 | | Journal (article/letter/editorial) | | an aquatic and aeolian regime. It is mainly the group of heavy minerals that plays the major part among...accessory minerals, and in placer deposits, the latter group of minerals prevails over light minerals, in places...Industrial minerals: marine placers 4.7 7.5 Garnet group Grossular (hessonite, tsavorite), spessartine,...colluvial alluvial-fluvial 4.1 9.0 Spinel Spinel group minerals See corundum 3.6 8.0 Diamonds Diamond...and Witwatersrand, South Proterozoic such as the Tarkwa Ma). World-classLake, deposits are at Witwatersrand |  | | Book (edition) | | terms (see also explanations chapter): - Strunz Group (Strunz (2001; version 9); this provides the mineralogical...optical characteristics or shapes. - The Point Group illustrates how symmetrical a particular mineral...minerals which appear within a particular Strunz sub-group (listed here) or in mineral assemblages of a closely...fast overview and reflect the abbreviated Strunz group. ā¢ Where necessary, abbreviations for important...scheme reflects compositional systematics; the main group is colour-coded on the top right page of the descriptions; |  | | Book | | Origin of Blue Sapphire in Newly Discovered SpinelāChloriteāMuscovite Rocks within Meta-Ultramaļ¬tes of Ilmen...coloured by chromium and sometimes vanadium. The ļ¬rst group of authors in their review proposed an enhanced...These sapphires were formed together with a spinelāchloriteāmuscovite rock during the metasomatic alteration...Origin of Blue Sapphire in Newly Discovered SpinelāChloriteāMuscovite Rocks within Meta-Ultramaļ¬tes of Ilmen...Ferreira, A.C.M. Compositional variation of tourmaline-group minerals in the borborema pegmatite province, northeastern |  | | Book (edition) | | 35 mm, Linopolis, Brazil, H Page 13: Gold, 35 mm.Eagle's est Mine, California, G Publi!>hed by Grdllit...to the chemical formula, allegiance to a mineral group, symmetry and crystal structure as well as the strongest...chemical formula, structure (crystal system, space group, and unit cell dimensions), and at least some other...site occupancy. The Sb members of the tennantite group (2.G) will serve as a good example: tetrahedrite...registered in this book (e.g. in the amphibole group). For more detailed information see "Dana's System |
|
