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Gem Quality, Yellow, Golden Or Orange Colored Quartz.
Smoky quartz is a type of crystalline quartz that comes in a variety of colors. They can range from a light yellow-brown to a dark brown that can even be mistaken for black gemstones due to their intensity.
This beautiful variety of mineral quartz gets its color from its proximity to natural sources of radiation such as radioactive minerals. The coloration can also be artificially produced through the process of irradiation.