The floor was a mosaic of jacinth, spinel and sunstone.

Oxygen vacancies are formed and accumulate mainly around Ni ions until the layered-to-spinel phase transition begins.

A ring with a spinel ruby in it dropped out: she recognised the stone-itwas Miss Minerva's ring.

I'm sure it's a spinel.

Here, we study the evolution of size-dependent structure in spinel iron oxide and determine how nanoscale structure influences the growth of NCs.