Limestone is characterized by what?

Limestone is a sedimentary marine lagoon, usually gray, black, compact structure aphanitic massive structure, layered, thick-bedded. Main minerals calcite, dolomite minor, also common clay, quartz, feldspar, glauconite, iron oxide, and some biological remains. CaO based chemical ingredients, generally 45% to 55%, such as "Hang ash" marble CaO is 55%; times for MgO, SiO2, Al2O3, but rarely (chemical analysis loss of ignition up to 35% 50%). According to its composition, structure, formation mechanism, contained different impurities can be divided into chemical limestone (limestone that is often referred to), biological limestone, oolitic limestone, clastic limestone.

    Limestone bulk density of about 2.7g / cm3, compressive strength 65 ~ 100MPa, blistering cold dilute hydrochloric acid, Mohs hardness of 3.5 to 5. Porosity of 0.53% ~ 13.36%, 0.09% to 0.7% of water absorption, the degree of saturation of 0.25%, 0.35 coefficient of saturated water, limestone with a certain color, which is a good decorative stone. Such as Hangzhou, "Hang ash", Anhui Lingbi "red Lo Wan", Hubei Huangshi "pink lotus" and marble are limestone products.