Describing Rock Textures

rock

Mining is the extraction of priceless minerals or other geological materials from the earth, from an ore body, vein or seam. Materials recovered by mining embody base metals, precious metals, iron, uranium, coal, diamonds, limestone, oil shale, rock salt, potash, development mixture and dimension stone.

Familiar examples of non-foliated metamorphic rocks embody marble, soapstone, and serpentine. This department contains quartzite—a metamorphosed form of sandstone—and hornfels. Sedimentary rocks are formed on the earth’s floor by the buildup and cementation of fragments of earlier rocks, minerals, and organisms or as chemical precipitates and natural growths in water (sedimentation). This process causes clastic sediments (items of rock) or natural particles (detritus) to settle and accumulate, or for minerals to chemically precipitate (evaporite) from a solution.

Sandstone is formed from sand, mudstone from mud, and limestone from seashells, diatoms, or bonelike minerals precipitating out of calcium-rich water. The term publish-grunge was coined for the … Read More