General Information:
Chemical Formula:
(Ce,La,Nd)2Al(SiO4)2(OH)
Composition:
(Molecular Weight = 509.02 gm)
Lanthanum 13.64 % La
Cerium 33.03 % Ce
Aluminum 5.30 % Al
Silicon 11.04 % Si
Hydrogen 0.20 % H
Neodymium 8.50 % Nd
Oxygen 28.29 % O
Empirical Formula:
Ce1.2La0.5Nd0.3Al(SiO4)2(OH)
Environment:
Rare-earth ore deposits.
IMA Status:
Approved IMA 1987
Locality:
Bastnaes mine near Riddarhyttan, Vastmanland, Sweden.
Name Origin:
Named for Alfred Ellis Tornebohm (1839-1911), former director of the Geological Survey of Sweden.
Physical Properties:
Color:
green or green.
Density:
4.9
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous - Adamantine
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