sphene การใช้

• Other minor inclusions are sphene, apatite, rutile, zircon, and sphalerite.
• Sphene is found in Half Dome Granodiorite.
• The minerals found are quartz, mica, chlorite, albite, sphene, and graphite.
• Distinctive accessory minerals include : fluorite, topaz, apatite, spinel, allanite, sphene and cassiterite.
• Less important are allanite, apatite, clinopyroxene, olivine, orthopyroxene, quartz, sphene and zircon.
• Of these the former consists of orthoclase, nepheline, sodalite, diopside and aegirine, biotite and sphene.
• These rocks contain also iron oxides ( usually titaniferous ), apatite, sometimes sphene, augite, and olivine.
• Minerals include biotite, clinopyroxene, plagioclase and quartz with accessory minerals such as apatite, magnetite, sphene and zircon.
• Common titanium-containing minerals are minerals anatase, brookite, ilmenite, perovskite, rutile, and titanite ( sphene ).
• Sphene, biotite and iron oxides are the other common constituents, but these rocks show much variety of composition and structure.
• While xenotime may contain significant amounts of thorium or uranium, the mineral does not undergo metamictization like sphene or zircon would.
• Minerals include alkaline feldspar, amphibole, biotite, plagioclase and quartz with accessory minerals such as apatite, iron-titanium oxides, sphene and zircon.
• These include peridot, aquamarine, topaz, ruby, emerald, rare-earth minerals bastnaesite and xenotime, sphene, tourmaline, and many varieties and types of quartz.
• A banded and mottled calc-silicate hornfels occurring with the limestone at Derry Falls, west-northwest of Braemar, has yielded malacolite, wollastonite, brown idocrase, garnet, sphene and hornblende.
• Greisens appear as highly vuggy with miarolitic cavities, disseminated halide minerals such as fluorite, and occasionally metallic oxide and sulfide ore minerals, borate minerals ( tourmaline ) and accessory phases such as sphene, beryl, topaz, etcetera.
• For instance, specimens of glaucophane-epidote schist, containing garnet, sphene and diallage collected by Eccles from several feet below the summit of Monte Viso were described in an 1889 paper " On Fulgurites from Monte Viso " by Dr Frank Rutley FGS.
• Minerals encountered in xenoliths include : andradite, anhydrite, anorthite, apatite, biotite, calcite, diopside, fassaite, garnet, gypsum, ilmenite, magnetite, monazite, orthopyroxene, perovskite, plagioclase, prehnite, quartz, sphene, thorite, wilkeite, wollastonite and zircon.
• Among accessory minerals, in addition to apatite, zircon, and iron oxides, the following may be mentioned : hornblende ( not common ), riebeckite ( rare ), epidote and zoisite, calcite, sphene, andalusite, sillimanite, kyanite, hercynite ( a green spinel ), rutile, orthite and tourmaline.
• A second great group of hornfels are the recrystallize as marbles, but where there has been originally an admixture of sand or clay lime-bearing silicates are formed, such as diopside, epidote, garnet, sphene, vesuvianite and scapolite; with these phlogopite, various feldspars, pyrites, quartz and actinolite often occur.
• Titanite or sphene is also seen in antique jewelry; it is typically some shade of chartreuse and has a luster, RI ( 1.885 2.050 ), and dispersion ( 0.051 ) high enough to be mistaken for diamond, yet it is anisotropic ( a high birefringence of 0.105 0.135 ) and soft ( hardness 5.5 ).