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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.
Carnelian belongs to the cryptocrystalline branch of quartz. Cryptocrystalline, also referred to as chalcedony quartz, includes a variety of other gemstones including agate, onyx and jasper. Carnelian is classified by its distinct color and is defined as a red-orange to brownish-red variety of chalcedony quartz. Carnelian obtains its color through iron impurities that form within colorless quartz crystal.