and distinctive optical properties
All of our Colombian quartz is completely natural and has had no polishing done
Chalcedony itself is a microcrystalline variety of quartz
there is no organic matter within the stone
It is often used as a gemstone and is known for its various shades of green
Iridescent Goethite from Spain TF2999 size 9.5 and distinctive optical propertiesIridescent Goethite from Spain Approx. Dimensions: 2x3. 25x1. 75 inches Approx. Weight: 242 grams Locality: Filon Sur Mine, Tharsis, Huelva, Spain This specimen is glued to the acrylic base. Weight shown includes the base, but the dimensions are of the actual specimen not including the base. Iridescent goethite specimens from the Filn Sur Mine (Filn Sur open pit, Tharsis Mines, Alosno, Huelva, Andalusia, Spain) are striking collectors minerals