Where is Quartz Vein in Basalt found?
Quartz (SiO2) in 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 associated quartz veining can be observed, particularly in areas of structural deformation.
Deccan Traps, India
One of the largest volcanic provinces globally, basalts here often show evidence of secondary mineralization, including quartz and zeolite infillings.
Iceland
An active volcanic island where basalt is the dominant rock type. Hydrothermal systems are prevalent, leading to various forms of mineralization, including quartz veins.
Oceanic Crust (Mid-Ocean Ridges)
Submarine basalts are frequently altered by hydrothermal circulation, leading to the formation of quartz and other secondary minerals in veins and vesicles.
Collecting tips
- Look for Color Contrast. The most obvious indicator is the stark contrast between the dark basalt and the lighter-colored (white, clear, or milky) quartz veins. These veins can range from hairline fractures to several centimeters or even meters in width.
- Examine Fractures and Voids. Quartz veins typically form in pre-existing fractures, faults, or vesicles (gas bubbles) within the basalt. Look for linear features or filled cavities.
- Check for Hardness. Quartz is significantly harder than most minerals in basalt (Mohs 7). You can test this by attempting to scratch a steel knife or glass with the quartz (it will scratch them) and then attempting to scratch the basalt (it will be harder to scratch the basalt with a knife, but the quartz will scratch the basalt).
- Observe Luster and Fracture. Quartz will exhibit a vitreous (glassy) luster and conchoidal (shell-like) fracture, distinct from the duller luster and more irregular fracture of the basalt matrix.
Quick Check
- Color:
- Dark gray to black basalt with white, clear, or milky veins.
- Luster:
- Basalt: dull to sub-vitreous; Quartz: vitreous.
- Streak:
- Basalt: grayish-white; Quartz: white.
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