Biggs Jasper
Biggs Jasper is an opaque, dark brown variety of Chalcedony Quartz containing patches or veins of yellow and white quartzite or feldspar. It’s been mined since the 1960s for use in lapidary arts. The common brownish-red color is caused by iron oxide. Biggs Jasper often displays circular patterns formed by concentric circles of mineral deposits. […]