igneous
Granite (Core Sample)
Phaneritic Felsic Igneous Rock (Granite)
Hardness: 6-7 (Mohs scale); Color: Light grey to greenish-grey; Luster: Dull to vitreous; Crystal Structure: Phaneritic (medium-grained crystalline); Primary Minerals: Quartz, Feldspar, Mica.
- Hardness
- 6-7 (Mohs scale)
- Color
- Light grey to greenish-grey
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Light grey to greenish-grey; Luster: Dull to vitreous; Crystal Structure: Phaneritic (medium-grained crystalline); Primary Minerals: Quartz, Feldspar, Mica.
Formation & geological history
Formed through the slow cooling of silica-rich magma deep within the Earth's crust (plutonic). Found in the Arabian Shield, these cores likely date back to the Proterozoic Era (approx. 500-900 million years ago).
Uses & applications
In geological engineering, these cores are used for geotechnical assessment of load-bearing capacity for construction. Industrially, granite is used for dimension stone, countertops, and aggregate.
Geological facts
This specific sample is a geotechnical drill core from a ground investigation in Makkah. Borehole cores allow geologists to 'see' the underground stratigraphy without excavating.
Field identification & locations
Identified by its crystalline interlocking texture and hardness. Found in continental shields. Collectors look for solid, un-weathered cylinders; usually obtained from construction sites or geologists.
