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sphene (sf n)n. A titanium accessory mineral in some granite and metamorphic rocks, CaTiSiO5, occurring in usually small brown or yellow crystals and sometimes used as a gemstone. Also called titanite.
[French sphène, from Greek sphn, wedge.] |
sphene [sfiːn]n (Earth Sciences / Minerals) a brown, yellow, green, or grey lustrous mineral consisting of calcium titanium silicate in monoclinic crystalline form. It occurs in metamorphic and acid igneous rocks and is used as a gemstone. Formula: CaTiSiO 5 Also called titanite[from French sphène, from Greek sphēn a wedge, alluding to its crystals]
sphene (sfn) A brown or yellow monoclinic mineral occurring as an accessory mineral in igneous and metamorphic rocks. It usually occurs as wedge or lozenge-shaped crystals. Chemical formula: CaTiSiO5. |
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| 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. Petrographic reviews have shown that in drill holes DED-03, 04, 08 and 09, the magmatic-related assemblages comprise early garnet and clinopyroxene, followed by K-feldspar, biotite, magnetite, sphene and porphyry-related quartz with late stage actinolite-magnetite. In this study we compared the relationship between heavy mineral assemblages typical of the Baltic Shield (apatite, amphiboles, pyroxenes, zircon, garnet, epidote, tourmaline, staurolite, sphene, corundum, sillimanite, monazite, magnetite, and ilmenite) and the local bedrock (hematite, leucoxene, pyrite, micas, limonite, phosphates, carbonates, anatase, barite, and chlorite) (Jouzapavicius 1976; Viiding 1976). |
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