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Sphene CaTiSiO

Silicates and titanosilicates. Britholite (Ca,REE)io(Si04)602, zircon ZrSi04, and sphene CaTiSiOs occur in nature. These minerals contain U and Th and are chemically durable under most geological conditions. For this reason, they are considered as potential actinide host phases. The britholite structure consists of two types (CN=9 and CN=7) of Ca-0 and REE-0 polyhedra linked by PO4 or Si04 tetrahedra. The ideal formula is (P6s/m, Z=l), A =... [Pg.480]

Titanium oxides. Titanium in soils is present in finely divided crystals of primary minerals such as rutile and anatase (Ti02), sphene (CaTiSiOs), and ilmenite (FeTi03). Titanium minerals are... [Pg.132]

As the ninth most common element in the earth s crust, titanium occurs at an abundance of 6,600 parts per milhon (ppm) or 5.63 grams per kilogram. Its chief sources are the minerals ilmenite (FeTiOj), rutile (Ti02), and sphene (CaTiSiOs) ilmenite is the source of approximately 90 percent of titanium produced. Titanitim is largely produced in the United States, Canada, Russia, Japan, Kazakhstan, Germany, France, and Spain. [Pg.1255]

Pure primary titanium dioxide does not occur naturally, but is derived by weathering from ilmenite (FeTiOs), perovskite (CaTiOs), and titanite (sphene) (CaTiSiO ). The weathering products form leuxocene ores with up to 68% mtile content. The... [Pg.235]

Muthuraman, M. and Patil, K.C. (1998) Synthesis, properties, sintering and microstructure of sphene, CaTiSiOs a comparative study of coprecipitation, sol-gel and combustion processes. [Pg.273]

Sphene, CaTiSiOs, itself is the most commonly encountered member of the sphene group. Calcium may be partially replaced by sodium, rare earths, etc., and titanium by niobium, iron, manganese, etc. In addition, OH and F may partially substitute for some oxygen. The symmetry is monoclinic. [Pg.7]

Titanite A calcium titanium silicate mineral with the formula CaTiSiOs Sometimes called sphene. [Pg.397]

Procedure of spray and freeze techniques for the preparation of Cr-doped sphene pigments from an aqueous solution of precursors salts followed by calcinations. Chromium doped CaSnSiOs pigments, developed pink hues. In Cr-doped CaTiSiOs have brown colorations due to the combination of Cr (111) and Cr (IV) cations dissolved in the sphene matrix. [38]... [Pg.547]

See other pages where Sphene CaTiSiO is mentioned: [Pg.94]    [Pg.7]    [Pg.94]    [Pg.132]    [Pg.476]    [Pg.142]    [Pg.779]    [Pg.771]    [Pg.6]    [Pg.255]    [Pg.1315]    [Pg.753]    [Pg.817]    [Pg.865]    [Pg.770]    [Pg.630]    [Pg.94]    [Pg.7]    [Pg.94]    [Pg.132]    [Pg.476]    [Pg.142]    [Pg.779]    [Pg.771]    [Pg.6]    [Pg.255]    [Pg.1315]    [Pg.753]    [Pg.817]    [Pg.865]    [Pg.770]    [Pg.630]    [Pg.54]    [Pg.481]    [Pg.286]    [Pg.1905]    [Pg.373]    [Pg.1163]    [Pg.1171]    [Pg.541]   


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