Smoky Quartz is a semiprecious variety of quartz. It's color ranges from light smoky-gray to brown to black and is dichroic (from darker yellow-brown to lighter red-brown) when viewed in polarized light.
The color of Smoky Quartz is heat sensitive and will pale at temperatures above 400-600°F (200-300°C) or by extended exposure to UV light. This loss of color can be reverted by gamma irradiation.
Smoky Quartz is found in many different environments, but is most commonly found in igneous rock pockets and pegmatites.
Black Tourmaline Shorl is exclusively black and is never transparent or translucent. It is the most common form of Tourmaline. It may form in tiny dense needles within a Quartz crystal where it is then known as Tourmalinated Quartz.
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• Photos show all sides.
• Sizes, shapes and colors my vary due to being a natural stone, being hand-carved and/or difference in computer monitors