page_title: Andrianovite
hierarchical_section_title: Andrianovite
caption_attribution_description: English: White crystals of the extremely rare and relatively new mineral (IMA 2007-008) andrianovite from the type and only known locality worldwide: Koashva Mountain, Khibiny Massif, Kola, Russian Federation.
context_page_description: Andrianovite is a very rare mineral of the eudialyte group, with formula Na₁₂(K, Sr, Ce)₆Ca₆(Mn, Fe)₃Zr₃NbSi(Si₃O₉)₂(Si₉O₂₇)₂O(O, H₂O, OH)₅. The original formula was extended to show the presence of cyclic silicate groups and silicon at the M4 site, according to the nomenclature of eudialyte group. Andrianovite is unique among the eudialyte group in being potassium-rich. It is regarded as potassium analogue of kentbrooksite, but it also differs from it in being oxygen-dominant rather than fluorine-dominant. Also, the coordination number of Na in this representative is enlarged from 7 to 9. The name of the mineral honors Russian mathematician and crystallographer Valerii Ivanovich Andrianov.
context_section_description: Andrianovite is a very rare mineral of the eudialyte group, with formula Na₁₂(K,Sr,Ce)₆Ca₆(Mn,Fe)₃Zr₃NbSi(Si₃O₉)₂(Si₉O₂₇)₂O(O,H₂O,OH)₅. The original formula was extended to show the presence of cyclic silicate groups and silicon at the M4 site, according to the nomenclature of eudialyte group. Andrianovite is unique among the eudialyte group in being potassium-rich (other eudialyte-group species with essential K are davinciite and rastsvetaevite). It is regarded as potassium analogue of kentbrooksite, but it also differs from it in being oxygen-dominant rather than fluorine-dominant. Also, the coordination number of Na in this representative is enlarged from 7 to 9. The name of the mineral honors Russian mathematician and crystallographer Valerii Ivanovich Andrianov.
caption: Andrianovite found in Russia
exif: {}