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http://www.uniquaria.com/index.php/articles/6-misc/21-aquarium-safe-rocks Safe Rocks: * Crystalline Quartz * (Rock Crystal, Amethyst, Citrine, Rose Quartz, Smokey Quartz) * Granite * Jade * Lava Rock * Microcrystalline Quartz

(Jasper, Agate, Chalcedony, Sard, Carnelian) * Onyx * Petrified Wood * Quartz * Slate Unsafe Rocks: * Coal

(Commercially harvested coal is treated with an oil by-product to reduce dust) * Coral * Dolomite * Fools Gold

(or any other rock with metallic veins--Acid Producing) * Fossils * Limestone * Marble * Sandstone

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