Where is Apophyllite with Stilbite and Fluorite found?
KCa4(Si8O20)(F,OH)·8H2O (Apophyllite), NaCa4(Si27Al9)O72·28H2O (Stilbite), CaF2 (Fluorite)
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Open the appApophyllite with Stilbite and Fluorite 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 Apophyllite with Stilbite and Fluorite
Deccan Traps, India
World-renowned for exceptional specimens of apophyllite, stilbite, and other zeolites, often found in large, well-formed crystals within basaltic vugs.
Poonah (Pune), India
A classic locality within the Deccan Traps, famous for its high-quality apophyllite and stilbite specimens.
Jalgaon, Maharashtra, India
Another prominent locality in India, producing excellent combinations of these minerals.
Nova Scotia, Canada
Basalt flows along the Bay of Fundy yield good specimens of apophyllite and stilbite, though often smaller than Indian material.
Iceland
Volcanic areas in Iceland are known for various zeolite minerals, including apophyllite and stilbite.
Mexico
Some localities produce apophyllite and stilbite, sometimes with fluorite, in volcanic settings.
Collecting tips
- Look in Volcanic Rocks. Focus your search on areas with basaltic lava flows, especially those with amygdaloidal structures (cavities filled with secondary minerals).
- Check for Vugs and Veins. These minerals typically form in open spaces. Look for vugs (small cavities) and veins within the host rock.
- Associated Minerals. Apophyllite and stilbite are often found with other zeolites (e.g., heulandite, chabazite), calcite, and quartz. The presence of these can indicate a good collecting environment.
- Careful Extraction. These minerals can be fragile, especially the delicate stilbite aggregates. Use appropriate tools and techniques to avoid damaging specimens.
- Safety Precautions. When collecting in quarries or road cuts, be aware of falling rocks and unstable ground. Wear appropriate safety gear.
Quick Check
- Color:
- Apophyllite: Colorless to pale green/pink. Stilbite: Salmon-pink to orange. Fluorite: Variable, often purple/green.
- Luster:
- Vitreous to pearly.
- Streak:
- White for all three minerals.
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