Chemical Formula: (Fe++,Mg)2Al9(Si,Al)4O20(O,OH)4
Help on Composition: Composition: Molecular Weight = 811.89 g
 
Hydrogen 0.29 % H 2.55 % H2O 0.00 %
Lithium 0.09 % Li 0.18 % Li2O 0.00 %
Oxygen 47.30 % O 0.00 % 0.00 %
Magnesium 0.30 % Mg 0.50 % MgO 0.00 %
Aluminum 28.91 % Al 54.63 % Al2O3 0.00 %
Silicon 13.49 % Si 28.86 % SiO2 0.00 %
Iron 9.63 % Fe 12.39 % FeO 0.00 %


100.01 % 99.11 %
 
Help on Empirical Formula: Empirical Formula: Fe2+1.4Li0.1Mg0.1Al8.6Si3.9Al0.1O21.7(OH)2.3
Help on Environment: Environment: Metamorphosed aluminous sedimentary rocks
Help on Locality: Locality: Common world wide occurrences.. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, stauros - "cross" and lithos - "stone" in allusion to the common cross shaped twins of the crystals
Help on Synonym: Synonym: Staurotide