igneous
K-feldspar Granite / Red Granite Fragment
Alkali feldspar granite (Plutonic igneous rock)
Hardness of 6-7 on the Mohs scale, reddish-pink to orange color due to potassium feldspar, vitreous to dull luster, phaneritic (coarse-grained) crystal structure, specific gravity around 2.65-2.75.
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Physical properties
Hardness of 6-7 on the Mohs scale, reddish-pink to orange color due to potassium feldspar, vitreous to dull luster, phaneritic (coarse-grained) crystal structure, specific gravity around 2.65-2.75.
Formation & geological history
Formed from the slow cooling and crystallization of magma rich in silica and potassium deep beneath the Earth's crust, typically during mountain-building events over millions of years.
Uses & applications
Used in construction, as dimension stone for buildings, monuments, countertops, and by rock collectors.
Geological facts
Granite is the most common igneous rock in the Earth's continental crust. The pink coloration in this specific sample comes from orthoclase or microcline feldspar enriched with iron impurities.
Field identification & locations
Can be identified by its prominent pinkish-red mineral grains mixed with translucent quartz and dark biotite mica. Commonly found in glacial drift, riverbeds, and mountainous regions worldwide.
