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Lecture 4 - Lecture4 09:21:00...

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Lecture 4 01/02/2008 09:21:00 Largest Crystals: Gypsum Crystals, up to 12m long & 2m wide. Minerals II Cleavage o When things break with parallel planes, its called cleavage. o This is because the bonds are regular structures, say for example a  cube, when hit it is more likely to break on 90 degree angles with the  bonds than at some random angle. Fracture o Irregular breakage. Conchoidal Fracture  o Spherical Line breakage. o Still irregular but with a design. Colors o Caused by impurities in the mineral. These impurities may be other  minerals. o Streak Plate: unglazed porcelain. o You rub a mineral on the streak plate and it will leave behind powder in  the form of a streak on it. Streak color is constant among similar  minerals. Hardness o “Mohs hardness scale” 1-10 o Measured in resistance to scratching.
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