page_title: Georgbarsanovite
hierarchical_section_title: Georgbarsanovite
caption_attribution_description: English: Locality: Petrelius River, Khibiny, Kola, Russian Federation Size: 0.14 × 0.08 × 0.05 cm Description: A small translucent crystalline fragment from the type locality (TL) of this extremely rare species. This fragment is part of the holotype. Georgbarsanovite is a very rare mineral of the eudialyte group, formerly known under unaccepted name as barsanovite. Barsanovite, described in 1963 as а monoclinic dimorph of trigonal eudialyte, was discredited in 1969 bесаuse its assignment to the monoclinic system had been proved to bе erroneous. Revision study of the barsanovite type specimen carried out with use of the X-ray single crystal analysis has shown that the mineral is trigonal and has а distinct combination of cations and anions in the key sites of the crystal structure. The mineral was revalidated in 2003 as georgbarsanovite given as before after prof. Georgiy Pavlovich Barsanov (1907-1991). [rruff] IMA2003-013 - Discredited monoclinic Barsanovite to trigonal. IMA2007-008 - Determined trigonal structure of georgbarsanovite. Type Locality: Nepheline pegmatite outcrop, Petrelius River, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.
context_page_description: Georgbarsanovite is a very rare mineral of the eudialyte group, formerly known under unaccepted name as barsanovite, with formula Na₁₂(Mn, Sr, REE)₃Ca₆Fe₃²⁺Zr₃NbSi(Si₃O₉)₂(Si₉O₂₇)₂O₄Cl₂•H₂O. The original formula was extended to show the presence of cyclic silicate groups and domination of silicon at the M4 site. "REE", standing for rare earth elements, are dominated by cerium. Georgbarsanovite characterizes in dominance of manganese at the N4 site. It also differs from most other accepted group representatives in its colour. The mineral was found in nepheline pegmatite nearby Petrelius river, Khibiny massif, Kola Peninsula, Russia. It is named after Russian mineralogist Georg Barsanov.
context_section_description: Georgbarsanovite is a very rare mineral of the eudialyte group, formerly known under unaccepted name as barsanovite, with formula Na₁₂(Mn,Sr,REE)₃Ca₆Fe₃²⁺Zr₃NbSi(Si₃O₉)₂(Si₉O₂₇)₂O₄Cl₂•H₂O. The original formula was extended to show the presence of cyclic silicate groups and domination of silicon at the M4 site. "REE", standing for rare earth elements, are dominated by cerium. Georgbarsanovite characterizes in dominance of manganese at the N4 site. It also differs from most other accepted group representatives in its colour. The mineral was found in nepheline pegmatite nearby Petrelius river, Khibiny massif, Kola Peninsula, Russia. It is named after Russian mineralogist Georg Barsanov.
caption: Georgbarsanovite
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