metamorphic
Tiger Diamond / Hematite-infused Quartzite
Silicified Hematite-Rich Quartzite (SiO2 + Fe2O3)
Hardness: 6-7 on Mohs scale. Color: Dark gray, black, and silver with golden-brown or yellowish bands. Luster: Metallic to sub-metallic. Texture: Smooth, water-worn, and naturally polished.
- Hardness
- 6-7 on Mohs scale
- Luster
- Metallic to sub-metallic
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Dark gray, black, and silver with golden-brown or yellowish bands. Luster: Metallic to sub-metallic. Texture: Smooth, water-worn, and naturally polished.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone containing iron oxide impurities. The water-rounded shape indicates it was recovered from a high-energy fluvial (river) or coastal environment.
Uses & applications
Primarily used as a decorative stone, pocket stone for collectors, or in lapidary work for cabochons and tumbled jewelry.
Geological facts
This specimen is often referred to locally as 'Tiger Diamond' in certain regions or simply banded hematite-quartz. It exhibits a subtle 'chatoyancy' or silky sheen similar to Tiger's Eye when held under direct light, caused by the alignment of fibrous minerals or iron inclusions within the quartz matrix.
Field identification & locations
Identify in the field by its high specific gravity compared to standard river rocks and its characteristic metallic sheen. Look for it in glacial till or river beds in regions with Precambrian basement rock.
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