Mineralogy

acid aggregates aluminium anions anisotropic argentite arsenic associated axis birefringence calcite calcium carbonates cations chalcopyrite chief chlorides co-ordination colour colourless composition compounds Contains copper corresponding Cryst Crystal forms cubic deposits diadochy DTA curve earth's crust elements exogenetic fibrous fluorite formation g/ton galena granular group includes Group The group H₂O halite hematite hexagonal hydrothermal igneous rocks ionic ions iron isostructural latter layered lustre magmatic magnesium manganese metals metasomatic monoclinic Monoclinic-prismatic Named nickel Occur octahedral optically negative optically positive orthorhombic oxides oxygen pegmatitic pentlandite perfect 010 perfect cleavage phosphates Phys polished section prismatic pyrite pyrrhotine quartz rare refractive indices rutile shown in Fig silicate minerals silicon silicon-oxygen SiO2 solutions specific gravity sphalerite spinel Strongest X-ray diffraction Strongest X-ray lines sulphates sulphosalts supergene Symmetry G tabular temperature tetragonal tetrahedra triclinic trigonal Twins typical usually whereas X-ray diffraction X-ray diffraction lines yellow