mineral

Quartz Druzy on Matrix (likely Agate or Jasper)

Silicon Dioxide (SiO2) with various mineral inclusions

Hardness: 7 (Mohs scale); Color: Clear to milky white crystals on a reddish-brown matrix; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal (tiny pyramidal points); Cleavage: None (conchoidal fracture).

Hardness: 7 (Mohs scale)
Color: Clear to milky white crystals on a reddish-brown matrix
Luster: Vitreous (glassy)

Identified March 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids seep into cavities in volcanic or sedimentary rocks. As the fluid cools or evaporates, tiny crystals grow on the surface. These specimens can range from millions to hundreds of millions of years old.

Uses & applications

Primarily used in jewelry (as pendants or rings), metaphysical collections, and as decorative mineral specimens. Quartz itself is used industrially in glassmaking and electronics (piezoelectric properties).

Geological facts

The term 'druzy' (or druse) refers to a coating of fine crystals on a rock surface. In the 19th century, these were often referred to as 'sparkling frost' by early mineralogists. They are popular because they provide high surface area glitter without the need for traditional gemstone faceting.

Field identification & locations

Identify by looking for a 'carpet' of tiny, sparkling crystal points that scratch glass. Commonly found in volcanic geode regions like Brazil, Uruguay, and the Midwestern United States. Collectors should look for undamaged crystal terminations and interesting matrix colors.

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