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Titanite, or sphene (from Ancient Greek σφηνώ (sphēnṓ) 'wedge'), [5] is a calcium titanium nesosilicate mineral, Ca Ti Si O 5. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium ; calcium may be partly replaced by thorium .
Sphene (synonym of titanite) Stantienite (a variety of amber) Sunstone (a variety of either oligoclase or orthoclase) T. Crystal of titanite with adularia and minor ...
Common titanium-containing minerals are anatase, brookite, ilmenite, perovskite, rutile, and titanite (sphene). [27] Akaogiite is an extremely rare mineral consisting of titanium dioxide. Of these minerals, only rutile and ilmenite have economic importance, yet even they are difficult to find in high concentrations.
Zircon and apatite can occur in both I- and S-type granites, whereas titanite (sphene) and allanite are considered diagnostic accessory minerals for I-type granites. [1] Allanite is typically surrounded by radial fractures, caused by the subsolidus increase in volume of allanite as a result of metamict alteration due to radioactive decay. While ...
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).
titanite A calcium titanium nesosilicate mineral, CaTiSiO 5. See also sphene. topography The arrangement of the natural and artificial physical features of an area. tor A large, free-standing residual mass (rock outcrop) that rises abruptly from the surrounding smooth and gentle slopes of a rounded hill summit or ridge crest. trace fossil trachyte
Actinolite. Nephrite (var.); Adamite; Aegirine; Afghanite; Agrellite; Algodonite; Alunite; Amblygonite; Analcime; Anatase; Andalusite. Chiastolite; Andesine ...
This list includes those recognised minerals beginning with the letters Y and Z.The International Mineralogical Association is the international group that recognises new minerals and new mineral names; however, minerals discovered before 1959 did not go through the official naming procedure, although some minerals published previously have been either confirmed or discredited since that date.