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Chemistry of the rock‐forming silicates: Ortho, ring, and single‐chain structures
Author(s) -
Papike J. J.
Publication year - 1987
Publication title -
reviews of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 8.087
H-Index - 156
eISSN - 1944-9208
pISSN - 8755-1209
DOI - 10.1029/rg025i007p01483
Subject(s) - mineral , pyroxene , electron microprobe , geology , mineralogy , andradite , silicate , almandine , zircon , silicate minerals , crystal chemistry , topaz , cordierite , geochemistry , kyanite , microprobe , tourmaline , olivine , crystal structure , crystallography , chemistry , metamorphic rock , materials science , skarn , metallurgy , paleontology , quartz , organic chemistry , fluid inclusions , ceramic
The crystal chemistry of 21 ortho, ring, and single‐chain silicate structures is reviewed. Structure drawings are presented to portray the essential crystal chemical features necessary to correctly interpret chemical data for each mineral or mineral group. The groups considered are olivine, humite, zircon, sphene, garnet, vesuvianite, aluminosilicate, topaz, staurolite, chloritoid, epidote, melilite, beryl, cordierite, tourmaline, axinite, pyroxene, pyroxenoid, pectolite, sapphirine, and aenigmatite. Electron microprobe data for each group can be interpreted with various degrees of rigor, depending on whether H 2 O, Fe 2+ /Fe 3+ , and other elements not detected by the microprobe are present. Serious mineral chemists are encouraged to determine Fe 2+ /Fe 3+ and H 2 O directly. Estimates of these values using microprobe data are usually imprecise and can lead to serious errors in interpretation of the chemical formula and thus any thermodynamic or petrologic inferences that are based on the correct formula.