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2023-10-01 11:14 altermaven  
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Rubellite is often mistaken for the precious gemstone ruby. that is because ruby belongs to the corundum family; rubellite is a variant of tourmaline. in fact, rubellite is the rarest variant of tourmaline. in such rarity, it is a prized gemstone, often being more expensive than its ruby counterpart.  
  
being based on tourmaline, the mohs hardness of rubellite is between 7 and 7.5.