Where is Apophyllite with Stilbite and Epidote found?
KCa4(Si8O20)(OH,F)·8H2O (Apophyllite), NaCa4(Si27Al9)O72·28H2O (Stilbite), Ca2(Al,Fe3+)3(SiO4)3(OH) (Epidote)
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Open the appApophyllite with Stilbite and Epidote 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 Epidote
Deccan Traps, India
World-renowned for exceptional specimens of apophyllite and stilbite, often found together in basaltic amygdules. Epidote can also be found in these regions, though less commonly in direct association with the finest zeolite specimens.
Poonah (Pune), India
A classic locality within the Deccan Traps, famous for large, well-formed crystals of apophyllite and stilbite.
Brazil
Various localities produce good quality apophyllite and stilbite, sometimes with epidote, from volcanic and pegmatitic environments.
Iceland
Known for zeolite occurrences, including apophyllite and stilbite, in basaltic lavas.
United States (e.g., Oregon, Washington)
Basalt flows in the Pacific Northwest can yield apophyllite and stilbite, and epidote is common in metamorphic terrains.
Alpine regions (e.g., Switzerland, Austria)
Epidote is a characteristic mineral of the Alps, often found in metamorphic rocks and hydrothermal veins. Apophyllite and stilbite are less common but can occur in specific hydrothermal settings.
Collecting tips
- Look in Volcanic Rocks. Focus on areas with basaltic lava flows, especially those with amygdaloidal textures (cavities filled with secondary minerals).
- Check Hydrothermal Veins. Explore areas with evidence of past hydrothermal activity, such as altered rock zones or quartz veins.
- Examine Metamorphic Terrains. For epidote, search in medium-grade metamorphic rocks like greenschists and amphibolites.
- Use Proper Tools. A rock hammer, chisels, and safety glasses are essential for extracting specimens from hard rock matrices. A hand lens will help identify crystal forms.
- Respect Private Property and Regulations. Always obtain permission before collecting on private land and adhere to all local and national regulations regarding mineral collecting.
Quick Check
- Color:
- Apophyllite: White/pale green. Stilbite: Salmon-pink/orange. Epidote: Pistachio green.
- Luster:
- Vitreous to pearly.
- Streak:
- White (Apophyllite, Stilbite), Grayish-white (Epidote).
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