sphene


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sphene

[sfēn]
(mineralogy)
CaTiSiO5 A brown, green, yellow, gray, or black neosilicate mineral common as an accessory mineral in igneous rocks; it is monoclinic and has resinous luster; hardness is 5-5.5 on Mohs scale; specific gravity is 3.4-3.5. Also known as grothite; titanite.
References in periodicals archive ?
First samples were taken, then thin layers were made of the samples that led to the discovery of accessory minerals like zircon, sphene and apatite.
It is composed of feldspar, usually potash feldspar and oligoclase and quartz, with a small amount of mica and minor accessory minerals, such as zircon, apatite, magnetite, ilmenite and sphene.
The regular octahedrons rest on colorless and smoky quartz and are accompanied by other minerals including prehnite, sphene and adularia.
Abdel-Rahman 2006), [+ or -] apatite and sphene occur as accessory minerals.
Some dykes show lenses made of diopside, plagioclase (An 86), and sphene, possibly resulted from calcic metasomatism processes within the amphibolite facies.
U-Pb ages of zircon, monazite, and sphene from rocks of the Massabesic Gneiss complex and Berwick Formation, New Hampshire and Massachusetts.
Accessory minerals are andalusite, zircon, apatite, ilmenite, xenotime, monazite, rare sphene and garnet.
Zircon distribution is typical of acid hydrolysis; the layer diversity of the profile with respect to tourmaline, kyanite, staurolite, rutile, and sphene appears to be related not only to the weathering, but also to the initial heterogeneity of wind affected sediment.
For instance, trace amounts of limonite impart a yellowish brown color; serpentine, hornblende, and diopside produce varying tones of green; minute quantities of hematite, vesuvianite, and garnet introduce a reddish brown hue; sphene, epidote, and chondrodite give a yellow tinge; and plant and animal remains produce shades of dark gray to almost black.
62% of the Earth's crust and occurs primarily in the minerals anatase, brookite, ilmenite, leucoxene, peovskite, futile, and sphene.
Mafic minerals have been replaced with diopside, sphene and hedenbergite in the endoskarn.