sedimentary
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Brown with tan or pinkish flower-like patterns; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brown with tan or pinkish flower-like patterns
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brown with tan or pinkish flower-like patterns; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the process of permineralization, where ancient coral skeletons are replaced by silica-rich water, transforming the organic material into chalcedony or jasper over millions of years (typically Devonian to Cenozoic).
Uses & applications
Primarily used for ornamental purposes, lapidary art, jewelry (cabochons), and as metaphysical healing stones.
Geological facts
The 'flowers' seen in the rock are actually cross-sections of fossilized ancient coral colonies. This specimen has been cut and polished into a 'tower' or hexagonal point shape.
Field identification & locations
Identify in the field by the distinctive star-shaped or floral patterns within a dense, opaque matrix. It is commonly found in Indonesia, Utah (USA), and Morocco.
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