mineral

Smoky Quartz (Rough)

Silicon Dioxide (SiO2)

Mohs hardness: 7. Color: translucent brown to gray. Luster: vitreous (glassy) to waxy. Crystal system: Trigonal. Specific gravity: 2.65. Conchoidal fracture.

Hardness: 7
Color: translucent brown to gray
Luster: vitreous (glassy) to waxy

Identified July 3, 2026More mineral →

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Physical properties

Mohs hardness: 7. Color: translucent brown to gray. Luster: vitreous (glassy) to waxy. Crystal system: Trigonal. Specific gravity: 2.65. Conchoidal fracture.

Formation & geological history

Formed in igneous environments like pegmatites or hydrothermal veins. The smoky color is caused by natural irradiation of aluminum-bearing quartz crystals over millions of years.

Uses & applications

Used for jewelry (faceted or cabochons), metaphysical gathering, and industrial uses in electronics or glassmaking if pure.

Geological facts

Smoky quartz is the national gem of Scotland, where it is often called Cairngorm. The color can range from a light yellowish-tan to nearly black (known as Morion).

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and translucent brown tone. Commonly found in riverbeds, mountains, and granite outcrops.