Carbuncle (gemstone)
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Carbuncle is another name for a deep red almandine gemstone that has been cut with a smooth, convex face in a method called cabochon. Traditionally, the term referred to any red gemstone, most often a
A polished almandine stone (garnet)
Red garnet
Garnet
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Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.
Carbuncle (gemstone)
…gemstone that has been cut with a smooth, convex face in a method called cabochon. Traditionally, the term referred to any red gemstone, most often a red garnet. Carbuncles and their chimeras have spanned three millennia. Intermingling red gems until the time of their crystal-chemical definitions at the end of…
Garnet Andradite 20
A sample showing the deep red color garnet can exhibit.
Crystal structure of pyrope garnet: White spheres are oxygen; black is silicon; blue is aluminium; and red is magnesium.
Same view, with ion sizes reduced to better show all ions