crystal habit
mineralogical term for the visible shape of a mineral
geode
hollow formation inside a rock
anhedral crystal
crystal not bounded by its own crystal faces
euhedral crystal
well-formed crystal with sharp and well developed faces
dendrite
dendritic crystal growth in a typical multi-branching tree-like form
botryoidal
mineral shape
acicular
Crystal habit
lamellar structure
structure of a material containing lamella