砂岩沉积岩中沉积碎屑岩中的砂岩,硅石(石英砂岩、石英岩、石英砂、脉石英)中一种。属玻璃和冶金辅助原料矿产。主要产出地层层位有三:上三叠统须家河组顶部,下侏罗统珍珠冲组和中下侏罗统自流井组底部。 矿石化学成分:二氧化硅97.30一97.32%,氧化铝0.97~1.04%,其0.62~0.67%,q0.034—0.043%,五氧化二磷0.003%。吸水率1.01~2.55%,耐火度1716—1723℃。
大卫·沃克是诺丁汉洞穴勘测组的组长,他负责勘测石头城堡的地基,这是一块位于城市中心的巨型砂岩露头。
David Walker, head of the Nottingham Caves survey, surveys the base of Castle Rock, a large sandstone outcrop in the heart of the city.
沃克说:“诺丁汉市大约有500个砂岩洞穴,许多遗址已禁止游客观光。这些洞穴可以追溯到公元800年的维京时代。”
Nottingham has about 500 sandstone caves, many closed to the public, Walker said. The caves date back to early Viking times in about 800 A.D..
沃克说:“诺丁汉市大约有500个砂岩洞穴,许多遗址已禁止游客观光。”
Nottingham has about 500 sandstone caves, many closed to the public, Walker said.
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