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Janhaugite
Type Locality
Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway
Mineral Data
(Na,Ca)
3
(Mn
2+
,Fe
2+
)
3
(Ti,Zr,Nb)
2
(Si
2
O
7
)
2
O
2
(OH,F)
2
Strunz:
9.BE.17
Physical Properties
Hardness:
5.0
Tenacity:
very brittle
