Igneous
Granite or Granodiorite (Weathered)
Granite
Hardness: 6-7 on Mohs scale (due to quartz and feldspar). Color: mottled grey, black, and tan/brown (weathered). Luster: dull to slightly sparkling (due to mica/quartz). Crystal structure: Phaneritic (visible crystals).
- Hardness
- 6-7 on Mohs scale (due to quartz and feldspar)
- Color
- mottled grey, black, and tan/brown (weathered)
- Luster
- dull to slightly sparkling (due to mica/quartz)
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Physical properties
Hardness: 6-7 on Mohs scale (due to quartz and feldspar). Color: mottled grey, black, and tan/brown (weathered). Luster: dull to slightly sparkling (due to mica/quartz). Crystal structure: Phaneritic (visible crystals).
Formation & geological history
Formed from the slow cooling of magma deep underground (intrusive igneous). Exposed at the surface through uplift and erosion. This specimen shows signs of weathering, giving it a brownish tint.
Uses & applications
Commonly used in construction, monument building, and interior design (countertops, tiles) when unweathered.
Geological facts
Granite constitutes a large portion of the Earth's continental crust. It is highly durable and has been used throughout history for monumental architecture.
Field identification & locations
Identify by its interlocking visible crystals. Look for quartz (grey/clear), feldspar (white, pink, or brownish in this case), and dark minerals like biotite or hornblende. Commonly found in mountainous regions or areas with glacial deposits.
