Mexican Fire Opal Dark 2-10mm Chip - 15-16 Inch Stone Type_Jade periwinkle

periwinkle

It is known for its colors -- dark green and mustardy yellow

Though it is widely known to be untrue

Selenite is a crystal formed from the mineral gypsum

Mexican Fire Opal Dark 2-10mm Chip - 15-16 Inch Stone Type_Jade periwinkle[Use Fire Opal description? This Fire Opal contains both Opal and the rhyolitic host material in which it is formed, which provides sufficient hardness for the stone to be cut. The name Fire Opal is derived from the translucent fiery oranges and reds for which the Opal is known, though it also can occur in dark brown and golden colors. Some specimens of Fire Opal produce iridescent flashes and are referred to as Precious Fire Opal or Firmament Stone.]