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chemical sedimentary rocks form when minerals precipitate from a solution, usually sea water. halite and gypsum are examples of minerals that precipitate from aqueous solutions to form chemical sedimentary rocks. biochemical sedimentary rocks are composed of accumulations of organic debris. coal oct 01, 2019 rare earth metals consist of the chemically similar elements at the bottom of the periodic table, such as cerium and scandium. despite their name, theyre not rare because theyre often found in other minerals, within the earths crust or, in this case, in coal and coal byproducts.mining matters is a charitable organization dedicated to bringing knowledge and awareness about canadas geology and mineral resources to students, educators and the public. the organization provides current information about rocks, minerals, metals, mining and the diverse career opportunities available in the minerals industry.the first sample was mining refuse extracted at low levels, comprising top soil and overburden, waste-rock, and low-grade minerals. high volumes of these inert materials are found piled in slag heaps in the area around the coalfield the other three samples consisted how is coal formed? the formation of coal takes millions of years, which is why it is an exhaustible and non-renewable natural resource.; It was formed around 300 million years ago when the earth was covered with swampy forests. when plants in these forests- mainly trees, mosses, ferns, and reeds died, they fell into the swamps.