Hardness - Whether an item scratches or is scratched by another item, Color - Not a reliable property for identification because it varies., Streak - The color of a mineral in powdered form, Mineral - An inorganic, naturally occurring solid that has a characteristic chemical composition and orderly internal structure, MOH's Hardness Scale - A 1-10 scale to rank the hardness of minerals , Chemical Composition - The elements that make the mineral, Crystal - A solid whose atoms, ions, or molecules are arranged in a regular, repeating pattern, Solid - The particles cannot move freely., Inorganic - Not living or from living things, Naturally Occurring - Found in nature; not man-made , Density - Mass per volume, Cleavage - Tendency to split along specific planes of weakness to form smooth, flat surfaces , Fracture - Breaks irregularly, Rock - Made of various minerals, may have organic matter, naturally occurring, solid, with no set crystal structure. , Matter - Anything that has mass and takes up space, Luster - The way in which a mineral reflects light, Atom - The smallest unit of an element that maintains the properties of that element, Compound - A substance made up of atoms of two or more different elements joined by chemical bonds,

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