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Titanite, which is named for its titanium content, occurs as translucent to transparent, reddish brown, gray, yellow, green, or red monoclinic crystals. These crystals are typically sphenoid in habit and are often twinned. Possessing a subadamantine tending to slightly resinous luster, titanite has a hardness of 5.5 and a weak cleavage.
A pair of Titanites giganteus fossils at Wollaton Hall. Species of the genus Titanites can reach large sizes, with a diameter over 60 centimetres (2.0 ft) for Titanites giganteus and 90 centimetres (3.0 ft) for T. anguiformis. [2]
The biotite crystals are 1–3 mm across, being more or less euhedral; but they contain small inclusions of titanite and magnetite, indicating that biotite crystallization began after them. The distinguishing feature of the Kuna Crest granodiorite is the presence of anhedral crystals of hornblende abounding in inclusions of the other minerals.
Prospectors have worked the area of the mine since the late 19th-century, seeking mica, phosphate, and feldspar. [3]S. Orser and D. J. Wilson worked the mine in 1925. [4] In 1927, Bancroft Mining Company started excavations and found a cavity holding albite, fluorite, pyrite, sphene, and apatite crystals on the cavity floor.
Rare-earth ore, shown with a United States penny for size comparison. A rare-earth mineral contains one or more rare-earth elements as major metal constituents. Rare-earth minerals are usually found in association with alkaline to peralkaline igneous magmas in pegmatites or with carbonatite intrusives.
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Zircon, apatite, titanite, magnetite, ilmenite, and sulfides occur as accessory minerals. [12] Varieties deficient in hornblende and other dark minerals are called leucodiorite. [6] [13] A ferrodiorite is a dioritoid enriched in iron [14] and titanium. Ferrodiorites are common in the lower oceanic crust. [15]
Orthotitanates have the formula M 2 TiO 4, where M is divalent.An example of such a material is magnesium titanate (Mg 2 TiO 4), which adopts the spinel structure.Li 2 TiO 3 is not considered an orthotitanate since it adopts the rock-salt structure and does not feature an identifiable titanium anion.