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

This page in German - Diese Seite in Deutsch
© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.