page_title: Lamprophyllite
hierarchical_section_title: Lamprophyllite
caption_attribution_description: English: Lamprophyllite-Nepheline pseudobinare phase diagram
context_page_description: Lamprophyllite is a rare, but widespread mineral Ti-silicate mineral usually found in intrusive agpasitic igneous rocks. Yellow, reddish brown, Vitreous, Pearly.
  Lamprophyllite formula is (Sr, Ba, K, Na)₂Na(Na, Fe, Mn)₂Ti[Ti₂O₂(Si₂O₇)₂[(O, OH, F)₂. Full isomorphic range between lampropyllite and baritollalpropyllite exist.
  The general crystal-chemical formula for lampropyllite-related minerals can be written as A2[(M2)2X2] [[5] L2(Si2O7)2O2], where the contents of the O and H sheets are given in square brackets in this order and A = Sr, Ba, K, Na; M1 = Na, Mn2+; M2 = Na, Mn2+, Fe2+, Ca; M3 = Ti, Mn2+, Mg, Fe3+, Fe2+; L = Ti, Fe3+; X = OH, O, F.
  Lamprophyllite is monoclinic, The mineral also has an orthorhombic polytype Unit-cell parameters mainly depend from the cationic composition in the interlayer position A 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 with formation of titanium oxides: rutile, tausonite, freudenbergite. Syntetic lamprophyllite synthesis was crystallized from melt.
context_section_description: Lamprophyllite (named for its lustrous cleavage) is a rare, but widespread mineral Ti-silicate mineral usually found in intrusive agpasitic igneous rocks. Yellow, reddish brown, Vitreous, Pearly.
  Lamprophyllite formula is (Sr,Ba,K,Na)₂Na(Na,Fe,Mn)₂Ti[Ti₂O₂(Si₂O₇)₂[(O, OH,F)₂ . Full isomorphic range between lampropyllite and baritollalpropyllite exist.
  The general crystal-chemical formula for lampropyllite-related minerals can be written as A2[(M1)(M2)2(M3)X2] [[5] L2(Si2O7)2O2], where the contents of the O and H sheets are given in square brackets in this order and A =  Sr, Ba,K, Na; M1 = Na, Mn2+; M2 = Na, Mn2+, Fe2+, Ca; M3 = Ti, Mn2+, Mg, Fe3+, Fe2+; L = Ti, Fe3+; X = OH, O, F.
  Lamprophyllite is monoclinic, The mineral also has an orthorhombic polytype Unit-cell parameters mainly depend from the cationic composition in the interlayer position A 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.
caption: Pseudobinare phase diagram lamprophyllite-nepheline
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