Barytolamprophyllite

barytolamprophyllite

aegirine

nepheline

cancrinite

Images

Formula: (BaK)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂
Sorosilicate (Si₂O₇ groups), lamprophyllite group
Crystal System: Monoclinic
Specific gravity: 3.62 to 3.66 measured, 3.61 calculated
Hardness: 2 to 3
Streak: Yellow-white
Colour: Dark brown
Common impurities: Al,Mn,Mg,F,Cl,P
Environments

Plutonic igneous environments
Pegmatites

Localities

At the Gardiner Complex, Kangerlussuaq Fjord, Sermersooq, Greenland, barytolamprophyllite is associated with amphibole, eudialyte, natrolite and pectolite (HOM).

At the type locality, Kukisvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia, barytolamprophyllite occurs in ijolite containing lamprophyllite, associated with aegirine, nepheline, K-feldspar, cancrinite and apatite. The barytolamprophyllite occurs as a foliated aggregate with single crystal grains up to 5 mm (Scienta Sinica 14.1546-1553, Mindat).

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