igneous or sedimentary
Wishing Stone (Basalt or Mudstone with Quartz/Calcite Veins)
Hydrothermally veined Basalt (SiO2/CaCO3 intrusions)
Hardness: 5-7 (Mohs scale), Color: Dark grey to black matrix with white or cream streaks, Luster: Dull/Earthy matrix with Vitreous veins, Structure: Fine-grained aphanitic with crystalline vein fill.
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Physical properties
Hardness: 5-7 (Mohs scale), Color: Dark grey to black matrix with white or cream streaks, Luster: Dull/Earthy matrix with Vitreous veins, Structure: Fine-grained aphanitic with crystalline vein fill.
Formation & geological history
Formed when molten lava (basalt) cooled or sedimentary mud compacted, followed by tectonic stress creating cracks. Mineral-rich hot fluids (hydrothermal) filled these cracks with quartz or calcite, often during the Cenozoic or Mesozoic eras.
Uses & applications
Primarily used as pocket stones, decorative beach stones, and in New Age or lapidary collecting. Basalt itself is a major industrial aggregate for road construction.
Geological facts
Folklore suggests that if you find a stone with a single white line circling it completely, you can make a wish upon it. These are common shoreline finds due to the varying erosion rates between the hard veins and softer matrix.
Field identification & locations
Identify by looking for a dark, smooth, water-worn pebble bisected by distinct white mineral lines. Common on volcanic or glacial beaches in the Pacific Northwest, New England, and the United Kingdom.
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