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  1. No Access

    Article

    Determination of crystal structure of omphacite

    The chemical formula of omphacite was expressed with (MII MI) (Si, Al)2O6. Cations that occupied the MII site were large cations such as Ca or Na, and Na/Na+Ca ratio ranged from 0.2 to 0.8; the 6-coordinated MI s...

    Qifang Zhang, Zhesheng Ma, Nicheng Shi in Chinese Science Bulletin (1999)

  2. No Access

    Article

    STM study on micromorphology of pyrite and dynamic significance of ore-formation

    A careful scanning tunneling microscope (STM) observation has been made on the micromorphology structure of the crystal faces for a group of pyrites which include two types of pyrite specimens: natural pyrites...

    Rong Ye, Lunshan Zhao, Zhesheng Ma, Yongli Shen, ** Zhao in Chinese Science Bulletin (1999)

  3. No Access

    Article

    Crystal structure refinement of suolunite and its significance to the cement techniques

    Based on the crystal structure refinement, the arrangement and characteristics of the double tetrahedra of Si-O backbone of suolunite have been precisely clarified. The double tetrahedra are isolated, and the ...

    Zhesheng Ma, Nicheng Shi, Guodong Mou, Libing Liao in Chinese Science Bulletin (1999)

  4. No Access

    Article

    Structure refinement of astrophyllite

    The crystal structure of astrophyllite K2Na(Fe, Mn, Mg,□)7[Ti2(Si4O12)2|O3](OH, F)4 has been refined. The dimensions of the triclinic unit cell are: a = 0.5359(2) nm,b = 1.1614(4) nm, c = 1.1861(4) nm, α= 113.16(...

    Zhesheng Ma, Guowu Li, Nicheng Shi, Huyun Zhou… in Science in China Series D: Earth Sciences (2001)

  5. No Access

    Article

    Functional substitution of coordination polyhedron in crystal structure of silicates

    On the bases of the study of comparative crystal chemistry of silicates it has been concluded that the octahedra and square pyramids of Ti-0 and Zr-0 play functional role of tetrahedra of Si-0 in the construct...

    Danian Ye, D. Pushcharovsky, Nicheng Shi… in Science in China Series D: Earth Sciences (2002)

  6. No Access

    Article

    The crystal structure of (Fe4Cr4Ni)9C4

    (Fe4Cr4Ni)9C4 is a metal carbide mineral formed by combination of Fe, Cr and Ni with C. It occurs in a chromite deposit in the Luobusha ophiolite, Tibet. Based on the determination of its crystal structure, th...

    Nicheng Shi, Zhesheng Ma, Ming **ong… in Science in China Series D: Earth Sciences (2005)

  7. No Access

    Article

    Mineralogy and crystal structure determination of Mg-fillowite

    Accurate crystal structure determination of complex phosphate Mg-fillowite.—Na2Ca(Mn4Mg2Fe)7[PO4]6 has been finished. Mg-fillowite occurs in muscovite-pegmatite in the Altay area, **njiang, China. It is of the tr...

    Zhesheng Ma, Nicheng Shi, Danian Ye in Science in China Series D: Earth Sciences (2005)

  8. No Access

    Article

    X-ray diffraction investigation of native Si-Fe alloy minerals from Luobusha, Tibet

    The origin of native Si-Fe alloy mineral is thought to be related with mantle and aerolite. The native Si-Fe alloy minerals from podiform chromites of the Luobusha ophiolite in the Yarlong Zangbo suture zone w...

    Guowu Li, Nicheng Shi, Ming **ong, Zhesheng Ma… in Frontiers of Earth Science in China (2007)