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Pyrites radiated

Another form of iron disulphide occurs in nature as the mineral marcasitef which possesses a radiated structure and is frequently found as irregular balls on ehalky downs. When broken open the fracture exhibits a fibrous crystalline structure radiating from the centre—whence the name radiated pyrites. The fresh fracture is almost white m colour, and if quite pure the marcasite would probably be quite tin-white in appearance.7 When pure, its density at 25° C. is... [Pg.138]

Suga, S., K. Inoue, M. Taniguchi, S. Shin, M. Seki, K. Sato, and T. Teranishi (1983). Vacuum ultraviolet reflectance spectra and band structures of pyrites (FeS, CoSj and NiSj) and NiO measured with synchrotron radiation. J. Phys. Soc. Japan 52, 1848-56. [Pg.499]

Small, discontinuous veinlets of pyrites, a number of which sometimes radiate from a common center. [Pg.354]

Radiating or divergent Radiating outward from a central point Pyrite suns... [Pg.202]

Coxcomb pyrites EINECS 235-106-8 Iron disulphide Iron sulfide (FeS2) Marcasite Radiated pyrites White iron pyrites, Iron disulfide, a mineral. The term marcasite is also occasionally applied to... [Pg.290]

A schematic drawing of the sensor system employed in the Sortex Ash Monitor is shown in Figure 4. The x-rays emitted by the Pu source irradiate the coal sample and penetrate up to 38 mm. This radiation is absorbed and scattered the fraction backscattered is counted with a gas proportional counter. The aluminum filter is used to compensate for iron fluorescent x-rays, which are excited by the incident x-rays. The filter preferentially absorbs most of the iron fluorescent x-rays ( 6 KeV), and its thickness is chosen based upon the iron content of the coal samples. The aluminum filter also compensates for sulfur variations in the coal. This occurs because a major fraction of sulfur is present as pyrite and the decrease in x-ray backscatter intensity due to sulfur is partially offset by an increase in iron fluorescence. Organic sulfur is generally constant, and it is corrected for in the calibration of the instrument ( 5). [Pg.264]

Shortite [Named after the American mineralogist, Maxwell Naylor Short (1889-1952)1 (ICSD 16495 and PDF 21-1348) Na3Ca,(C03)3 M= 306.16 15.02 wt.%Na 26.18 wt.% Ca 11.77 wt.% C 47.03 wt.% 0 (Nitrates, carbonates, and borates) Orthorhombic a = 496.1 pm b = 1103 pm c= 712pm (Z = 2) P.G.mm2 S.G.Amm2 Biaxial a= 1.531 1.555 r= 1.570 27=75" 3 2600 (2610) Habit wedge-shaped, equant, or short prismatic crystals. Color colorless to pale yellow. Diaphaneity transparent. Luster vitreous. Streak n.a. Geavage (010). Fracture conchoidaL Decon oses in water releasing an insoluble residue of calcium carbonate. Fluorescent under UV radiation. Occurrence with calcite and pyrite. [Pg.855]


See other pages where Pyrites radiated is mentioned: [Pg.180]    [Pg.2]    [Pg.408]    [Pg.1001]    [Pg.46]    [Pg.29]    [Pg.119]    [Pg.358]    [Pg.235]    [Pg.383]    [Pg.205]    [Pg.1068]    [Pg.435]    [Pg.125]    [Pg.286]    [Pg.18]    [Pg.53]    [Pg.16]    [Pg.10]    [Pg.140]    [Pg.66]    [Pg.860]    [Pg.391]    [Pg.398]    [Pg.21]   
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