noun
spinel
A mineral name used in geology and gemology. Refers to magnesium aluminium oxide (MgAl₂O₄) or related minerals.
尖晶石は宝石としても知られている。
Spinel is also known as a gemstone.
The kanji 尖 (pointed) and 晶 (crystal) describe the mineral's typical octahedral crystal shape. The reading is Sino-Japanese.