mineral
Smoky Quartz
Silicon Dioxide (SiO2)
Mohs hardness of 7, vitreous luster, hexagonal crystal system, smoky brown to black color due to natural irradiation of aluminum-bearing quartz. Conchodial fracture, no cleavage.
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Physical properties
Mohs hardness of 7, vitreous luster, hexagonal crystal system, smoky brown to black color due to natural irradiation of aluminum-bearing quartz. Conchodial fracture, no cleavage.
Formation & geological history
Formed in igneous and metamorphic rocks, particularly granite and pegmatites. The smoky color is created when free silicon is released from the silicon dioxide by natural radiation.
Uses & applications
Geological display, jewelry (faceted stones and beads), and widely used in metaphysical collections and home decor.
Geological facts
The brown or 'smoky' color is caused by natural gamma radiation from surrounding minerals that interacts with aluminum impurities within the crystal lattice.
Field identification & locations
Can be identified by its characteristic transparency combined with brown/grey tint and hexagonal prism shape. Commonly found in locations like the Swiss Alps, Brazil, and Pikes Peak, Colorado.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral