igneous
Granite Nodule
Granite (felsic intrusive igneous rock composed mainly of quartz, K-feldspar, and plagioclase)
Hardness 6-7 on Mohs scale. Rough, weathered earthy to dull luster. Pinkish-brown, tan, off-white, and grey specks. Phaneritic to medium-grained texture. Specific gravity around 2.65-2.75.
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Physical properties
Hardness 6-7 on Mohs scale. Rough, weathered earthy to dull luster. Pinkish-brown, tan, off-white, and grey specks. Phaneritic to medium-grained texture. Specific gravity around 2.65-2.75.
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface in intrusive continental environments, typically within batholiths. Weathered into a rounded cobble or nodule by erosion and transport.
Uses & applications
Commonly used in construction, crushed stone, dimension stone for countertops and monuments, decorative landscaping, and basic geology educational collections.
Geological facts
Granite makes up a large portion of the continental crust. Its pink coloration comes from potassium feldspar (orthoclase), while grey/clear parts are quartz.
Field identification & locations
Identify in the field by its grainy texture, presence of visible quartz, feldspar, and mica grains, and high hardness. Commonly found in riverbeds, glacial deposits, and mountainous igneous terrains.
