Home Tridymite
IV - Oxides		 Crystal habit of Tridymite Tridymite
 
Name   Tridymite
Chemistry   SiO2
Hardness   6.5 - 7
Lustre   vitreous
Colour   colourless, white, yellowish white or grey
Streak   white 
Density [g/cm3]   2.0
Crystal habit   monoclinic-pseudohexagonal, crystals plately with hexagonal cross-section, twins or six-rayed trillings = "triplets"
Cleavage, Fracture   fracture conchoidal
other characteristics and occurrences   geological thermometer, because formed between 870 - 1470°C, in volcanic rocks
   
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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