igneous
Granodiorite Core
Granodiorite
Hardness: 6-7 on Mohs scale. Color: Mottled salt-and-pepper (gray, white, pink, and black). Luster: Phaneritic (crystalline). Structure: Massive, granular. Specific gravity: 2.6-2.7.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled salt-and-pepper (gray, white, pink, and black)
- Luster
- Phaneritic (crystalline)
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled salt-and-pepper (gray, white, pink, and black). Luster: Phaneritic (crystalline). Structure: Massive, granular. Specific gravity: 2.6-2.7.
Formation & geological history
Formed by the slow cooling of silica-rich magma deep underground (plutonic). This specific specimen appears to be a drill core sample, likely pulled from bedrock during geological surveying or construction prep.
Uses & applications
Used in heavy construction, road building, and as dimension stone for countertops or monuments. Drill cores like this are used for site investigation and mineral exploration.
Geological facts
Granodiorite is the main component of the Sierra Nevada batholith in California. It is chemically intermediate between diorite and granite.
Field identification & locations
Identify by its circular, smooth sides indicative of diamond-tipped core drilling. Look for high quartz (>20%) and plagioclase feldspar. Common in mountainous regions with deep-seated tectonic activity.
