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pyroxenoids

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Journal Article
Published: 01 May 2018
European Journal of Mineralogy (2018) 30 (3): 451–463.
...Mariko Nagashima; Teruyoshi Imaoka; Chihiro Fukuda; Thomas Pettke Relationships between cation substitution and hydrogen-bond system in hydrous pyroxenoids with a twisted chain consisting of three SiO 4 tetrahedra are investigated by means of chemical and X-ray single-crystal structural analysis...
FIGURES | View All (8)
Journal Article
Published: 21 February 2018
Mineralogical Magazine (2021) 85 (3): 444–453.
...Marcus J. Origlieri; Robert T. Downs; Derek R. Hoffman; Mihai N. Ducea; Jeffrey E. Post Abstract Marshallsussmanite (IMA2013-067) is a new pyroxenoid mineral from the Wessels mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Marshallsussmanite has ideal formula NaCaMnSi 3 O 8...
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Journal Article
Published: 01 November 2016
American Mineralogist (2016) 101 (11): 2544–2553.
...Richard M. Thompson; Hexiong Yang; Robert T. Downs Abstract A hypothetical ideal wollastonite with regular octahedra and T3 tetrahedron is presented and used to compare and contrast the pyroxenes and pyroxenoids. While clinopyroxenes have close-packed arrangements of oxygen anions, several lines...
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Journal Article
Published: 01 June 2010
European Journal of Mineralogy (2010) 22 (3): 393–402.
... is partially occupied. Five crystallographically independent octahedral sites are occupied by Mn (mainly Mn 2+ with 10–20 % Mn 3+ ), with additional small amounts of Ca and V 3+ . An undulating pyroxenoid-like chain is built by five SiO 4 tetrahedra. A sixth tetrahedron, forming a branch of the chain...
FIGURES
Journal Article
Published: 01 March 2003
European Journal of Mineralogy (2003) 15 (2): 381–391.
...Gian Carlo CAPITANI; Henry Bernard GROBÉTY; Marcello MELLINI Abstract The late crystallisation stages of Campiglia Marittima skarn are characterised by an increase in Mn-activity at the meta-somatic front. Mn-pyroxenoids became stable with respect to johannsenite. The pyroxene-pyroxenoid textures...
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Journal Article
Published: 01 August 1996
American Mineralogist (1996) 81 (7-8): 822–832.
...D. Andrault; J. P. Itie; F. Farges Abstract The CaGeO 3 and SrGeO 3 perovskites and CaGeO 3 , SrGeO 3 , and MnGe0 3 pyroxenoids have been studied at high-temperature by X-ray diffraction (XRD) and X-ray absorption fine-structure spectroscopy (XAFS). The diffraction studies show that the back...
Journal Article
Published: 01 April 1981
American Mineralogist (1981) 66 (3-4): 278–289.
Journal Article
Published: 01 June 1971
American Mineralogist (1971) 56 (5-6): 877–887.
Journal Article
Published: 01 December 1964
American Mineralogist (1964) 49 (11-12): 1527–1542.
...C. T. Prewitt; Donald R. Peacor Abstract The classification of the crystal structures of the pyroxenes and pyroxenoids according to the repeat unit of the silicate chain is well-known. This system does not, however, differentiate between structures which contain similar types of chains. For example...
Journal Article
Published: 01 June 1991
American Mineralogist (1991) 76 (5-6): 900–903.
...Ross J. Angel; Charles W. Burnham Abstract Previous discussions of the pyroxenoid and clinopyroxene crystal structures have noted the polysomatic relationship between them, in which pyroxenoids with chain periodicities greater than three contain both pyroxeno-like (P) and wollastonite-like (W...
Journal Article
Published: 01 October 1985
American Mineralogist (1985) 70 (9-10): 885–901.
...David R. Veblen Abstract A specimen of the CaMn clinopyroxene johannsenite that has partially reacted to Mn pyroxenoids has been studied with high-resolution transmission electron microscopy (HRTEM), electron diffraction, and single-crystal X-ray methods. The primary johannsenite is structurally...
Journal Article
Published: 01 October 1980
American Mineralogist (1980) 65 (9-10): 981–985.
...Friedrich Liebau Abstract In pyroxenoids containing cationic hydrogen [pectolite, schizolite, serandite, unnamed Ca(Sc,Fe 3+ )H[Si 3 O 9 ], synthetic Cd 2 NaH[Si 3 O 9 ], nambulite, Li-hydrorhodonite, santaclaraite, and babingtonite] the identity periods of the silicate chains are approximately...
Journal Article
Published: 01 April 1992
American Mineralogist (1992) 77 (3-4): 380–390.
...Kenneth J. T. Livi; David R. Veblen Abstract Two occurrences of johannsenite partially altered to pyroxenoid minerals were studied by X-ray emission analytical electron microscopy in the context of the pyroxene-wollas-tonite polysomatic series in order to determine the relationships between...
Journal Article
Published: 01 April 1990
American Mineralogist (1990) 75 (3-4): 409–414.
...Donald R. Peacor; Pete J. Dunn; John S. White; Joel D. Grice; Peter H. Chi Abstract Lithiomarsturite, ideally LiCa 2 Mn 2 HSi 5 O 15 , is a new member of the p-p (pectolite-pyroxene) series of pyroxenoids (hydropyroxenoids). It has a structure based on fünferket-ten , but chain-periodicity faults...
Journal Article
Published: 22 April 2019
Mineralogical Magazine (2019) 83 (3): 473–478.
.... Nagashima M. , Imaoka T. , Fukuda C. and Pettke T. ( 2018 ) Relationship between cation substitution and hydrogen-bond system in hydrous pyroxenoids with three-periodic single-chains of SiO 4 tetrahedra: pectolite, murakamiite, marshallsussmanite, serandite and tanohataite . European...
FIGURES
Image
Compositional fields of <span class="search-highlight">pyroxenoids</span> in the Ca–Mn–(Fe + Mg + Zn) space, with...
Published: 09 October 2019
Fig. 3. Compositional fields of pyroxenoids in the Ca–Mn–(Fe + Mg + Zn) space, with end-member compositions of minerals marked with red stars: Wol – wollastonite, Bust – bustamite, Mnd – mendigite, Fbust – ferrobustamite, Dln – dalnegorskite (Shchipalkina et al ., 2019 a ), Rhd – rhodonite
Image
Fragments of crystal structures of manganese <span class="search-highlight">pyroxenoids</span>: ( a ) bustamite C...
Published: 09 October 2019
Fig. 2. Fragments of crystal structures of manganese pyroxenoids: ( a ) bustamite Ca 3 Mn 3 [Si 3 O 9 ] 2 (Peacor and Buerger, 1962 ); ( b ) rhodonite CaMn 4 [Si 5 O 15 ] (Peacor and Niizeki, 1963 ); and ( c ) pyroxmangite Mn 7 [Si 7 O 21 ] (Ohashi and Finger, 1975 ). The colour of polyhedra
Image
Sample Cr4&#x2F;D3. Interface between johannsenite and a disordered <span class="search-highlight">pyroxenoid</span>. ...
Published: 01 March 2003
Fig. 5. Sample Cr4/D3. Interface between johannsenite and a disordered pyroxenoid. Diffraction patterns of the disordered pyroxenoid (upper right) and johannsenite (lower right) are also given. Beam parallel to [101] of johannsenite.
Image
The edge-sharing “O-chain” in four <span class="search-highlight">pyroxenoids</span>, each of which has different...
Published: 01 November 2016
Figure 4 The edge-sharing “O-chain” in four pyroxenoids, each of which has different T-chain repeat length. The O-chain is interior to the octahedral band and is highlighted in Figures 2a–2d as darker octahedra. ( a ) Wollastonite-1 A ( Ohashi and Finger 1978 ), ( b ) rhodonite ( Peacor et al
Journal Article
Published: 01 April 1978
American Mineralogist (1978) 63 (3-4): 274–288.