Name this allotrope of carbon that is a very valuable gem.
A common defect with spin polarization in this mineral is the nitrogen-vacancy center. High quality examples of this are classified as first water, while low quality examples are crushing bort. This mineral can be confused with moissanite [mois-sahn-ite], a silicon carbide that, like this material has a very high thermal conductivity. This mineral is ranked above corundum on the Mohs scale, where it is rated a ten. Name this allotrope of carbon that is a very valuable gem.
A common defect with spin polarization in this mineral is the nitrogen-vacancy center.
diamonds