Where is Aragonite found?
Aragonite (variety 'Spudnik' or 'Moroccan')
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Open the appAragonite 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 Aragonite
Morocco
The 'Moroccan' variety, often synonymous with 'Spudnik' aragonite, is famously found in various localities in Morocco, particularly in the Atlas Mountains region, where it forms spectacular radiating crystal aggregates in geodes and veins.
Spain
Aragonite is the namesake mineral for Molina de Aragón, Spain, where it was first described. Classic localities produce well-formed prismatic crystals.
Slovakia
The Ochtinská Aragonite Cave in Slovakia is a UNESCO World Heritage site known for its unique aragonite formations, including 'aragonite helictites' and 'aragonite flowers'.
United States
Found in various states, including New Mexico (e.g., Santa Eulalia District), Arizona, and California, often in association with volcanic rocks or in cave systems.
Mexico
Significant deposits, often associated with lead-zinc deposits, producing well-crystallized specimens.
Collecting tips
- Look for Cave Environments. Aragonite, especially the 'Spudnik' variety, frequently forms in caves as speleothems (stalactites, stalagmites, helictites, cave flowers). Look for areas with limestone bedrock and active or ancient cave systems.
- Check Hot Spring Deposits. Aragonite can precipitate from hot springs, forming tufa or travertine deposits. Examine these areas for crystalline forms.
- Examine Hydrothermal Veins. In some areas, aragonite forms in hydrothermal veins, often associated with metallic ore deposits. Look for vugs or open spaces within these veins.
- Identify Distinctive Crystal Habit. For 'Spudnik' aragonite, look for the characteristic radiating, needle-like crystals forming spherical or hemispherical aggregates. This habit is quite unique and helps distinguish it from other minerals.
- Perform Acid Test (Carefully). Aragonite, like calcite, will effervesce (fizz) vigorously in dilute hydrochloric acid. This distinguishes it from many other non-carbonate minerals. Always use caution with acids.
Quick Check
- Color:
- White to colorless, light brown, yellow, green, or blue.
- Luster:
- Vitreous to resinous.
- Streak:
- White.
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