منابع مشابه
Cu- and Mn-bearing tourmalines from Brazil and Mozambique: crystal structures, chemistry and correlations
Cu- and Mn-bearing tourmalines from Brazil and Mozambique were characterised chemically (EMPA and LA-ICP-MS) and by X-ray single-crystal structure refinement. All these samples are rich in Al, Li and F (fluor-elbaite) and contain significant amounts of CuO (up to ~1.8 wt%) and MnO (up to ~3.5 wt%). Structurally investigated samples show a pronounced positive correlation between the distan...
متن کاملNear - Infrared and Mossbauer Study of Cation Site Occupancies in Tourmalines
Mbssbauer and near-infrared spectral measurements have been made on several tourmaline minerals representing both the elbaite-schorl and dravite-schorl series. The specimens were characterized by cell dimension measurements, and by partial chemical analyses by electron microprobe. M'ssbauer data for the iron-bearing specimens further substantiated the presence of ferrous and ferric cations in b...
متن کاملComposition of Tourmalines from Hajiabad and Dehgah area, SE Boroujerd
Tourmaline can be found as an accessory mineral in a variety of rocks including leucogranite, pegmatite, quartz veins, and metamorphiccountry rocks in Hajiabad-Dehgah area in SE of Boroujerd city. Tourmaline in pegmatites is coarse-grained, subhedral to euhedral, anddisplays strong to moderate pleochroic blue rimmed by olive green. In contrast, tourmalines from leucogranite, quartz-veins, and h...
متن کاملArtificial Intelligence for Artificial Artificial Intelligence
Crowdsourcing platforms such as Amazon Mechanical Turk have become popular for a wide variety of human intelligence tasks; however, quality control continues to be a significant challenge. Recently, we propose TURKONTROL, a theoretical model based on POMDPs to optimize iterative, crowdsourced workflows. However, they neither describe how to learn the model parameters, nor show its effectiveness...
متن کاملcomposition of tourmalines from hajiabad and dehgah area, se boroujerd
tourmaline can be found as an accessory mineral in a variety of rocks including leucogranite, pegmatite, quartz veins, and metamorphiccountry rocks in hajiabad-dehgah area in se of boroujerd city. tourmaline in pegmatites is coarse-grained, subhedral to euhedral, anddisplays strong to moderate pleochroic blue rimmed by olive green. in contrast, tourmalines from leucogranite, quartz-veins, and h...
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ژورنال
عنوان ژورنال: Journal of the Franklin Institute
سال: 1863
ISSN: 0016-0032
DOI: 10.1016/s0016-0032(63)90764-6