mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale). Color: smoky brown to black (Morion). Luster: Vitreous. Crystal structure: Hexagonal/Trigonal. Cleavage: Indistinct. Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: smoky brown to black (Morion)
Luster: Vitreous

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale). Color: smoky brown to black (Morion). Luster: Vitreous. Crystal structure: Hexagonal/Trigonal. Cleavage: Indistinct. Specific Gravity: 2.65.

Formation & geological history

Formed in igneous or metamorphic environments like pegmatites and hydrothermal veins. The color is caused by natural irradiation of aluminum impurities within the crystal structure over millions of years.

Uses & applications

Used primarily in jewelry as a gemstone, as well as in electronics (piezoelectric applications) and as highly valued mineral specimens for collectors.

Geological facts

Black or very dark varieties are specifically called 'Morion'. The color is photosensitive and can fade if left in direct sunlight for extended periods of time.

Field identification & locations

Identify by its smoky translucence, hexagonal prismatic shape, and lack of cleavage. It is commonly found in Brazil (Minas Gerais), Switzerland (Alps), and the USA (Pikes Peak, Colorado).