Introduction to the Study of Minerals

12 faces acid albite aluminum aragonite axes of reference Axial plane axis of symmetry barite bead Biaxial Birefringence Blowpipe Blowpipe Tests blue borax c-axis calcite calcium carbonate cent cerussite chalcopyrite charcoal Chemical Composition cleavage closed tube colorless compounds crystalline crystals cube dilute diopside dipyramidal class direction Distinguishing Features edges example extinction fluorite Fusible gives glass green gypsum H₂O Hexagonal dipyramid hexagonal prism hkil HNO3 hornblende igneous rocks index of refraction insoluble interfacial angles interference colors intersection iron isometric lateral axes lattice limestones luster magnetite metallic Microscopic Tests mineral monoclinic Name negative NH4OH occurs Optical Properties orthoclase orthorhombic oxids parallel Pedions plagioclase planes of symmetry positive precipitate prismatic pyramids pyrite quartz reagent represents rhombohedral shown in Fig silicates sodium soluble solution space-lattice specific gravity sphalerite stereographic projection substance sulfids sulfur symbols Tetragonal trapezohedron triclinic Trigonal twin twin-plane usually vertical yellow zone