Opals
Gemstones
Jewelry
Coins
Oregon Opal Stones
過濾器
關鍵詞
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折扣
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