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MINERALOGY

MINERALOGY. CRYSTAL SYSTEMS. Symmetry. Mirror Plane = imaginary plane that divides a crystal into halves, each of which is the mirror image of the other.

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MINERALOGY

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  1. MINERALOGY CRYSTAL SYSTEMS

  2. Symmetry Mirror Plane = imaginary plane that divides a crystal into halves, each of which is the mirror image of the other Axis of Rotation = imaginary line through a crystal about which the crystal may be rotated and repeat itself in appearance (1,2,3,4 or 6 times during a complete rotation)

  3. Tips for creating models • Write your name on each model BEFORE folding and taping! • Cut “into” the pattern rather than “around” it. • Fold along each face intersection BEFORE taping into place. • Have fun learning something new!

  4. IsometricSystem c = a  90° 90° 90°   Pyrite, Galena, Halite, Fluorite, Garnet, Diamond ISOMETRIC  =  =  = 90° a = b = c a b = a Unique Symmetry: Four 3-fold axes

  5. TetragonalSystem Wulfenite, Zircon, Chalcopyrite, Rutile  90° 90° 90°   TETRAGONAL  =  =  = 90° a = b  c c  a a b = a Unique Symmetry: One 4-fold axis

  6. a b = a HexagonalSystem Quartz, Beryl (Emerald), Apatite, Graphite, Corumdum (Ruby, Sapphire) c > a HEXAGONAL  = 120°,  =  = 90° a = b  c Unique Symmetry: One 6-fold axis   90° 90° 120° 

  7. OrthorhombicSystem Sulfur, Barite, Olivine, Topaz  90° 90° 90°   ORTHORHOMBIC  =  =  = 90° a  b  c c  a b  a a Unique Symmetry: Three 2-fold axes

  8. MonoclinicSystem Orthoclase, Malachite, Azurite, Gypsum, Mica, Talc  90° 90° 90°   MONOCLINIC  =  = 90°,   90° a  b  c c  a b  a a Unique Symmetry: One 2-fold axis

  9. TriclinicSystem Unique Symmetry: None c  a  a  90° 90° 90°  b  a TRICLINIC       90° a  b  c Turquoise, Plagioclase Kyanite, Albite

  10. Crystal Systems System Axes Angles Unique Symmetry Diagram Examples Isometrica=b=c===90° Four 3-fold Pyrite, Halite, Galena, Garnet, Diamond, Fluorite Tetragonala=bc===90° One 4-fold Wulfenite, Rutile, Zircon, Chalcopyrite Hexagonala=bc=120°, ==90° One 6-fold Quartz, Beryl (Emerald), Apatite, Corundum (Ruby, Sapphire) Orthorhombicabc===90° Three 2-fold Sulfur, Barite, Olivine, Topaz Monoclinicabc==90°, 90° One 2-fold Orthoclase, Malachite, Azurite, Mica, Gypsum , Talc Triclinicabc90° None Turquoise, Kyanite, Albite, Plagioclase

  11. Crystal Systems System Axes Angles Unique Symmetry Diagram Examples Isometric Tetragonal Hexagonal Orthorhombic Monoclinic Triclinic

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