igneous
Basalt with Quartz Vein
Basalt with silicon dioxide (SiO2) inclusion
Hardness: 6-7 (Mohs); Color: Dark grey to black matrix with a yellowish-white vein; Luster: Dull to sub-vitreous; Structure: Aphanitic (fine-grained matrix) with a hydrothermal vein.
- Hardness
- 6-7 (Mohs)
- Color
- Dark grey to black matrix with a yellowish-white vein
- Luster
- Dull to sub-vitreous
Identified More igneous →
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Physical properties
Hardness: 6-7 (Mohs); Color: Dark grey to black matrix with a yellowish-white vein; Luster: Dull to sub-vitreous; Structure: Aphanitic (fine-grained matrix) with a hydrothermal vein.
Formation & geological history
The host rock is an igneous volcanic rock formed from rapid cooling of magnesium-rich and iron-rich lava. The vein formed later when hydrothermal fluids rich in silica filled fractures in the basalt, cooling to form quartz or chalcedony.
Uses & applications
Commonly used as river stones for landscaping, decorative gravel, massage stones, or as a collector's specimen for hobbyists.
Geological facts
The single band across the stone is often referred to in folklore as a 'Wishing Stone' - finding a pebble with a continuous white line circling it is said to bring good luck.
Field identification & locations
Identified by the dark, heavy, fine-grained volcanic matrix and the contrasting lighter mineral band. Commonly found on beaches, in riverbeds, or in volcanic terrains worldwide.
