Silicon atom joined by four oxygen atoms (SiO4) The atomic properties of this molecule cause it to develop a unique three dimensional crystal lattice that is pyramid shaped
The first platonic solid, having four vertices and four sides; attributed to the element of fire, each face symbolizing fire in its different aspects
tetrahedra
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[ "te-tr&-'hE-dr&n ] (noun.) 1570. New Latin, from Late Greek tetraedron, neuter of tetraedros having four faces, from Greek tetra- + hedra seat, face; more at SIT.