Where is Stilbite on Basalt found?
Stilbite-Ca (NaCa2Al5Si13O36·14H2O) on Basalt
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Open the appStilbite on 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 Stilbite on Basalt
Deccan Traps, India
World-renowned for exceptional zeolite specimens, including stilbite, often found in large, aesthetic formations within basaltic cavities.
Nova Scotia, Canada
Coastal basalt cliffs yield excellent stilbite and other zeolite specimens.
Iceland
Volcanic regions with abundant basalt flows are known for various zeolite occurrences, including stilbite.
Faroe Islands
Similar to Iceland, these basaltic islands are a classic locality for zeolites.
Oregon and Washington, USA
Basalt flows in the Pacific Northwest, particularly the Columbia River Basalt Group, contain zeolite-filled vesicles.
Collecting tips
- Look for Vesicular Basalt. Stilbite commonly forms in the gas bubbles (vesicles) of basalt. Search for basaltic outcrops with visible cavities or amygdules.
- Examine Fractures and Veins. Hydrothermal solutions can deposit stilbite along fractures and veins within basalt, so inspect these features carefully.
- Check Road Cuts and Quarries. Fresh exposures of basalt, such as those found in road cuts, construction sites, and quarries, are often good places to find mineralized cavities.
- Identify Associated Minerals. Stilbite often co-occurs with other zeolites (e.g., heulandite, scolecite, analcime) and associated minerals like calcite and apophyllite. Learning to identify these can help locate stilbite.
- Use Proper Tools. A rock hammer, chisels, and safety glasses are essential for carefully extracting specimens from hard basalt without damaging the delicate stilbite crystals.
Quick Check
- Color:
- Stilbite: White, pink, salmon. Basalt: Dark gray to black.
- Luster:
- Stilbite: Pearly to vitreous. Basalt: Dull.
- Streak:
- Stilbite: White. Basalt: Gray to black.
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