Mineral Notes. Mineral = a naturally formed solid substance with a crystal structure, which was not formed from living things. Crystal structure = a definite pattern in the way the particles in a substance are arranged. pyrite. Properties used to identify minerals.
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Mineral = a naturally formed solid substance with a crystal structure, which was not formed from living things.
Crystal structure = a definite pattern in the way the particles in a substance are arranged.
Hardness – ability of a mineral to resist being scratched*a harder mineral will scratch a softer mineral*Friedrich Mohs developed a system for comparing hardness of a mineral to 10 common minerals.
Color – a mineral may be one color or many colors. You cannot identify a mineral by color alone, but color is helpful along with other properties.
Streak – the color of a mineral in powder form. Streak Test = rub mineral across unglazed porcelain
Cleavage and Fracture – minerals break according to how their atoms are arranged.
Cleavage = the tendency of a mineral to break along a flat surface.
Fracture = the tendency of a mineral to break in a way that is not along a flat surface.
Salt = cleavage
Quartz = fracture