Hexagonal – <a href=Hexagonal prism (six-sided)">
Hexagonal – Hexagonal prism (six-sided)

Common examples include: emerald, galena, quartz, hanksite, vanadinite

Equant/Stout – Length, width, and breadth roughly equal

Common examples include: apophyllite, olivine, garnet

Cubic – Cube shape

Common examples include: fluorite, pyrite, galena, halite

Massive/Compact – Shapeless, no distinctive external crystal shape

Common examples include: limonite, turquoise, cinnabar, quartz, realgar, lazurite

Amygdaloidal – Like embedded almonds

Common examples include: heulandite, subhedral zircon Amygdules or amygdales (/əˈmÉȘÉĄdjuːlz, -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…