Crystal chemistry and nomenclature of rhodonite-group minerals

Shchipalkina, Nadezhda V.; Pekov, Igor V.; Чуканов, Н. В.; Biagioni, Cristian; Pasero, Marco

doi:10.1180/mgm.2019.65

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…2+ have been reported and details on the ordering of M-site cations and the effects of composition on rhodonite structures are given by Peacor and Niizeki (1963), Peacor et al (1978a), Ohashi and Finger (1975), Nelson and Griffen (2005), Leverett et al (2008) and Shchipalkina et al (2017). The compositional range of the rhodonite-group minerals overlaps strongly with that of the bustamite-group minerals and in a minor way with that of pyroxmangite (Shchipalkina et al, 2019b).…”

Section: T 5 Chainsmentioning

confidence: 98%

“…The general formula for rhodonite-group minerals may be written as M 5 M 1–3 M 4 [ T 5 O 15 ], and a new nomenclature scheme was recently provided by Shchipalkina et al . (2019 b ). In these structures, 2 T 5 chains extend along [110] and link adjacent ribbons of higher-coordination polyhedra.…”

Section: Tr Classmentioning

confidence: 99%

“…(2017). The compositional range of the rhodonite-group minerals overlaps strongly with that of the bustamite-group minerals and in a minor way with that of pyroxmangite (Shchipalkina et al ., 2019 b ).

Fig.…”

Section: Tr Classmentioning

confidence: 99%

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A structure hierarchy for silicate minerals: chain, ribbon, and tube silicates

Day

Hawthorne

2020

MinMag

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A structure hierarchy is developed for chain-, ribbon- and tube-silicate based on the connectedness of one-dimensional polymerisations of (TO4)n− tetrahedra, where T = Si4+ plus P5+, V5+, As5+, Al3+, Fe3+, B3+, Be2+, Zn2+ and Mg2+. Such polymerisations are described by a geometrical repeat unit (with ng tetrahedra) and a topological repeat unit (or graph) (with nt vertices). The connectivity of the tetrahedra (vertices) in the geometrical (topological) repeat units is denoted by the expression cTr (cVr) where c is the connectivity (degree) of the tetrahedron (vertex) and r is the number of tetrahedra (vertices) of connectivity (degree) c in the repeat unit. Thus cTr = 1Tr12Tr23Tr34Tr4 (cVr = 1Vr12Vr23Vr34Vr4) represents all possible connectivities (degrees) of tetrahedra (vertices) in the geometrical (topological) repeat units of such one-dimensional polymerisations. We may generate all possible cTr (cVr) expressions for chains (graphs) with tetrahedron (vertex) connectivities (degrees) c = 1 to 4 where r = 1 to n by sequentially increasing the values of c and r, and by ranking them accordingly. The silicate (sensu lato) units of chain-, ribbon- and tube-silicate minerals are identified and associated with the relevant cTr (cVr) symbols. Following description and association with the relevant cTr (cVr) symbols of the silicate units in all chain-, ribbon- and tube-silicate minerals, the minerals are arranged into decreasing O:T ratio from 3.0 to 2.5, an arrangement that reflects their increasing structural connectivity. Considering only the silicate component, the compositional range of the chain-, ribbon- and tube-silicate minerals strongly overlaps that of the sheet-silicate minerals. Of the chain-, ribbon- and tube-silicates and sheet silicates with the same O:T ratio, some have the same cVr symbols (vertex connectivities) but the tetrahedra link to each other in different ways and are topologically different. The abundance of chain-, ribbon- and tube-silicate minerals decreases as O:T decreases from 3.0 to 2.5 whereas the abundance of sheet-silicate minerals increases from O:T = 3.0 to 2.5 and decreases again to O:T = 2.0. Some of the chain-, ribbon- and tube-silicate minerals have more than one distinct silicate unit: (1) vinogradovite, revdite, lintisite (punkaruaivite) and charoite have mixed chains, ribbons and/or tubes; (2) veblenite, yuksporite, miserite and okenite have clusters or sheets in addition to chains, ribbons and tubes. It is apparent that some chain-ribbon-tube topologies are favoured over others as of the ~450 inosilicate minerals, ~375 correspond to only four topologically unique graphs, the other ~75 minerals correspond to ~46 topologically unique graphs.

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Section: T 5 Chainsmentioning

confidence: 98%

Section: Tr Classmentioning

confidence: 99%

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A structure hierarchy for silicate minerals: chain, ribbon, and tube silicates

Day

Hawthorne

2020

MinMag

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“…The rods building the structure of pyroxenes can therefore be represented as R T O = R 2 2 . Fig.21shows the structure of rhodonite group minerals(Shchipalkina et al 2019), CaMn 4 Si 5 O 5 , seen along [100]*. This structure is composed by a regular alternation of wollastonite-like slabs and pyroxene-like slabs.…”

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confidence: 99%

Producing highly complicated materials. Nature does it better

et al. 2020

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Through the years, mineralogical studies have produced a tremendous amount of data on the atomic arrangement and mineral properties. Quite often, structural analysis has led to elucidate the role played by minor components, giving interesting insights into the physicochemical conditions of minerals and allowing the description of unpredictable structures that represented a body of knowledge critical for assessing their technological potentialities. Using such a rich database, containing many basic acquisitions, further steps became appropriate and possible, into the directions of more advanced knowledge frontiers. Some of these frontiers assume the name of modularity, complexity, aperiodicity, and matter organization at not conventional levels, and will be discussed in this review.

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“…There is a strong com-positional variation of Ca versus Mn contents (Fig. 7), ranging from Ca 0.48 Mn 4.56 (Si 5 O 15 ) to Ca 1.58 Mn 3.41 (Si 5 O 15 ), which covers practically the entire field of rhodonite as defined in the mineral classification of the rhodonite group (Shchipalkina et al 2019(Shchipalkina et al , 2020. One Ca-poor spot corresponds to recently defined member of the rhodonite group, vittinkiite, MnMn 4 (Si 5 O 15 ).…”

Section: Rhodonite Vittinkiitementioning

confidence: 99%

New type of epithermal manganese mineralization from the Banská Hodruša precious and base metal deposit at the Rozália mine, Hodruša- Hámre, Slovakia

Rybárik,

Števko,

Koděra

et al. 2023

J. Geosci.

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The newly discovered unusual epithermal manganese mineralization was found at the 18 th level of the Rozália mine in the Štiavnica stratovolcano and it is hosted by a NE-SW oriented fault dipping 55° to SE. Based on its structural setting and cross-cut relationship to a pre-caldera vein it belongs to a large system of post-caldera veins related to horst uplift in the central zone of the stratovolcano. The vein occurs in andesite and consists of two contrasting parts, including a part dominated by white coarse-grained calcite and Mn-rich part represented by abundant johannsenite, younger rhodonite and Mn-carbonates (rhodochrosite, Mn-calcite), in association with minor quartz, calcite, adularia, chlorite, and clinozoisite. Ore minerals are represented by sphalerite, galena, pyrite, chalcopyrite and rare inclusions of acanthite and can be found exclusively in the Mn-rich part of the vein. Johannsenite forms greenish-blue, greenish-brown or brown radial aggregates reaching up to 7 cm in size. Its average empirical formula is Ca 0.96 (Mn 0.97 Mg 0.07 Fe 0.03 ) 1.07 (Si 1.98 Al 0.02 ) 2.00 O 6 . Rhodonite shows a significant compositional variation of Ca and Mn contents, ranging from Ca 0.48 Mn 4.56 (Si 5 O 15 ) to Ca 1.58 Mn 3.41 (Si 5 O 15 ) as well as minor amounts of Fe (up to 0.32 apfu), Mg (up to 0.14 apfu) and Al (0.06 apfu). Microthermometry of fluid inclusions hosted by johannsenite, rhodonite, sphalerite, calcite and Mn-calcite determined that the mineralization precipitated from fluids of low salinity (1.4 to 5.3 wt. % NaCl eq.) and moderate homogenization temperatures (187-318 °C), with a trend of simultaneous decrease in salinity and temperature, interpreted as mixing of fluids. Boiling of fluids was recorded in early calcite at temperatures from 275 to 279 °C, corresponding to pressure from 58 to 62 bars and paleodepth from 704 to 752 m. These values are similar to data from other post-caldera veins in the vicinity of the mine, as well as from other johannsenite-bearing epithermal deposits in the world.

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Crystal chemistry and nomenclature of rhodonite-group minerals

Cited by 7 publications

References 22 publications

A structure hierarchy for silicate minerals: chain, ribbon, and tube silicates

A structure hierarchy for silicate minerals: chain, ribbon, and tube silicates

Producing highly complicated materials. Nature does it better

New type of epithermal manganese mineralization from the Banská Hodruša precious and base metal deposit at the Rozália mine, Hodruša- Hámre, Slovakia

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