General Information:
Chemical Formula:
[ ]LiAl2Al6(Si6O18)(BO3)3(OH)4
Composition:
(Molecular Weight = 938.28 gm)
Lithium 0.74 % Li
Aluminum 5.75 % Al
Silicon 17.96 % Si
Boron 6.91 % B
Hydrogen 0.43 % H
Oxygen 68.21 % O
Empirical Formula:
LiAl2Si6O18(BO3)3(OH)4
Environment:
Granitic pegmatite hosted by biotite and hornblende gniess.
IMA Status:
Approved IMA (Dana # Added)
Locality:
Found in the Hradisko quarry, in the Rozn lepidolite subtype of granitic pegmatite, northeastern part of the Str zek Moldanubicum, Czech Republic.
Name Origin:
Named after George R. Rossman (1945-), California Institute of Technology, Pasadena, CA, USA, in recognition for his work on the spectroscopy of the tourmaline minerals.
Physical Properties:
Cleavage:
None
Color:
pink or pale pink.
Density:
3
Diaphaniety:
Transparent
Habits:
Columnar - Forms columns, Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
7 - Quartz
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
More details...