Spinel often divides gemstones by color and special optical effects. Common varieties are:
(1) Red spinel: mainly containing trace coloring element Cr3+ and red in various shades. Among them, pure red is the most precious gemstone in spinel, which used to be mistaken for ruby. The famous ruby ​​"Black Prince Ruby" and "Tiemuer Ruby" in the British crown, until the modern times, was identified as a spinel.
(2) Blue spinel: it contains Fe2+ and Zn2+ and is blue. Most blue spinels are from dark blue to purple blue, or greenish blue.
(3) Orange spinel: a variety of spinel from orange to orange.
(4) Colorless spinel: very rare. Most natural colorless spinels are more or less pinkish.
(5) Green spinel: generally caused by Fe2+, the color is dark, and some are basically black. The real black spinel is found in Montesanma, Thailand, etc.
(6) Discoloration spinel: very rare. In daylight, it is blue, and under the light of human and industrial light, it is purple.
(7) Starlight spinel: This spinel is generally dark purple to black, with a small number. It can be a star or a star, mainly found in Sri Lanka.
Spinel is a mineral composed of magnesium aluminum oxide. Because it contains magnesium, iron, zinc, manganese and other elements, it can also be classified according to these:
They can be divided into many types, such as aluminum spinel, iron spinel, zinc spinel, manganese spinel, chrome spinel and the like. Due to the different elements, different spinels can have different colors, such as magnesium spinel between red, blue, green, brown or colorless; zinc spinel is dark green; iron spinel is Black and so on. Spinels are hard, glassy octahedrons or granules and blocks. They appear in igneous rocks, granitic pegmatites and metamorphic limestone. Some transparent and beautifully colored spinels can be used as gemstones and some as iron-containing magnetic materials.
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