Mineral Information and Data:

Baotite
Ba4(Ti,Nb,W)8O16(SiO3)4Cl [CNMNC approved formula]

Named from the locality: Baiyun-Obo mine near Pat-t'ou (Baotou in Russian), Inner Mongolia.

IMA status : Approved Species 1959 ()
CLASSIFICATION 
Dana
(8th edition) :
60.01.02.01  
  (60) Cyclosilicate Four-Membered Rings
  (60.01) as Titanosilicates
  (60.01.02)
  
Nickel-Strunz
(10th edition) :
09.CE.15
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CE) [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
  
Crystal system: Tetragonal System
Point group (H-M): 4/m — dipyramidal
Unit cell: a = 20.02Å, c = 6.00Å
Crystal Habit: As crystals, to 10 cm; as subhedral crystals and grains.
  
Color: Light brown to black
Diaphaneity: Translucent to transparent
Luster: Semimetallic to vitreous.
Hardness (Mohs): 6
Measured Density: 4.42 - 4.71 g/cm3
Cleavage: Fair on {110}
Tenacity: Brittle
Fracture: Hackly
  
Geologic Setting: In quartz veins cutting quartzite near alkalic granite and syenite (Baiyun-Obo mine, China); in a carbonate vein cutting "hornblende" gneiss intruded by diabase sills and small pegmatites (Ravalli Co., Montana, USA).
Mineral Association: Quartz, calcite, aegirine, galena, pyrite, alkalic amphiboles (Baiyun-Obo mine, China); calcite, dolomite, ancylite, aeschynite, monazite, sodic amphiboles, barite (Ravalli Co., Montana, USA); benitoite, bario-orthojoaquinite, fresnoite, natrolite (Gem mine, California, USA)
  

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