The roedderite-chayesite series from Spanish lamproites: crystal-chemical characterization

Alietti, Elisa; Brigatti, Maria Franca; Capedri, S.; Poppi, Luciano

doi:10.1180/minmag.1994.058.393.16

Cited by 7 publications

(2 citation statements)

References 11 publications

(14 reference statements)

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“…6). Chemical data make it possible to assume that the mineral is a Zn-and Cu-rich variety of roedderite, ideally KNaMg 5 [Si 12 O 30 ] (Alietti et al, 1994), or its hypothetic Mg−(Cu/Zn)-ordered analogue. Table 3.…”

Section: Cyclosilicate the Cuzn-rich Analogue Of Roedderitementioning

confidence: 99%

Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia &#8211; Part 1: Neso-, cyclo-, ino- and phyllosilicates

et al. 2020

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Abstract. This is the initial paper in a pair of articles devoted to silicate minerals from fumaroles of the Tolbachik volcano (Kamchatka, Russia). These papers contain the first systematic data on silicate mineralization of fumarolic genesis. In this article nesosilicates (forsterite, andradite and titanite), cyclosilicate (a Cu,Zn-rich analogue of roedderite), inosilicates (enstatite, clinoenstatite, diopside, aegirine, aegirine-augite, esseneite, “Cu,Mg-pyroxene”, wollastonite, potassic-fluoro-magnesio-arfvedsonite, potassic-fluoro-richterite and litidionite) and phyllosilicates (fluorophlogopite, yanzhuminite, “fluoreastonite” and the Sn analogue of dalyite) are characterized with a focus on chemistry, crystal-chemical features and occurrence. Unusual As5+-rich varieties of forsterite, andradite, titanite, pyroxenes, amphiboles and mica are described. General data on silicate-bearing active fumaroles and the diversity and distribution of silicates in fumarole deposits are reported. Evidence for the fumarolic origin of silicate mineralization is discussed.

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Section: Cyclosilicate the Cuzn-rich Analogue Of Roedderitementioning

confidence: 99%

Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia &#8211; Part 1: Neso-, cyclo-, ino- and phyllosilicates

et al. 2020

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“…Enstatite in association with richterite, richterite fragment with Na‐Al augite inclusion, and the coexistence of richterite and roedderite in the melt matrix breccia SP7#2012‐3 indicate co‐ or sequential crystallization of these phases from the common melt, probably on the late stage of its evolution. In terrestrial rocks, richterite was observed in an aggregate with roedderite and crystallized at temperature ~1000 °C in lamproites (Alietti et al 1994). It is notable that synthetic fluororichterite glass ceramic crystallizes fluororichterite and roedderite at temperatures 900 and 960 °C (Denry and Holloway 2006).…”

Section: Discussionmentioning

confidence: 99%

Aubrite Pesyanoe: Clues to composition and evolution of the enstatite achondrite parent body

Lorenz

Ivanova

Brandstäetter

et al. 2020

Meteorit & Planetary Scien

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The Pesyanoe aubrite is an essentially polymict regolith breccia comprised by fragments of different highly magnesian pyroxenitic lithologies: albite; anorthoclase and labradorite-bearing pyroxenites; diopside and magnesian augite pyroxenites; roedderite-and forsterite-bearing pyroxenites; and impact glasses; porphyritic and melt matrix breccia fragments; FeO-rich chondritic inclusions; and exotic oxidized clasts. The parent magma of Pesyanoe probably was carbon saturated, as suggested by pyroxenite fragments containing igneous-textured carbon phases, possibly graphite. The composition of feldspar and trapped melt inclusions in enstatite indicates occurrence of at least three metaluminous melt sources with different (K + Na)/Al and K/(K + Na) atomic ratios on the Pesyanoe parent body and has records of K and Na loss from the melt, possibly due to evaporation from the parent body surface. The roedderite-and forsterite-bearing rocks probably crystallized from a peralkaline melt. We propose that peralkaline melt could be formed from a metaluminous melt(-s) due to gravitational segregation of djerfisherite-bearing metal-sulfide liquid in the lower horizon of the magma chamber and following oxidation of the magma. This should lead to enrichment of silicate melt in K 2 O and Na 2 O and increasing of (K + Na)/Al > 1, allowing forsterite and roedderite to crystallize. Rocks enriched in K and containing rare Kbearing minerals were found among both magmatic and melt rocks. This may imply an insignificant role of regolith transport in the process of the breccia's formation and, therefore, an origin of all of the breccia components from a local region of the Pesyanoe parent body, probably from a single complex igneous massif.

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Trattnerite, (Fe,Mg)2(Mg,Fe)3Si12O30, a new mineral of the milarite group: mineral data and crystal structure

Postl¹,

Walter²,

Ettinger³

et al. 2004

ejm

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The roedderite-chayesite series from Spanish lamproites: crystal-chemical characterization

Cited by 7 publications

References 11 publications

Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia &#8211; Part 1: Neso-, cyclo-, ino- and phyllosilicates

Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia &#8211; Part 1: Neso-, cyclo-, ino- and phyllosilicates

Aubrite Pesyanoe: Clues to composition and evolution of the enstatite achondrite parent body

Trattnerite, (Fe,Mg)2(Mg,Fe)3Si12O30, a new mineral of the milarite group: mineral data and crystal structure

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The roedderite-chayesite series from Spanish lamproites: crystal-chemical characterization

Cited by 7 publications

References 11 publications

Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia &amp;#8211; Part 1: Neso-, cyclo-, ino- and phyllosilicates

Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia &amp;#8211; Part 1: Neso-, cyclo-, ino- and phyllosilicates

Aubrite Pesyanoe: Clues to composition and evolution of the enstatite achondrite parent body

Trattnerite, (Fe,Mg)2(Mg,Fe)3Si12O30, a new mineral of the milarite group: mineral data and crystal structure

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Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia – Part 1: Neso-, cyclo-, ino- and phyllosilicates

Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia – Part 1: Neso-, cyclo-, ino- and phyllosilicates