mineral

Smoky quartz (likely citrine/iron-stained quartz)

Quartz, SiO₂; coloration from irradiation and/or iron impurities

AI-generated identification · may be incorrect

Mohs hardness 7; transparent to translucent amber-brown, vitreous luster, conchoidal fracture, no cleavage, trigonal crystal structure, specific gravity about 2.65. The rounded edges suggest a broken or polished specimen rather than a complete crystal.

Identified August 22, 2026More mineral →

Explore Smoky quartz (likely citrine/iron-stained quartz) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms in silica-rich hydrothermal veins, pegmatites, and cavities in igneous rocks; quartz is geologically widespread from Precambrian to modern deposits. The orange-brown color may reflect iron staining or heat treatment, and cannot be confirmed from the image alone.

Uses & applications

Used as a decorative and lapidary stone, jewelry material, and mineral specimen; ordinary pieces have modest value.

Geological facts

Its glassy appearance and curved, shell-like fracture distinguish quartz from calcite, which cleaves readily and is softer. Strong internal fractures and reflective surfaces can create attractive “fire.”

Field identification & locations

Common localities include Brazil, Madagascar, the Alps, and the United States. Confirm with a scratch test against glass (quartz should scratch it), while avoiding damage to a valuable specimen.