Where is Quartz vein in host rock found?
Quartz (SiO2) in a weathered igneous or metamorphic rock
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Open the appQuartz vein in host rock 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 host rock
Sierra Nevada, California, USA
Famous for gold-bearing quartz veins in granitic and metamorphic host rocks, particularly in the 'Mother Lode' region.
Canadian Shield, Canada
Numerous gold and base metal deposits are associated with quartz veins in Archean greenstone belts and granitoid intrusions.
Western Australia
Significant gold mineralization in quartz veins hosted within Archean greenstone belts, such as the Kalgoorlie region.
Cornwall, England
Historically known for tin and copper mineralization in quartz-tourmaline veins within granitic intrusions and surrounding metamorphic aureoles.
Andes Mountains, South America
Extensive precious and base metal deposits in quartz veins associated with magmatic arcs and subduction zones.
Collecting tips
- Look for contrasts. Quartz veins are typically more resistant to weathering than many host rocks. Look for linear ridges or protrusions of white or light-colored rock cutting across darker or more easily eroded host rock.
- Follow float. If you find loose pieces of quartz in an area, follow them uphill. Quartz is durable and often persists as 'float' (loose fragments) long after the host rock has weathered away, leading you to the source vein.
- Examine road cuts and stream beds. These exposures often provide excellent cross-sections of rock formations, making veins easier to spot. Weathering in these environments can also highlight the contrast between the vein and host rock.
- Check for alteration halos. The host rock immediately adjacent to a quartz vein may show signs of hydrothermal alteration, such as discoloration, softening, or the presence of new minerals (e.g., pyrite, sericite). This can be a good indicator of a vein's presence, even if the quartz itself is not immediately obvious.
- Use a rock hammer. Test the hardness of the vein material (quartz is hard, Mohs 7) versus the host rock. Weathered host rock will often be softer and more easily broken.
Quick Check
- Color:
- Milky white to clear (quartz); variable, often discolored (weathered host rock)
- Luster:
- Vitreous (quartz); dull, earthy (weathered host rock)
- Streak:
- White (quartz); variable, often light-colored or absent (weathered host rock)
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