Where is Apophyllite with Stilbite found?
Apophyllite Group (KCa4(Si8O20)(F,OH)·8H2O) and Stilbite-Ca (NaCa2(Si7Al2)O18·7H2O)
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Open the appApophyllite with Stilbite 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
Deccan Traps, India
World-renowned for producing exceptional specimens of Apophyllite and Stilbite, particularly from the quarries near Nashik, Pune, and Mumbai in Maharashtra. These occurrences are within the vast basaltic lava flows of the Deccan Traps.
Jalgaon, Maharashtra, India
Specifically known for producing large, well-formed, often green Apophyllite crystals associated with pink or orange Stilbite.
Iceland
Found in basaltic cavities, often with other zeolites.
Faroe Islands
Similar to Iceland, found in volcanic rocks.
Nova Scotia, Canada
Occurs in basaltic flows along the Bay of Fundy.
Oregon, USA
Found in some basaltic occurrences.
Collecting tips
- Look in Volcanic Rocks. Focus on areas with basaltic lava flows, especially those that have undergone hydrothermal alteration. Look for vugs (cavities) or amygdules within the rock.
- Check for Associated Minerals. Apophyllite and Stilbite often occur with other zeolites (e.g., Heulandite, Scolecite, Chabazite) and sometimes Calcite or Quartz. The presence of these can indicate a favorable environment.
- Examine Crystal Habits. Learn to recognize the distinct crystal forms: Apophyllite's pseudo-cubic or pyramidal crystals and Stilbite's characteristic sheaf-like or bow-tie aggregates.
- Observe Luster and Cleavage. Apophyllite's pearly luster on its perfect basal cleavage and Stilbite's vitreous to pearly luster are key identifiers.
- Safety Precautions. When collecting in quarries or volcanic terrains, be aware of unstable rock, sharp edges, and potential for falling debris. Always wear appropriate safety gear, including eye protection and gloves.
Quick Check
- Color:
- Apophyllite: Colorless, white, green. Stilbite: White, pink, orange.
- Luster:
- Vitreous to pearly.
- Streak:
- White for both.
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