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Sunstone is a plagioclase feldspar mineral recognized for its distinctive aventurescence, an optical effect that creates a glittery appearance. This phenomenon is caused by flat, reflective inclusions of hematite, goethite, or copper within the stone. Gem-quality sunstone, particularly copper-bearin...
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Aventurescent feldspar, especially Oregon and fine schiller material, is widely admired; quality varies significantly.
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2
Sunstone is a variety of plagioclase feldspar known for aventurescence, a glittering optical effect produced when light reflects from tiny inclusions inside the mineral. The inclusions can include copper or hematite and may create reddish, orange, or golden flashes when the stone is viewed from part...
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