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sphene

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sphene [sfēn]
(mineralogy)
CaTiSiO5A 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.


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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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