Where is Blue Chalcedony found?
Chalcedony (a cryptocrystalline variety of Quartz)
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Open the appBlue Chalcedony 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 Blue Chalcedony
Namibia
Known for producing high-quality, often translucent blue chalcedony, sometimes referred to as 'African Blue Chalcedony'.
Turkey
Especially the Eskisehir region, famous for its distinctive, often banded blue chalcedony, sometimes marketed as 'Ankara Blue' or 'Turkish Blue Chalcedony'.
United States
Occurrences in California (e.g., Gem Silica), Oregon, and Arizona, often associated with volcanic activity.
Brazil
Various localities produce blue chalcedony, often in geodes and amygdules.
India
Known for various forms of chalcedony, including blue varieties.
Collecting tips
- Look in Volcanic Terrains. Focus on areas with past or present volcanic activity, particularly where basalts, andesites, or rhyolites are present. Look for geodes, vugs, and veins.
- Examine Cavities and Fissures. Chalcedony often forms as linings or fillings within open spaces in rocks. Inspect weathered rock outcrops for such features.
- Check for Associated Minerals. Blue Chalcedony can be found alongside other silica minerals like quartz, amethyst, and agate, as well as zeolites.
- Observe Luster and Translucency. Its characteristic waxy luster and translucent quality are good indicators. Hold specimens up to light to check for translucency.
Quick Check
- Color:
- Pale to deep blue, often milky or cloudy.
- Luster:
- Waxy to dull, sometimes vitreous.
- Streak:
- White (as with all quartz varieties).
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