Where is Quartz Vein in Basalt found?
Quartz (SiO2) and Basalt
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Open the appQuartz Vein in Basalt occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Quartz Vein in Basalt
Columbia River Basalt Group, USA
Extensive flood basalts in the Pacific Northwest, where hydrothermal alteration and quartz veining can be observed in road cuts and river exposures.
Deccan Traps, India
Another large igneous province where basaltic flows are widespread, and secondary mineralization, including quartz veins, can be found.
Iceland
A volcanically active island with abundant basaltic rocks, where geothermal activity leads to widespread hydrothermal alteration and vein formation.
Mid-ocean ridges and ophiolite complexes
Submarine hydrothermal systems associated with basaltic crust often produce quartz veins, which can be observed in uplifted ophiolite sequences on land.
Collecting tips
- Look for contrasts. The white or translucent quartz veins will stand out against the dark basalt. Look for linear features or networks of lighter material cutting through the darker rock.
- Examine fractured zones. Hydrothermal fluids preferentially flow through fractures and faults. Focus your search in areas where the basalt is visibly fractured or sheared.
- Check for associated alteration. The basalt immediately adjacent to the quartz veins may show signs of hydrothermal alteration, such as discoloration, softening, or the presence of other secondary minerals (e.g., chlorite, epidote, zeolites).
- Use a hand lens. A hand lens will help distinguish the glassy luster and crystalline nature of quartz from other infilling minerals like calcite or zeolites.
Quick Check
- Color:
- Dark gray to black basalt with white to colorless veins.
- Luster:
- Dull to sub-vitreous for basalt, vitreous for quartz.
- Streak:
- White for quartz; basalt typically has a grayish-white streak, but is often not practical to streak due to its hardness and fine grain.
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