rock fragment

rock fragment

[′räk ‚frag·mənt]
(petrology)
A component of a sedimentary rock consisting of polymineralic or polygranular sand grains that are abraded particles of igneous, sedimentary, or metamorphic rocks.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
But chemical analysis of the rock fragment shows it crystallised in a terrestrial-like oxidised system, at terrestrial temperatures, according to research published in the journal Earth and Planetary Science Letters.
Following on from this idea and the above comparisons, a final K-factor GIS raster layer for NSW was produced based on the [K.sub.m] from K_RUSLE, and further adjusted with rock fragment content, referred to as K_[S.sub.t].
Rockburst is a typical geological disaster during underground excavation in high-stress grounds and frequently accompanied with abrupt rock fragment ejection [1-5].
Framework grains: quartz (Qtz), feldspar (Fs), volcanic rock fragment (VRF); cement: calcite (Cal), chlorite coat (Chl-c), analcime (Anl), anhydrite (Adr), quartz overgrowth (Qtz-o), feldspar overgrowth (Fs-o), and hematite (Hem); primary porosity (PP) and secondary porosity (SP).
where [F.sub.R] is resultant force on the rock fragment due to the front blade surface; [F.sub.N] is resultant force on the overcut area due to the rear blade surface; [[PHI].sub.b] is friction angle between the cutting blade and the dense core; [[PHI].sub.B] is friction angle between the cutting blade and the parent rock; g is normal vector of the front blade surface; U is chip removal velocity vector; [g.sub.[beta]] is unit vector normal to the rear blade surface; and [[alpha].sub.[beta]] is unit vector normal to the rear surface of the inward cutting blade.
The average composition of the Somosaguas sands, taking into account the enrichment in quartz grains and reduction in rock fragment grains during transport (Table 4, Fig.
The forms of oxygen in the sample, described earlier this year in the Proceedings of the National Academy of Sciences, clearly identified the rock fragment as a CV3 carbonaceous chondrite, coming from an asteroid born during the earliest days of the solar system, 4.5 billion years ago.
Each count continued until a total of 100 quartz (Q), feldspar (F), and rock fragment (RF) grains were identified to establish the Q/F/RF ratio.
In the 2006 movie, Superman's arch enemy Lex Luthor steals a kryptonite rock fragment from the Metropolis Museum.
Lex Luthor, steals a kryptonite rock fragment from the Metropolis Museum.
(1994) demonstrated that experimental data on the effects of rock fragment cover on soil erosion by water at the interrill plot scale cannot always be used to predict the impact of rock fragment cover on erosion [TABULAR DATA FOR TABLE 1 OMITTED] [TABULAR DATA FOR TABLE 2 OMITTED] rates at larger plot scales.