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Chilblains (/ËtÊÉªlbleÉªnz/) â also known as pernio, Chill Burns and perniosis â is a medical condition that occurs when a predisposed individual is exposed to cold and humidity, causing tissue damage. It is often confused with frostbite and trench foot.
Spinel is a hard vitreous magnesium aluminium oxide that has been used as a gemstone for centuries. The beauty of spinel has caused it to be mistaken for ruby and sapphire in the past. However, spinel deserves to be recognized as a gemstone that is worthy of appreciation in its own right.he name spinel is thought to have come from either the Latin word, spina, meaning thorn, due to its pointed crystal form, or the Greek word for spark, in reference to its bright colour. Spinel has been mined for centuries and one of the most famous historical spinel gemstones is known as the Black Prince's Ruby.