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Bernhardt Furniture Company was founded in 1889 by John M. Bernhardt. Until the 1980s, the company was vertically integrated, having a veneer mill, lumber yard and numerous kilns as well as adhesives and particleboard plants. By 1981, Bernhardt began sourcing globally and now has offices in four Asian countries, staffed with 50 employees.
In thin section, quartz grain provenance in a sedimentary rock can be estimated. In crossed polarized light, the quartz grain can go extinct all at once, called monocrystalline quartz, or in waves, called polycrystalline quartz. The extinction in waves is called undulose extinction and indicates dislocation walls in mineral grains. Dislocation ...
Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock.
Planar deformation features in quartz identify it as shocked quartz. Planar deformation features, or PDFs, are optically recognizable microscopic features in grains of silicate minerals (usually quartz or feldspar), consisting of very narrow planes of glassy material arranged in parallel sets that have distinct orientations with respect to the grain's crystal structure.
Sioux Quartzite at Falls Park, Sioux Falls, South Dakota Cross-bedding in the Sioux Quartzite, Blue Mounds State Park, Minnesota, United States.. The Sioux Quartzite is a Proterozoic quartzite that is found in the region around the intersection of Minnesota, South Dakota, and Iowa, and correlates with other rock units throughout the upper midwestern and southwestern United States.
Shocked quartz is a form of quartz that has a microscopic structure that is different from normal quartz. Under intense pressure (but limited temperature), the crystalline structure of quartz is deformed along planes inside the crystal.
The size of the silica particles influences inversions, conversions and other properties of the ceramic body. [7] [8] [9] The presence of other ceramic raw materials can influence the thermal behaviour of quartz, including: Talc promotes the conversion of quartz to cristobalite, and if sufficient alumina is available the formation of cordierite.
Quartz arenite makes up the Prospect Mountain Quartzite on top of Doso Doyabi, Nevada. A quartz arenite or quartzarenite is a sandstone composed of greater than 90% detrital quartz. [1] Quartz arenites are the most mature sedimentary rocks possible, and are often referred to as ultra- or super-mature, and are usually cemented by silica. They ...