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Silicified sandstone, or ‘orthoquartzite’, consists of sand grains fused together with silica. It resembles hardened sugar and some varieties have excellent flaking qualities.
1 lut 2023 · We integrated structural, geomechanical, and petrophysical data to investigate the influence of hydrothermal silicification on the physical properties of a fault zone. The fault affects Precambrian crystalline rocks and porous sandstones in the Rio do Peixe Basin, northeastern Brazil.
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Image: Google Maps. Silicified quartz sandstone is a sandstone formed by silicification of quartz sand. This particular sandstone is characterized by a high quartz sand content of over 90%, while the matrix content of clay minerals is a maximum of 15% [ 1 ].
A major source for Miocene Calvert Formation silicified sandstone (over 600 acres) is located at the mouth of the Choptank River in depths of water ranging from 10 to 30 feet below the modern sea level (see Figure 4).
The ancient silicified sandstone quarries of Gebel Gulab and Gebel Tingar, covering an area of 12 km² on the west bank of the Nile at Aswan, were one of the major sources of this type of stone, which was used for elite and utilitarian products in antiquity. A systematic ...
