a composite crystal form showing an octahedron modified by a pentagonal dodecahedron (also known as a pyritohedron). - graphite stone stock illustrationsA composite crystal form showing an octahedron modified by a pentagonal dodecahedron (also known as a pyritohedron).
the orthorhombic (rhombic) system ,prisma, brachyprisma u. pyramide: a complex combination crystal showing a primary prism body, side faces of a brachy-prism, and a terminal rhombic pyramid. - graphite stone stock illustrationsThe Orthorhombic (Rhombic) System ,Prisma, Brachyprisma u. Pyramide: A complex combination crystal showing a primary prism body, side faces of a brachy-prism, and a terminal rhombic pyramid.
a deltoidal dodecahedron, a 12-faced solid where each face is a kite-shaped deltoid. - graphite stone stock illustrationsA deltoidal dodecahedron, a 12-faced solid where each face is a kite-shaped deltoid.
a hemimorphically developed crystal of tourmaline, showing asymmetrical terminations at the top and bottom. - graphite stone stock illustrationsA hemimorphically developed crystal of tourmaline, showing asymmetrical terminations at the top and bottom.
crystal forms of the tetragonal system ,ditetragonale pyramide: an eight-faced pyramid where each corner of the square base is split into two. - graphite stone stock illustrationsCrystal Forms of the Tetragonal System ,Ditetragonale Pyramide: An eight-faced pyramid where each corner of the square base is split into two.
spinel twin ,contact twin common in the cubic system. two octahedrons are joined on a common plane. this is so characteristic of the mineral spinel that it is officially known as the "spinel law." - graphite stone stock illustrationsSpinel Twin ,contact twin common in the cubic system. Two octahedrons are joined on a common plane. This is so characteristic of the mineral spinel that it is officially known as the "Spinel Law."
prisms combined with rhombohedrons - graphite stone stock illustrationsPrisms combined with rhombohedrons
