General Information:
Chemical Formula:
Y4(Si,H4)4O12-x(OH)4+2x
IMA Status:
Approved IMA 1987
Name Origin:
Named after Thomas Barth.
Physical Properties:
Cleavage:
None
Color:
brownish black.
Density:
3.51
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Earthy (Dull)
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