igneous
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
Hardness: 6-7 on Mohs scale. Color: Gray, white, speckled with black. Luster: Dull to vitreous depending on mineral grains. Texture: Phaneritic, coarse-grained containing quartz, feldspar, and mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, white, speckled with black
- Luster
- Dull to vitreous depending on mineral grains
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Gray, white, speckled with black. Luster: Dull to vitreous depending on mineral grains. Texture: Phaneritic, coarse-grained containing quartz, feldspar, and mica.
Formation & geological history
The underlying rock is intrusive igneous granite formed by slow cooling of magma. The hemispherical depresssions (cupules or mortars) are man-made archaeological features carved into the rock by ancient humans for grinding seeds, nuts, or rituals, or formed via chemical weathering in natural rock pits (solution pans/tafoni).
Uses & applications
Historically used as grinding stones, acorn/grain processing mortars, or ceremonial petroglyphs. Modern granite is widely used for construction, monuments, and countertops.
Geological facts
Cupules are among the oldest known types of prehistoric rock art/petroglyphs found worldwide. The Urdu text asks 'What do these marks indicate?', referring to these ancient man-made grinding depressions or natural weathering pits filled with rainwater.
Field identification & locations
Identified by phaneritic crystalline granite texture covered in lichen, with smooth circular carved depressions containing rainwater. Commonly found in mountainous or batholithic granite terrains globally.
