2.75 LB RARE Common Opal Green, Blue, Red, Orange Rough Rock Specimen For Sale

This 2.75 LB rare common opal specimen features a unique mix of green, blue, red, and orange colors. Originating from the United States, this rough rock specimen is perfect for collectors interested in rocks, fossils, and minerals. Its vibrant colors and uncommon nature make it a valuable addition to any collection, showcasing the beauty and diversity of natural materials found in the United States.
Size: 2 pounds 12 ounces6.5\" x 3.5\" x 3.5\"
Common opal, also known as potch opal, is a non-crystalline (amorphous) form of silica containing varying amounts of water. Unlike precious opal, it lacks internal play-of-color, but it frequently occurs in a vibrant spectrum of natural earth tones, greens, and blues due to trace minerals like nickel, chromium, and iron oxides. This specimen displays characteristic conchoidal fracturing, a vitreous-to-waxy luster on its exposed polished or naturally broken faces, and a rugged, iron-stained host matrix enclosing the silica body.