Where is Ocean Jasper found?
Orbicular Jasper (a variety of Chalcedony)
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Open the appOcean 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 Ocean Jasper
Marovato, Madagascar
The primary and historically significant source of Ocean Jasper. It is found along the northwestern coast of Madagascar, accessible only during low tide by boat. The deposits are within ancient rhyolitic volcanic flows.
Kabamby, Madagascar
A more recently discovered deposit, also in Madagascar, yielding material with slightly different color palettes and orbicular patterns, often with larger orbs and more vibrant colors.
Collecting tips
- Location Specificity. Ocean Jasper is currently known from only two specific locations in Madagascar. Any material marketed as 'Ocean Jasper' from other localities should be viewed with skepticism.
- Orbicular Patterns. The defining characteristic is the presence of distinct, often concentric, spherical patterns. Absence of these patterns suggests it may be a different type of jasper or chalcedony.
- Hardness Test. As a variety of chalcedony, it should scratch glass (Mohs hardness 6.5-7). This helps distinguish it from softer imitations.
- Visual Inspection. Examine for a waxy to vitreous luster on polished surfaces and a wide range of colors and patterns. The patterns are typically well-defined and often appear 'three-dimensional' due to varying mineral inclusions.
Quick Check
- Color:
- Multi-colored with distinct orbicular patterns (greens, yellows, reds, creams, whites, browns, pinks).
- Luster:
- Waxy to vitreous.
- Streak:
- White.
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