Mexican Fire Opal Dark 2-10mm Chip - 15-16 Inch Serpentine but occasionally gabbro comes in

but occasionally gabbro comes in oranges and greens

It is named for the Amazon River in Brazil

or black and can be distributed randomly or in bundles or star to like formations

Diopside is a calcium and magnesium silicate mineral

Mexican Fire Opal Dark 2-10mm Chip - 15-16 Inch Serpentine but occasionally gabbro comes in[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.]