The name has now been formally abandoned and enstatite or ferrosilite is preferred.
It forms a solid solution series with the minerals enstatite and ferrosilite, being a mid-way member between the two, and for both of which it is often regarded as a synonym.
Distinctly developed crystals are rare, the mineral being usually found as foliated masses embedded in the igneous rocks norite and hypersthene-andesite, of which it forms an essential constituent.
en.wikipedia.org /wiki/Hypersthene (303 words)
Pyroxene [Definition](Site not responding. Last check: 2007-10-14)
The enstatite - ferrosilite The pyroxene silicate minerals enstatite (MgSiO3) and ferrosilite (FeSiO3) form a complete solid solution series and are common rock-forming minerals found in igneous and metamorphic rocks and meteorites.
The intermediate composition, (Mg,Fe)SiO3, is sometimes known as hypersthene although this name has been formally abandoned and replaced by enstatite or ferrosilite.
HyperstheneHypersthene is a common rock-forming mineral belonging to the group of orthorhombicpyroxenes.
Ferrosilite mineral data, information about Ferrosilite, its properties and worldwide locations.
Comments: Transparent, brown prismatic blades of ferrosilitecrystals on matrix.
Ferrosilite is not stable at low pressure, and breaks down to a...
www.surch.co.uk /ferrosilite (169 words)
Pyroxene Solid Solution(Site not responding. Last check: 2007-10-14)
100% magnesium would yield a composition called "enstatite", and a composition of 0% magnesium (100% iron) would be called "ferrosilite".
In the clinopyroxenes, calcium is always present in varying abundances, and is in addition to the variability possible in the Mg/Fe ratio, although the total amount of Ca cannot be more than 50%; the sum of Mg+Fe cannot be 100% anymore because Ca is included too (i.e., Mg+Fe+Ca = 100% of the cations).
A point on the line between Mg and Fe has a composition that includes Mg and Fe and has 0% Ca; if the point is closer to Mg, then there is more Mg than Fe.
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Orthopyroxenes show a continuous range in (Fe,Mg) substition between pure enstatite (Mg2Si2O6) and pure ferrosilite (Fe2Si2O6), with the classification break at Fs=Fe/(Fe+Mg)=0.5.
Magnesian-rich enstatites (Fs6-11) are commonly associated with olivine, diopside and spinel in ultramafic rocks.
Charnockite is a granite-like rock that contains orthopyroxene instead of the usual hydrous mafic minerals such as biotite and hornblende.
The Fe-free and Mg-free end members are enstatite (x=1) and ferrosilite (x=0), respectively.
Orthopyroxenes with an FeO content between 5 and 15 mass % have the mineral name bronzite, orthopyroxenes with larger FeO content are called hypersthene.
Enstatite Information and Resources from Very Famous Gems(Site not responding. Last check: 2007-10-14)
Enstatite - Ferrosilite General Category Mineral Chemical formula (Mg,Fe)SiO3 Identification Colour Mg end member: colourless, grey, green, yellow or brown.
The pyroxene silicate minerals enstatite (MgSiO3) and ferrosilite (FeSiO3) form a complete solid solution series and are common rock-forming minerals found in igneous and metamorphic rocks and meteorites.
Weathered enstatite with a small ammount of iron takes on a submetallic luster and a bronze-like color.
Pyroxene -- Facts, Info, and Encyclopedia article(Site not responding. Last check: 2007-10-14)
The names of the common calcium - iron - magnesium pyroxenes are defined in the 'pyroxene quadrilateral' shown in figure 1.
The (Click link for more info and facts about enstatite - ferrosilite) enstatite - ferrosilite series ([Mg,Fe]SiO
) contain up to 5 mol.% calcium and exists in three polymorphs, (Click link for more info and facts about orthorhombic) orthorhombic orthoenstatite and protoenstatite and (Click link for more info and facts about monoclinic) monoclinic clinoenstatite (and the ferrosilite equivalents).
Pyroxenoid Structures(Site not responding. Last check: 2007-10-14)
The repeat integer n, increases as the mean size of the divalent cation decreases.
For wollastonite and bustamite, n = 3, for rhodonite, n = 5, for pyroxmangite and pyroxferroite, n = 7, and for ferrosilite III, n = 9.
In addition to the above anhydrous proxenoids, there is also a series of hydrous pyroxenoids in which Na + H substitute for one of the divalnet cations giving us pectolite (NaHCa
Ingrid's Rockin' Dictionary(Site not responding. Last check: 2007-10-14)
; one corner of pyroxene quadrilateral [see also enstatite; ferrosilite; hedenbergite]; midway between enstatite and wollastonite
; the magnesium endmember of the pyroxene system [see also wollastonite, ferrosilite, diopside, hedenbergite]; orthorhombic; also, a class of (chondritic?) meteorite.
A type of achondrite meteorite made primarily from basaltic plagioclase and (Ca-)pyroxene; three types: noncumulate, cumulate, and polymict; grouped with howardites and diogenites in HED meteorite classification; [see Meteorites f for HEDs]
Peculiarity and defect structure of the natural and synthetic zeolite mordenite: A single-crystal X-ray study
Members - Full Text download (980 K) Model independent phase equilibrium constraints on the ferrosilite activity in the binary Fe-Mg orthopyroxene solid solution
Members - Full Text download (708 K) Microstructural study of synthetic sintered diamond and comparison with carbonado, a natural polycrystalline diamond
