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Chromium-dravite
About
Group Parent:
Tourmaline
Mineral Data
Na(Mg
3
)Cr
6
3+
(Si
6
O
18
)(BO
3
)
3
(OH)
3
(OH)
Strunz:
8/E.19-30
Physical Properties
Colour:
Dark emerald-green to greenish-black.
Crystal System:
Trigonal
Streak:
Greyish-green
Hardness:
7 - 7½
Synonyms
Synonyms:
Chromium Dravite
