igneous
Pink Granite
Phaneritic Plutonic Felsic Igneous Rock (Granite)
Hardness: 6–7 Mohs; Color: Pink, salmon, or reddish due to high potassium feldspar content, mixed with gray quartz and black biotite/hornblende; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained, visible crystals);…
- Hardness
- 6–7 Mohs
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6–7 Mohs; Color: Pink, salmon, or reddish due to high potassium feldspar content, mixed with gray quartz and black biotite/hornblende; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained, visible crystals); Cleavage: Individual mineral grains show cleavage (feldspar) or conchoidal fracture (quartz).
Formation & geological history
Formed through the slow cooling and crystallization of molten magma deep within the Earth's crust (plutonic). This process allows large crystals to grow. Granite can date from the Archean Eon to the Cenozoic, commonly found in continental crustal shields and mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, and paving stones. It is also used in monument carving, as crushed stone for road base, and as decorative landscaping rock.
Geological facts
Granite is the most common igneous rock found on Earth's continents. The 'pink' color specifically indicates a high concentration of orthoclase feldspar. Mount Rushmore is carved into a massive granite batholith.
Field identification & locations
Identify in the field by its 'salt and pepper' or 'speckled' appearance and coarse mineral grains that are interlocked. Common in mountainous regions like the Appalachians, Rockies, or the Scottish Highlands. Look for the absence of layering (unlike sedimentary rocks) and high resistance to scratching.
