Topic
Silicate minerals
About: Silicate minerals is a research topic. Over the lifetime, 1794 publications have been published within this topic receiving 67064 citations.
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TL;DR: Ashes from Oldoinyo Lengai were collected four days after the onset of the recent explosive episode (i.e., on September 7th 2007). The ash is composed of poorly-vesicular natrocarbonatite droplets, vesicular microcrystalline nephelinite shards, and a mixed variety containing both silicate and carbonate minerals in variable proportions as discussed by the authors.
26 citations
TL;DR: The second part of an ongoing investigation to recover and upgrade rare earth elements (REE) minerals from iron oxide-silicate rich tailings (IST) generated at a South Australian mining operation is presented in this paper.
26 citations
TL;DR: In this paper, a discussion of the relationship between chemical reaction and chemisorption as pertaining to silicate minerals is presented, and it is concluded that the mineral assemblage can represent a condition of thermodynamic equilibrium which may be as important as the usual therodynamic equilibrium.
Abstract: A discussion of the relationships between chemical reaction and chemisorption as pertaining to silicate minerals is presented. Hydration of polymerized silicate surfaces leads to a decrease in the degree of polymerization on the surface regions of the mineral. A different degree of hydration produces a different surface chemistry on the mineral. Correlations are made between the degree of polymerization interruption and the chemistry of the coexisting minerals. The mineral associations of quartz with feldspar, quartz with mus-covite, feldspar with biotite, plagioclase with hornblende, and plagioclase with pyroxene are correlated with the similarities between the surface chemistry of the two minerals. Interface energy of the mineral contacts is interpreted as a controlling factor on the mineralogical composition of a rock and on the mineral distribution in the rock. It is concluded that the mineral assemblage can represent a condition of thermodynamic equilibrium which may be as important as the usual ther...
26 citations
TL;DR: In this paper, it was shown that most or all nitrogen is present as the ammonium ion, substituting to a small extent for alkali ions in the minerals, and these values are confirmed by recent determinations.
Abstract: NITROGEN is one of the most abundant elements in the cosmos; in the Sun, only H, He, O and C exceed it1. In the Earth's crust it ranks only as the thirty-first element in magmatic rocks2, at a level of about 20 p.p.m. Because of the analytic difficulties in determining the nitrogen content of rocks little work has been done in this direction since Lord Rayleigh's determinations3, which gave nitrogen contents in the range of 28 to 68 p.p.m. for a variety of magmatic rocks. These values are confirmed by recent determinations4. Most workers assume, without further proof, that most or all nitrogen is present as the ammonium ion3,5, substituting to a small extent for alkali ions in the minerals.
26 citations
TL;DR: In this article, transmission electron microscope selected area electron diffraction patterns and scanning electron microscope energy dispersive X-ray micro-analysis spectra from thirteen silicate minerals are compared to determine the relative viability of the two methods specifically for differentiating asbestos from non-asbestos minerals.
26 citations