bipyramidal
Two pyramids joined base-to-base
Bipyramidal describes a geometric shape formed by joining two pyramids at their bases, creating a form with two pointed ends.
The term appears most often in chemistry and crystallography to describe molecular structures: The molecule has a trigonal bipyramidal geometry.
A bipyramid looks like two cones meeting at their widest point.
Eight-faced geometric solid
- trigonalThree-angled in form
- hexagonalSix-edged polygon's form
- pentagonalHaving five angles
- tetrahedralHaving four triangular sides
zircon · quartz · fluorite · calcite · spinel · beryl · topaz · garnet
Rotation reference line
- verticesCorner points of shapes
- facesFront of heads
- edgesOuter limits or boundaries
- apexUppermost point or culmination
base · mirror · congruence · polyhedra · dihedral · isometry · invariance · regularity
Organized cooperative movement
- geometryScience of spatial relationships
- orbitalRevolving around another
- ligandMolecule that binds centrally
- hybridizationMixing distinct genetic lines
stereochemistry · chirality · configuration · bonding · electron · valence · isomer · complex
octahedron
Eight-faced geometric solid
- trigonalThree-angled in form
- hexagonalSix-edged polygon's form
- pentagonalHaving five angles
tetrahedral · zircon · quartz · fluorite · calcite · spinel · beryl · topaz · garnet · pyrite
axis
Rotation reference line
apex · base · mirror · congruence · polyhedra · dihedral · isometry · invariance · regularity · alignment
coordination
Organized cooperative movement
- geometryScience of spatial relationships
- orbitalRevolving around another
- ligandMolecule that binds centrally
hybridization · stereochemistry · chirality · configuration · bonding · electron · valence · isomer · complex · octahedral