Rutile

Japanese: ルチル
Rutile

Also called rutile. Naturally occurring TiO2 , found in small amounts in metamorphic and igneous rocks. Tetragonal crystals in space group P4 / mnm . Contains two basic compositions in the unit cell. Polymorphs include brookite (orthorhombic) and anatase (tetragonal). Clear {110} cleavage. Hardness 6-6.5. Density 4.23 g cm -3 . [See alternative terms] Titanium dioxide.

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

Japanese:

金紅石ともいう.天然産のTiO2で,変成岩,火成岩中に少量産出する.空間群 P 4/mnmに属する正方晶系の結晶.単位格子中に二つの基本組成を含む.多形として,板チタン石(brookite)(斜方),鋭すい石(anatase)(正方)がある.へき開{110}明瞭.硬度6~6.5.密度4.23 g cm-3.[別用語参照]二酸化チタン

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