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sphene

sphene (titanite) A nesosilicate CaTiSiO4 (O,OH,F); sp. gr. 3.45–3.55; hardness 5; crystals wedge-shaped, occasionally massive; brown, grey, reddish brown, yellow, or black; monoclinic; adamantine to resinous lustre; occurs as a primary accessory mineral in calc-alkaline igneous rocks and alkaline igneous rocks in which it may occur as a major constituent along with apatite, nepheline, and aegirine. It is common in contact metamorphosed limestones, particularly skarns.

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"sphene." A Dictionary of Earth Sciences. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sphene

titanite

titanite See SPHENE.

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"titanite." A Dictionary of Earth Sciences. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"titanite." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/titanite

"titanite." A Dictionary of Earth Sciences. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/titanite