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Lamprophyllite (named for its lustrous cleavage) is a rare, but widespread mineral Ti-silicate mineral usually found in intrusive agpasitic igneous rocks. Yellow, reddish brow, Vitreous, Pearly. Full isomorphic range between lampropyllite and baritollalpropyllite exist. Lamprophyllite is monoclinic, The mineral also has an orthorhombic polytype Unit-cell parameters mainly depend from the cationic composition in the interlayer position A[5] The crystal structures of the lamprophyllite-related minerals are based upon HOH modules consisting of a central octahedral O sheet sandwiched between two heteropolyhedral H sheets. Lamprophyllite melts incongruently (880 °C) with formation of titanium oxides: rutile, tausonite, freudenbergite. Syntetic lamprophyllite synthesis was crystallized from melt. Tewly formed lamprophyllite show higher Sr/Ba ratioi than in equilibrium melt
Dimensions | 15-25mm |
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