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Fredrich Mohs invented a system to describe and compare hardness of materials What is a narrow channel or slab of a mineral that is sharply different from the surrounding rock? vein The purpose of adding coke to the iron ore in a blast furnace is to heat the iron so that it separates from other elements in the ore The minerals that make up most of the rocks of Earth's crust are called rock forming minerals Stainless steel is an example of a useful alloy A mineral that splits apart easily along flat surfaces has the property cleavage Color alone cannot be used to identify a mineral because only a few minerals always have their own characteristic color Earthy, silky, waxy, metallic, and pearly are terms used to describe a luster The size of a mineral's crystals depends on what? the rate of cooling of the magma or solution from which the mineral formed The softest mineral on the Mohs hardness scale talc Although cement, brick, steel, and glass all come from substances found in Earth's crust, they are not classified as minerals because they are not naturally occurring What is the hardest known mineral? diamond Why is coal not classified as a mineral? it comes from the remains of plants and animals the repeating pattern of a mineral's particles forms a solid called a crystal What is the equation for calculating density? density + mass/volume