BORNITE = COLORED COPPER CLAY or COPPER LASER ORE with the chemical formula Cu5FeS4
The COPPER content in BORNIT averages over 60%
Bluish-bronze to violet with colorful tarnish - the gold-colored parts are CHALCOPYRIT.
Our pieces are purely NATURAL and not acid-treated, as is usually the case to enhance the colors.
The site is the SAN MIGUEL MINE in ZACATECAS - Mexico
Weight: 400 g Dimensions: 10 x 7 x 4 cm