Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and gypsum in gypsiferous sediments. |
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The message in this Note is that reported values of exchangeable calcium for calcareous or gypsiferous soils are usually incorrect. |
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Some areas are mined for the underlying gypsiferous materials that is used for making wall board. |
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The others include the gypsiferous deposits of Lake Estancia and Lake Trinity. |
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Note the rounded boulders in the fluvial sediments, and the mixing of gypsiferous and quartzose lithologies at places on the outcrop. |
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By this mechanism holes, commonly up to 20m deep and 40m or more across, continue to appear suddenly in gypsiferous terranes throughout the world. |
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