Opals
Gemstones
Jewelry
Coins
Oregon Opal Stones
過濾器
關鍵詞
價格
產品類別
重量 (cts)
長度（毫米）
寬度（毫米）
深度（毫米）
Buy American Opal Oregon Stones
The opals are found in rhyolite geodes (thunder eggs) in a perlite that has altered to pastel colored clay. The geodes that contain gem-quality opal are only about 10% of the total geodes mined and only about 1% of the geodes contain gem-quality opal with play of color. The remaining geodes contain agate, quartz crystals, or common opal. The geodes vary greatly in size, from a few centimetres in diameter to over a meter