Shale | rock | Britannica
Shale, any of a group of fine-grained, laminated sedimentary rocks consisting of silt- and clay-sized particles. Shale is the most abundant of the sedimentary rocks, accounting for roughly 70 percent of this rock type in the crust of the Earth. Shales are often found with layers of sandstone orHow to test the hardness of rocks at home? - JM,15-10-2019· There are a number of household objects or materials that can be used to test the hardness of rocks at home because they have the hardness identical to the ones used in Moh’s hardness test scale. For determining the hardness of the unknown rock, it is relatively easy to use the objects mentioned in the table since the majority of the minerals have the hardness between 2 and 7.Application of nanoindentation technology for,,01-04-2020· As a multiphase and multicomponent sedimentary rock, shale's elastic properties, such as the elastic modulus, hardness, and fracture toughness, are critical parameters for hydraulic fracturing, wellbore drilling, well completion design and post-hydraulic fracturing analysis.