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Formula: KCa2(Si7Al)O17(OH)2.6H2O
Phyllosilicate (sheet silicate)
Crystal System: Orthorhombic
Specific gravity: 2.168 measured, 2.22 calculated
Hardness: 4
Colour: Greyish white
Common impurities: Ti,Fe,Mn,Mg,Sr,Na,Cl
Environments
Pegmatites
Hydrothermal environments
Localities
At the type locality, Apatitovyi Tsirk, Rasvumchorr Mine, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia,
hydrodelhayelite occurs as a secondary alteration product of
delhayelite from
ijolite-urtite
pegmatites in a differentiated alkalic massif. Associated
minerals include delhayelite,
lamprophyllite, eudialyte,
hisingerite, aegirine and
orthoclase
(HOM).
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