Streak - The color of a mineral's powder, fracture - how a mineral breaks apart in an irregular way, Mohs hardness scale - a ranking of minerals from softest to hardest, crystal - the repeating pattern of a mineral's particles in a solid, cleavage - the property of splitting easily along flat surfaces, solution - a mixture in which one substance is dissolved in another, inorganic - formed from materials that were not a part of living,

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