When studying rocks, one distinguishing characteristic is a rock’s hardness. Geologists use a hardness scale, called the Moh’s Hardness Scale, which characterizes rocks based on their hardness on a scale of 1 to 10. The scale uses a value of 1 to distinguish the least hard rock and 10 for the hardest. Using this scale on soft coal used for petroleum, which is not technically a rock, puts it at a level of 1 or 1.5. This is an estimate as coal is an organic rock not typically made of minerals like other rocks. There are also other grades of coal that range from medium hardness to hard as well. I would say that the common form of coal used in manufacturing is fragile since it is considered to be soft.
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