This Blog 4u
Watermelon tourmaline
Specimens from
Brazil
and
Nigeria
. I was confused by seeing the chemical formula listed as:
AD
3
G
6
(BO
3
)
3
[T
6
O
18
]Y
3
Z
That is explained at
Wikipedia
(where it is listed as XY
3
Z
6
(T
6
O
18
)(BO
3
)
3
V
3
W).
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