Hexagonal – Hexagonal prism (six-sided)
Common examples include: emerald, galena, quartz, hanksite, vanadinite
Common examples include: emerald, galena, quartz, hanksite, vanadinite
Common examples include: apophyllite, olivine, garnet
Common examples include: gypsum, quartz, plagioclase, staurolite
Common examples include: garnet, pyrite
Common examples include: hedenbergite, quartz
Common examples include: agate (and other chalcedony)
Common examples include: limonite, turquoise, cinnabar, quartz, realgar, lazurite
Common examples include: hemimorphite, elbaite
Common examples include: heulandite, subhedral zircon Amygdules or amygdales (/ÉËmÉȘÉĄdjuËlz, -deÉȘlz/) form when the vesicles (pores from gas bubbles in lava) of a volcanic rock or other extrusive igneous rock are infilled with a secondary mineral, such as calcite, quartz, chlorite, or one of the zeolites. Amygdules usually…
Common examples include: stilbite
Common examples include: feldspar, topaz, vanadinite