 | | Journal (issue) | | of XRF, XRD, UV-Vis-NIR and Raman spectroscopy. Mogánite, recognized in 1999 as a silica polymorph, was...XRD, and confirmed by Raman spectroscopy. Mogánite and α-quartz form part of the chalcedony matrix. Mtorolite...used for comparison. Keywords: chrome chalcedony, mogánite, Raman serpentinite, silicification, XRD Introduction...uniform deep green hue. When traversed by later quartz veins the colour grades to brown. spectroscopy, ...Macleod, 1965). The important economic focus of the region is the mining of the huge iron ore deposits occurring |  | Hulsbosch, Niels, Boiron, Marie-Christine, Thomas, Rainer, Van Daele, Johanna, Dewaele, Stijn, Muchez, Philippe (2019) Evaluation of the petrogenetic significance of melt inclusions in pegmatitic schorl-dravite from graphic tourmaline-quartz assemblages: Application of LA-ICP-QMS analyses and volume ratio calculations. Geochimica et Cosmochimica Acta, 244. 308-335 doi:10.1016/j.gca.2018.10.023 | Journal (article/letter/editorial) | | pegmatitic schorl-dravite from graphic tourmaline-quartz assemblages: application of LAICP-QMS analyses...pegmatitic schorl-dravite from graphic tourmaline-quartz assemblages: application of LA-ICPQMS analyses...residual melt, differentiation ABBREVIATIONS: QTM = quartz-tourmaline-muscovite 1 ABSTRACT The composition...inclusions in tourmaline was studied from graphic quartz-tourmaline intergrowth assemblages of common, muscovite...degree of differentiation. The sampled graphic quartz-tourmaline assemblages are the only manifestation |  | | Book | | (clockwise from top left): Quartz Citrine crystal; Fluorite; Vanadanite; Quartz crystal (see text for details)...in groups 8–12, show marked deviation. In this region of the Periodic Table, electronegativity increases...bonded substances, the electrons are confined to the region between the nuclei of the bonded atoms and they...together only by the attraction of Figure 4.1 The quartz crystals (right) are bounded by flat surfaces,...constituent atoms (Madagascar, 13.5 cm). A lump of quartz (left) shows no faces although the atoms within |  | | Journal (issue) | | 1). The recent discoveries of sapphires in the region between Ambilobe and Antsiranana, the former Diego...Gemm., 2006, 30, 3/4,144-154 155 Chrysocolla quartz from the Bacan Archipelago, South Halmahera Regency...Chrysocolla quartz from South Halmahera occurs in a series of basaltic pillow lavas as veins and small...and internal textural pattern. The chrysocolla quartz is cut as cabochons which range in colour from...of chrysocolla and the intergrowth pattern with quartz and chalcedony. Apart from common opaque spots |
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