Info: Smoky quartz is one of the most common colour variety of quartz. His smoky grey to brown prismatic crystals cannot be mistaken. The biggest smoky quartz crystals reach up to several meters of lenght. The colour of the primarely quartz crystal was made by radioactive waves. Often small crystals of garnet and rutile were found in the mineral.
How to recognize: When Smoky quartz is heated up to 300 - 400 degrees by celsium, he looses his typical brown colour and becomes yellow.
Found: The most famous deposits of smoky quartz were found in Brazil, in Madagascar and Sri Lanka. Big crystals were found in Austria.
| Crystal structure |
| Trigonal |
| Hardness |
| 7 |
| Colour |
| Brown to grey |
| Shine |
| Glass |
