A multitude of crystals make up our chakra gemstone platonics - each resonating with a different chakra and element. The variety of shapes that we have are the tetrahedron which represents fire (also spirit), the cube (earth/grounding), the octahedron (air/mental planes), dodecahedron (constellations and heavens/the universe)
The crystals are:
ROOT - RED JASPER
SACRAL - CARNELIAN
SOLAR PLEXUS - GOLD TIGER'S EYE
HEART - GREEN AVENTURINE
THROAT - SODALITE
THRID EYE - AMETHYST
CROWN - CLEAR QUARTZ