Where is Orbicular Jasper found?
Orbicular Jasper
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Open the appOrbicular Jasper 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 Orbicular Jasper
Madagascar
Famous for 'Ocean Jasper,' a specific variety of Orbicular Jasper found along the northwest coast. It is known for its vibrant colors and distinct orb patterns, often associated with rhyolitic flows.
California, USA
Various localities, including the Mojave Desert, yield Orbicular Jasper, sometimes referred to as 'Poppy Jasper' or 'Leopard Skin Jasper,' with red, yellow, and brown orbicular patterns.
Mexico
Certain regions produce Orbicular Jasper with unique color combinations and orb structures.
Australia
Some deposits of Orbicular Jasper have been reported, often with earthy tones.
Egypt
Historically, some forms of jasper, potentially including orbicular varieties, were used in ancient Egyptian artifacts.
Collecting tips
- Look for Volcanic or Sedimentary Environments. Orbicular Jasper is often found in areas with a history of volcanic activity or in sedimentary formations rich in silica, such as chert beds or altered tuffs. Look for outcrops with evidence of hydrothermal alteration.
- Examine Riverbeds and Alluvial Deposits. Water erosion can transport jasper from its source. Riverbeds, gravel bars, and alluvial fans can be good places to find tumbled pieces of Orbicular Jasper.
- Identify Distinctive Patterns. The key identifying feature is the presence of spherical or orb-like patterns. Look for rocks with concentric rings or radial structures within a contrasting matrix. Freshly broken surfaces or wet specimens often reveal these patterns more clearly.
- Check for Hardness. Jasper is a hard material (Mohs 6.5-7). It will scratch glass and will not be easily scratched by a steel knife. This helps differentiate it from softer rocks.
- Consult Local Geological Maps. Geological maps can indicate areas known for chert, jasper, or volcanic rocks, which are potential host environments for Orbicular Jasper.
Quick Check
- Color:
- Multi-colored with distinct spherical or orb-like patterns (red, green, yellow, brown, gray, white, black).
- Luster:
- Dull to waxy.
- Streak:
- White.
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