sedimentary
Quartz Druzy in Brecciated Matrix
Silicon Dioxide (SiO2) in Lithic Breccia
Hardness: 7 (quartz crystals); Color: Clear to white crystals in a grey, tan, and reddish-brown matrix; Luster: Vitreous (crystals) to dull (matrix); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal.
- Hardness
- 7 (quartz crystals)
- Luster
- Vitreous (crystals) to dull (matrix)
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Physical properties
Hardness: 7 (quartz crystals); Color: Clear to white crystals in a grey, tan, and reddish-brown matrix; Luster: Vitreous (crystals) to dull (matrix); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal.
Formation & geological history
Formed through the process of brecciation where rock fragments are cemented together by minerals. The quartz druzy formed later via hydrothermal activity, where silica-rich fluids filled cavities and crystallized over thousands of years.
Uses & applications
Primarily used as decorative display specimens, collector items, and in metaphysical practices. Brecciated rocks are sometimes used for interior stone veneers.
Geological facts
Breccia derives its name from the Italian word for 'loose gravel' or 'stone fragments'. The presence of druzy quartz indicates a secondary enrichment process common in fault zones.
Field identification & locations
Identify in the field by looking for angular rock fragments (clasts) fused together with visible crystalline linings in pockets. Commonly found in tectonic fault zones and hydrothermal vein deposits.
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