metamorphic
Slate with Quartz Vein
Metamorphic pelitic rock with hydrothermal quartz vein
AI-generated identification · may be incorrectHardness 3-4 for slate and 7 for quartz, grey to dark-greenish color with white mineral banding, dull to vitreous luster, foliated cleavage, specific gravity around 2.7.
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Physical properties
Hardness 3-4 for slate and 7 for quartz, grey to dark-greenish color with white mineral banding, dull to vitreous luster, foliated cleavage, specific gravity around 2.7.
Formation & geological history
Formed from low-grade regional metamorphism of shale or mudstone under intense pressure, subsequently intruded by silica-rich hydrothermal fluids forming the quartz vein.
Uses & applications
Used primarily in landscaping, decorative stone, and occasionally as a base for specialized construction or lapidary study.
Geological facts
Slate exhibits prominent rock cleavage allowing it to split into thin, flat sheets, while contrasting quartz veins indicate ancient fluid movement through fractures.
Field identification & locations
Identify in the field by its fine-grained foliated texture, dull grey appearance, and distinct contrasting light-colored mineral intrusions; found globally in mountainous or ancient sedimentary belts.
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