Which diamond form is defined by eight equal triangular sides?

Which diamond form is defined by eight equal triangular sides?

• A. Open-pit mining
• B. Old European cut
• C. Octahedron
• D. Normal

Answer: (C)

An octahedron is a diamond crystal form defined by eight faces, all equilateral triangles. In the diamond crystal system, the octahedral form arises naturally, consisting of eight congruent triangular faces arranged with four meeting at each vertex. That is why this form is described as having eight equal triangular sides. The other terms don’t describe a crystal form: open-pit mining is a mining method, Old European cut is a historical facet-cut style, and normal isn’t related to a diamond’s crystal form.

An octahedron is a diamond crystal form defined by eight faces, all equilateral triangles. In the diamond crystal system, the octahedral form arises naturally, consisting of eight congruent triangular faces arranged with four meeting at each vertex. That is why this form is described as having eight equal triangular sides.

The other terms don’t describe a crystal form: open-pit mining is a mining method, Old European cut is a historical facet-cut style, and normal isn’t related to a diamond’s crystal form.