ scale and a density of 3,100–3,300 kg/m3. Enstatite is an important rock-forming mineral of magnesium-rich magmatic rocks. It alters to serpentine and talc upon the action of hydrothermal solutions.

References in periodicals archive ?
The phreatomagmatic breccia XRD patterns show the presence of clay minerals (smectites and serpentine minerals) in addition to enstatite, quartz and carbonates (calcite and dolomite) (Fig.
The enstatite (En 90-92) is euhedral to subhedral while the olivine (Fo 91-93) is subhedral to anhedral (Siddiqui et al., 1996).
Also in the KARP room were a dozen loose crystals of enstatite from Mogok which, for only about $100 tops, were remarkable bargains, considering that they are gemmy euhedral crystals of a rock-forming silicate species almost never seen as free-standing crystals at all.
Othmar Keel ("Cylinder and Stamp Seals in the Southern Levant between 1800 and 1500 BC") presents a corpus of fourteen fired steatite ("enstatite") cylinder seals, for the most part found in Palestine, whose iconography he plausibly sees as derived from Egyptian or Egyptianizing scarabs.
Chromitite is a rock which consists, essentially, of the mineral chromite and a pyroxene mineral which usually has the approximate composition of enstatite, a silicate of magnesium, ([MgO.SiO.sub.2]).
Additional peaks at 0.317, 0.288, 0.254 nm could be related to enstatite (Downs, 2006); others at ~1, 0.457, 0.261, 0.257 nm could be related to vermiculite (Downs, 2006), however in expanded material these peaks might also correspond with mica-like structure (probably muscovite) (Marcos et al., 2009; Marcos et al., 2010).
The harzburgite consist of enstatite 25-30 Percent , olivine 5 - 10 Percent , serpentine 55-60 Percent and spinel 3-5 Percent .The best preserved series of subophiolitic metamorphic rocks is located at the north-western side of the JTGM showing inverted metamorphic gradients.
The planet's surface seems to be rich in the silicate mineral enstatite, which is not obvious in NWA 7325.
Enstatite (En) end-member of these clinopyroxenes ranges from 43 to 48% while their ferrosillite (Fs) component is low, varying between 10 and 15% (Table 1).
Scientists had thought that most of the bodies that merged to make Earth formed from a narrow zone in space and were similar to each other, belonging to a subclass of meteorites called enstatite chondrites.
The new mineral, dubbed "Wassonite," was discovered inside the Yamato 691 enstatite chondrite meteorite by American researchers from NASA as well as scientists from Japan and South Korea.
It can be synthesized by several methods, however, avoiding the formation of MgSio3 and MgO during synthesis process is challenging.Besides, thermal treatments at 1200 up to 1600 AC and the presence of enstatite, which can be introduced adverse side-effects, are essential to achieve forsterite structures.