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Kentbrooksite
Type Locality
Kentbrooksite occurrence, Amdrup Firth, Kangerlussuaq Firth, Tunu Province (East Greenland), Greenland
Mineral Data
(Na,REE)
15
(Ca,REE)
6
(Mn
2+
,Fe
2+
)
3
Zr
3
Nb[Si
25
O
74
]F
2
·2H
2
O
Strunz:
9.CO.10
Physical Properties
Crystal System:
Trigonal
Streak:
White.
Hardness:
5.0 - 6.0
