Anthracite coal is a high carbonated form of clean-burning coal which is different to the more commonly known "soft coal".
Barite (also spelt barytes) is a mineral composed of barium sulte (BaSO4). It receives its name from the Greek word barys which means "heavy." This name is in response to barite's high specific gravity of 4.5, which is exceptional for a non-metallic
Bauxite is a naturally occurring, heterogeneous weathering product composed primarily of one or more aluminium hydroxide
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