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TiO2 Polymorphs

Titanium dioxide occurs in nature in three different polymorphs: rutile, brookite and anatase. Rutile is tetragonal and often exhibits fascinating twinning, including cyclic sixlings and eightlings. Anatase is also tetragonal, forming bipyramidal crystals. Brookite is orthorhombic and occurs in bladed crystals.
Brookite, 16 mm sharply terminated crystal group, Kharan, Baluchistan, Pakistan. Brookite floater crystal, 10 mm, Mose Hill, Magnet Cove, Arkansas, USA. Anatase. Sharp bipyramidal crystals to 12 mm on 45 mm drusy quartz matrix. Dyrafonn, Hardangervidda, Norway. Anatase. Sharp gemmy 7 mm bipyramidal crystal on matrix. Mount Kharan, Balbundi, Baluchistan, Pakistan. Rutile geniculate twin, 2 cm. Mount Kharan, Balbundi, Baluchistan, Pakistan.
Rutile geniculate twin, 8 mm, Khomas, Namibia. Rutile V-twin, 28 mm, Adams Farm, Hiddenite, North Carolina, USA. Ex Ernest Schlichter collection No. E2232. Mirror-bright 2 cm twinned rutile crystal on 43 mm matrix. Graves Mountain, Georgia, USA. Rutile crystals to 18 mm on 3 cm matrix. Graves Mountain, Georgia, USA. 19th Century specimen. Rutile, lustrous crystals to 15 mm on quartz, 60 x 40 mm specimen. Mt. Kapudzhuk, Azerbaijan.
Rutile doubly terminated crystal, 7 mm. Kyauk Pyat That, west of Mogok, Burma. Rutile eightling cyclic twin, 2 cm across. Parkesburg, Sadsbury Township, Chester Co., Pennsylvania, USA. Ex. Larry Krause Rutile eightling cyclic twin, 2 cm across. Parkesburg, Sadsbury Township, Chester Co., Pennsylvania, USA. Ex. Larry Krause Rutile cyclic eightling twin, 1 cm, Magnet Cove, Arkansas, USA. Rutile cyclic eightling twin, 13 mm, Magnet Cove, Arkansas, USA.
Rutile cyclic eightling twin, 13 mm, Magnet Cove, Arkansas, USA. Rutile, 2 cm cyclically twinned sixling. Tetikanana, central Madagascar. Trilling of rutile var struverite, 17 mm, Madagascar. Cyclically twinned rutile sixling, 15 mm. Kipushi, DR Congo. Cyclically twinned rutile sixling, 15 mm. Kipushi, DR Congo.
Cyclically twinned rutile sixling, 15 mm. Kipushi, DR Congo. Rutile with siderite and apatite, 6 cm speimen. Hachupa, Baltistan, Pakistan. Rutile with siderite and apatite, 6 cm speimen. Hachupa, Baltistan, Pakistan. Rutile with siderite and apatite, 6 cm speimen. Hachupa, Baltistan, Pakistan. Rutile, 4 cm specimen, Magnet Cove, Arkansas, USA.