sedimentary
Black Mountain Stone (Seiryu Stone)
Limestone with Calcite veins (CaCO3)
Hardness: 3-4 (Mohs scale); Color: Dark grey to bluish-black with white veining; Luster: Dull/Matte in raw state; Crystal Structure: Trigonal (in veins); Cleavage: Perfect rhombohedral in veins; Specific Gravity: 2.71
- Hardness
- 3-4 (Mohs scale)
- Color
- Dark grey to bluish-black with white veining
- Luster
- Dull/Matte in raw state
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Physical properties
Hardness: 3-4 (Mohs scale); Color: Dark grey to bluish-black with white veining; Luster: Dull/Matte in raw state; Crystal Structure: Trigonal (in veins); Cleavage: Perfect rhombohedral in veins; Specific Gravity: 2.71
Formation & geological history
Formed through the accumulation of organic remains and chemical precipitation in marine environments. The white veins are secondary calcium carbonate deposits that filled cracks in the rock over millions of years.
Uses & applications
Extensively used in aquascaping (landscape design for aquariums), decorative rock gardens, and construction aggregate.
Geological facts
This specific aesthetic, characterized by sharp edges and white veins, is often referred to as 'Seiryu' in the aquarium trade. It can slowly raise the pH and hardness of water through the release of calcium carbonate.
Field identification & locations
Identify by its dark angular faces and distinctive white 'strike' veins. Field identifies by testing with weak acid (like vinegar), which will cause a slight fizzing reaction on the surface.
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