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Geometry of Crystal Patterns
The Analysis of Crystals by Xrays
General Principles of Mineral Structures
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albite aluminium amphibole analcite angle aragonite atoms lie axes axial axis brucite calcite calcium atoms cations centre chains cleavage closest packing CO3 group composition compounds contains coordination corners crystal cube cubic cyanite diagram diopside distance double sheet face-centred felspars figure formula four oxygen atoms framework glide plane hedra hexagonal hydroxyl indices ions isomorphous kaolinite Krist lattice layer linked tetrahedra magnesium Mauguin metry mica minerals monoclinic NaCl neighbouring octahedral groups olivine orthoclase Orthorhombic parallel pattern perpendicular photographs positions projected pyrites pyroxene quartz reflection planes replaced rhombohedral rings rotation shown in Fig shows silicates silicon atoms silicon-oxygen sillimanite SiO4 groups six oxygen atoms sodalite sodium space-group space-lattice spinel struc structure is shown sulphur atoms symmetry Taylor tetra tetragonal tetrahedra tetrahedral groups tion tremolite triclinic tridymite ture twinning unit cell valency vertices W. L. Bragg water molecules X-ray X-ray analysis Zeit.f zeolites