Pyrite FeS2 Equant Habit Pyrite crystals with equal width, height and length in a cubic, octahedral and dodecahedral shape Cube: 3 cm Galena PbS Equant, blocky Habit Assemblage of galena crystals in their cubic shape Size: 20 cm Flourite CaF2 Equant Habit Flourite crystals with equal width, height and length in a cubic and octahedral shape Top: 8cm Bottom: 3cm each Quartz SiO2 Prismatic Habit One of the most common of crystal Habits being “pencil-like", elongated along one axis Size: 10 cm Carborundum SiC Tabular Habit Broad, flat or book-like crystals Size: 15 cm Calcite - Iceland spar CaCO3 Rhombohedral Habit Bent cubes in which each face of the crystal is a rhombus with no right angles Size: 5 cm each