Home Andalusite
VIII - Nesosilicates		 Crystal habit of Andalusite
 
Name   Andalusite
Chemistry   Al[6]Al[5][O|SiO4] = Al2SiO5
Hardness   7.5
Lustre   vitreous
Colour   grey, brown, dark green, red, often reddish brown
Streak   white 
Density [g/cm3]   3.1
Crystal habit   orthorhombic, crystals prismatic [110] with nearly square cross section
Cleavage, Fracture   [101] good, [010] poor, fracture conchoidal
other characteristics and occurrences   chiastolite = crystal with dark inclusions (often clay) in the form of a cross
typical metamorphic mineral, polymorph (same chemistry, different structure) with kyanite and sillimanite
   
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.