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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 brooklite.

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

A crystal of one species inclosed within one of another, as one of rutile inclosed in quartz.

A ferruginous variety of rutile.

Acicular rutile occurring in reticulated forms imbedded in quartz.

; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like.

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.

ntally distinct, as is the case with titanium dioxide, which crystallizes in the forms of rutile, octahedrite, and brookite. See Pleomorphism.

em and branches. -- Venus's hair stone (Min.), quartz penetrated by acicular crystals of rutile. -- Venus's looking-glass (Bot.), an annual plant of the genus Specularia allied to the bellflower; -- also called lady's looking- glass. -- Venus's navelwort (Bot.), any one of several species of Omphalodes, low boragina…