Mexican Fire Opal Dark 2-10mm Chip - 15-16 Inch Multi Rhutilated Quartz Makes 3 sizes of rings:

Makes 3 sizes of rings: 7x9 mm / 0

Hematite is black to steel to gray or silver to gray

and many others

Von Prehn discovered the stone in South Africa in 1774

it occurs in a wide variety of patterns

Mexican Fire Opal Dark 2-10mm Chip - 15-16 Inch Multi Rhutilated Quartz Makes 3 sizes of rings:[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.]