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Middendorfite
Type Locality
Hilairitovoye pegmatite, Kirovskii apatite mine (Kirovsky Mine; Kirovskii Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Mineral Data
K
3
Na
2
Mn
5
Si
12
(O,OH)
36
·2H
2
O
Strunz:
9.EJ.10
Physical Properties
Hardness:
3.0 - 3.5
