mineral

Rough Quartz Crystal in Matrix

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to milky white crystal points embedded in a brownish-red iron-oxide stained matrix; Luster: Vitreous to dull; Crystal structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture.

Hardness: 7 on Mohs scale
Luster: Vitreous to dull

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where mineral-rich hot water fills cracks and cavities in host rocks (like sandstone or granite). As the water cools, quartz crystals precipitate. These can form in various geological ages from Precambrian to recent.

Uses & applications

Primarily collected as mineral specimens. High-quality quartz is used in electronics (piezoelectricity), glassmaking, and abrasives. Rough pieces like this are often used in metaphysical practices or as basic educational samples.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. This specific specimen appears to be a 'double-terminated' or cluster fragment, likely stained by hematite or limonite which gives the matrix its reddish-brown hue.

Field identification & locations

Identify in the field by its ability to scratch glass and its hexagonal crystal faces. Often found in mountainous regions or areas with volcanic history. Collectors should look for well-defined terminal points and clarity in the crystal areas.

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