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.
Pakistan is blessed with vast natural reserves of precious, semi-precious and coloured gemstones, including ruby, sapphire, emerald, tourmaline garnet, topaz, peridot, aquamarine, spinel, pargasite, diopsite, moonstone, serpentine, jade, epidote, pink beryl (morganite), goshnite, sphene, zoisite, turquoise, epitite, agite and almost all known varieties of quartz.
A variety of accessory minerals, including biotite, muscovite, sphene, zircon, garnet, and epidote, also occur in these rocks.
Sapphires, sphene, apatite, demantoid, corundum, quartz.
Mineral Rock sample Rock sample A (%) B (%) Quartz 25 28 Plagioclase 24 22 Alkali feldspar 39 36 Biotite 7 6 Muscovite 2 2 Hornblende 1 1 Limonite 1 2 Apatite, Zircon, Sphene 1 2 Total 100 99 TABLE 2 Vertebrate remains sampled in the cleft boulder on Ukasi Hill.
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.
U-Pb ages of zircon, monazite, and sphene from rocks of the Massabesic Gneiss complex and Berwick Formation, New Hampshire and Massachusetts.
The second type is red-orange in PPL and dark red in XP (x100), with clear to diffuse boundaries, fairly high optical density, slightly elongate, concordant with the micromass, aplastic inclusions of monocrystalline quartz, titanite (sphene) and opaques, r-sr.
Accessory minerals are andalusite, zircon, apatite, ilmenite, xenotime, monazite, rare sphene and garnet.