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Sagenite :: Sagenite (n.) Acicular rutile occurring in reticulated forms imbedded in quartz.

Titanium :: Titanium (n.) An elementary substance found combined in the minerals manaccanite, rutile, sphene, etc., and isolated as an infusible iron-gray amorphous powder, having a metallic luster. It burns when heated in the air. Symbol Ti. Atomic weight 48.1..

Rutile :: Rutile (n.) A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals. In composition it is titanium dioxide, like octahedrite and brookite..

Trimorphism :: Trimorphism (n.) The property of crystallizing in three forms fundamentally distinct, as is the case with titanium dioxide, which crystallizes in the forms of rutile, octahedrite, and brookite. See Pleomorphism..

Nigrine :: Nigrine (n.) A ferruginous variety of rutile.

Brookite :: Brookite (n.) A mineral consisting of titanic oxide, and hence identical with rutile and octahedrite in composition, but crystallizing in the orthorhombic system..

Endomorph :: Endomorph (n.) A crystal of one species inclosed within one of another, as one of rutile inclosed in quartz..

Sagenitic :: Sagenitic (a.) Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like..

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