minerals. It occurs as a component of rocks such as sandstone and granite, and separately in a variety of forms such as rock crystal, flint, and agate. Some crystalline forms, such as amethyst, are considered gemstones. Quartz is the mineral used to represent a hardness of 7 on the Mohs...
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Clinoptilolite, with the chemical formula of (Na,K)64Al6Si30O72·nH2O, one of most abundant natural zeolites, is found in sedimentary rocks of volcanic origin and occurs with silicate minerals such as feldspar, quartz, other zeolites (members of the tectosilicates subclass), clays (members of...
constituents (Morton, 1985), (3) minerals having a higher density that quartz (which has a density of 2.65 g/cm3) (Elsner, 2010), (4) as clastic grains with specific gravities greater than about 2.9 g/cm3(USGS, 2010), or as minerals with densities exceeding 3 g/cm3(IAEA, ...
Uranium VI sorption experiments involving quartz and clinoptilolite, important mineral phases at the proposed US nuclear waste repository at Yucca Mountain... JD Prikryl,A Jain,DR Turner - 《Journal of Contaminant Hydrology》 被引量: 246发表: 2001年 Gamma irradiation of collagen/mineral mixtures A ...
A second occurrence of waimirite-(Y) is described from the hydrothermally altered quartz-rich microgranite at Jabal Tawlah, Saudi Arabia. Electron microprobe analyses gave the empirical formula (Y0.79Dy0.08Er0.05Gd0.03Ho0.02Tb0.01Tm0.01Yb0.01)∑1.00[F2.85O0.080.07]∑3.00. The crystal structure ...
Although color is an obvious feature of a mineral, it is often an unreliable diagnostic property.Slight impurities in the common mineral quartz, for example, give it a variety of colors, including pink, purple (amethyst), white, and even black.When a mineral, such as quartz, exhibits a var...
A mine consists of regions of economic ore and regions of noneconomic rock, e.g., quartz and feldspar (Berger et al., 2008). These regions are located by drilling, sampling, and analyzing the drill core for Cu. Where possible the noneconomic rock is not mined. When the mine can only...
The flotation behaviour of quartz particles, whose surfaces have been hydrophobized to varying extents with an organosilane compound, has been studied over... R Crawford,J Ralston - 《International Journal of Mineral Processing》 被引量: 317发表: 1988年 Particle–Bubble Attachment in Mineral Flotati...
Atomic force microscopy of atomic-scale ledges and etch pits formed during dissolution of quartz. The processes involved in the dissolution and growth of crystals are closely related. Atomic force microscopy (AFM) of faceted pits (called negative crysta... AJ Gratz,S Manne,PK Hansma - 《Science...