Crushed Midnight Blue Goldstone Chips (Synthetic), Pea-Sized Gravel (2mm-4mm)

Blue Goldstone is a synthetic, glittering glass that was originally manufactured in Venice during the 17th century. Blue Goldstone is made in a low-oxygen reducing environment and contains tiny crystals of metallic cobalt within a silica matrix. During production, silica, cobalt, and other metal oxides are melted together and then cooled very slowly to form these tiny glittering crystals. Goldstone does polish up nicely and would be great in your inlay or jewelry projects. Our coarse material is considered to be pea-sized gravel, ranging between 4 millimeters to 2 millimeters. Please see the corresponding sediment size chart.  Mineral Properties Mohs’s Hardness: 6 Specific Gravity (g/cm3): 2.5 - 2.8 Luster: Vitreous Color: Midnight Blue, Dark Blue Origin: Synthetic/Man-made This product is man-made. Pictures are taken in full sun and material is dry. Size measurements are using the metric system (millimeters), including the metric ruler (cm/mm) as shown in the product photos.