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Baraboo Quartzite
Baraboo Quartzite is a Precambrian geological formation〔Hanson, G. F., (''Geology of the Barabou District, Wisconsin'' ), The University of Wisconsin Extension, 1970, Information Circular 14〕 of quartzite, found in the region of Baraboo, Wisconsin. While pure quartzite is usually white or gray, Baraboo Quartzite is typically dark purple to maroon in color, due to the presence of iron (hematite) and other impurities. Baraboo Quartzite may display strata created by progressive deposition of layers of sand in the original sandstone from which the quartzite was formed (through metamorphism).〔 Specimens of Baraboo quartzite may also display ripple marks that appear visually similar to the patterns one might see in the sand at a beach. Ripples indicate that the sandstone from which the quartzite was metamorphosed was originally water-laid sediment.
Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.
==Uses==
Because of its hardness and angular shape, crushed quartzite is often used as railway ballast.〔(Railroad Ballast )〕
Quartzite is a decorative stone and may be used to cover walls, as roofing tiles, as flooring, and stairsteps. Crushed quartzite is sometimes used in road construction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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