sedimentary
Quartz Veined Jasper
Microcrystalline quartz (SiO2) with calcium carbonate or quartz veins
Hardness of 6.5 to 7 on the Mohs scale for the quartz/jasper portions, color is dark brown with prominent white intersecting veins, luster is vitreous to dull, crystal structure is microcrystalline/cryptocrystalline, fracture is conchoidal.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale for the quartz/jasper portions, color is dark brown with prominent white intersecting veins, luster is vitreous to dull, crystal structure is microcrystalline/cryptocrystalline, fracture is conchoidal.
Formation & geological history
Formed when silica-rich fluids or hydrothermal solutions filled fractures and cracks in a pre-existing rock matrix, solidifying into veins over millions of years.
Uses & applications
Used for lapidary work, ornamental carving, tumbling, and as collector specimens.
Geological facts
The distinct white lines are often referred to as 'webbing' or 'fracture filling' and create unique mosaic-like patterns on each stone.
Field identification & locations
Easily identified by the striking contrast between the dark host rock and the bright white mineral veins. Found globally in riverbeds, beaches, and mountainous regions where hydrothermal activity occurred.
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