metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within a metamorphic matrix
Hardness (Quartz): 7 on Mohs scale; Color: Milky white quartz with dark gray/green host rock; Luster: Vitreous (glassy) in veins, dull in matrix; Structure: Macro-crystalline quartz veins; Cleavage: None (conchoidal fracture on quartz).
- Color
- Milky white quartz with dark gray/green host rock
- Luster
- Vitreous (glassy) in veins, dull in matrix
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Physical properties
Hardness (Quartz): 7 on Mohs scale; Color: Milky white quartz with dark gray/green host rock; Luster: Vitreous (glassy) in veins, dull in matrix; Structure: Macro-crystalline quartz veins; Cleavage: None (conchoidal fracture on quartz).
Formation & geological history
Formed by hydrothermal activity where hot, mineral-rich fluids circulate through fractures in existing rock. As fluids cool or pressure drops, silica precipitates as quartz, filling cracks to create veins.
Uses & applications
Quartz is used in glassmaking, electronics, and as an abrasive. Specimens like this are primarily used for geological education or as decorative garden stones.
Geological facts
Quartz is the second most abundant mineral in Earth's crust. Veining like this often signals the presence of mineralization, and in certain regions, quartz veins are the primary host for gold deposits.
Field identification & locations
Identify by looking for white, crystalline bands cutting across a different-colored parent rock. Field identification involves a scratch test (quartz will scratch glass) and noting the contrast in texture between the vein and the matrix.
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