sedimentary
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
Hardness: 6.5-7 (Mohs scale), Color: golden-brown to dark brown with black patterns, Luster: earthy to vitreous when polished, Crystal structure: cryptocrystalline, Cleavage: none
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: golden-brown to dark brown with black patterns, Luster: earthy to vitreous when polished, Crystal structure: cryptocrystalline, Cleavage: none
Formation & geological history
Formed from ancient fossilized sea shells (usually mollusks) and plant material that were compressed and mineralized with iron oxides and hematite over millions of years.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative carvings, meditation aids, and as a popular specimen for rock collectors.
Geological facts
Also known as Elephant Skin Jasper or Mariam Stone, the unique 'calligraphy' patterns are actually cross-sections of fossilized organic remains. It is found in the Himalayan mountains of India.
Field identification & locations
Identify by its distinctive script-like or swirling brown-on-tan patterns. It feels significantly heavier than plastic imitations due to the iron content and cannot be scratched by a steel knife.
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