Where is Stilbite on Chalcedony with Mordenite found?
Stilbite-Ca, Chalcedony, Mordenite
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Open the appStilbite on Chalcedony with Mordenite 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 Chalcedony with Mordenite
Deccan Traps, India
World-renowned for exceptional zeolite specimens, including stilbite, chalcedony, and mordenite, often found in large, aesthetic combinations within basaltic amygdales.
Poonah (Pune), Maharashtra, India
A classic locality within the Deccan Traps, famous for high-quality stilbite, chalcedony, and mordenite specimens.
Iceland
Volcanic regions yield various zeolites, including stilbite and mordenite, sometimes associated with chalcedony.
Faroe Islands
Similar to Iceland, basaltic flows contain numerous zeolite occurrences.
Oregon and Washington, USA
Basaltic flows in the Pacific Northwest can contain zeolite assemblages, including these minerals.
Collecting tips
- Volcanic Terrains. Focus on areas with basaltic lava flows, especially those with amygdaloidal structures (gas bubbles filled with secondary minerals).
- Hydrothermal Veins. Examine hydrothermal veins cutting through various rock types, as these can host zeolite mineralization.
- Quarries and Road Cuts. These artificial exposures often reveal fresh rock faces where vugs and veins containing these minerals can be found.
- Associated Minerals. Look for other zeolites (e.g., heulandite, scolecite, laumontite), calcite, and quartz, which commonly co-occur.
Quick Check
- Color:
- Stilbite: White, pink, orange. Chalcedony: White, gray, blue. Mordenite: White, pale pink.
- Luster:
- Stilbite: Vitreous to pearly. Chalcedony: Waxy to dull. Mordenite: Silky to vitreous.
- Streak:
- White for all three components.
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