Goldstone 4mm Microfaceted Round - 15-16 Inch Rocky Butte it has often been used

it has often been used as a substitute

light gray or black

meaning it becomes magnetically charged from heat or friction

It is an aluminum borosilicate mixed with iron

Goldstone 4mm Microfaceted Round - 15-16 Inch Rocky Butte it has often been usedGoldstone is a manmade material, consisting of opaque rust to red glass with tiny flecks of glittering copper suspended within it. Goldstone was first created during the Italian Renaissance when, as legend has it, a Venetian monk tipped molten copper into a vat of molten glass. When this combination crystallized, the result was glass permeated with thousands of tiny metallic sparkles.