igneous
Weathered, iron-stained granite (possible granitic gneiss)
Granite, a quartz–feldspar–mica plutonic rock; visual identification is uncertain
AI-generated identification · may be incorrectBrown, rough, and granular with visible light and dark mineral grains. Granite minerals are typically Mohs 6–7 (quartz) and 6 (feldspars), with vitreous quartz and a crystalline texture; the specimen’s surface is too weathered to confirm its minerals or cleavage.
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Physical properties
Brown, rough, and granular with visible light and dark mineral grains. Granite minerals are typically Mohs 6–7 (quartz) and 6 (feldspars), with vitreous quartz and a crystalline texture; the specimen’s surface is too weathered to confirm its minerals or cleavage.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, commonly in continental crust; its age cannot be determined from the image.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and landscaping material; this unverified hand specimen has mainly educational or collecting value.
Geological facts
Brown coloring may result from iron-oxide weathering, but the photograph alone cannot establish the rock type with confidence.
Field identification & locations
Look for interlocking grains of quartz, feldspar, and dark mica; a fresh broken surface or magnification would help distinguish granite from gneiss or other rocks. Granites occur worldwide in continental mountain belts and shields.
