igneous
Granite / Arkosic Sandstone (Coarse Igneous or Sedimentary Aggregate)
Granite / Quartz-Feldspar Aggregate
Hardness: 6-7 on Mohs scale. Color: Light grey, white, buff, and speckled with dark minerals. Luster: Vitreous to dull. Texture: Phaneritic/coarse-grained, composed of visible interlocked quartz crystals and feldspar grains with minor biotite/mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Light grey, white, buff, and speckled with dark minerals
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Light grey, white, buff, and speckled with dark minerals. Luster: Vitreous to dull. Texture: Phaneritic/coarse-grained, composed of visible interlocked quartz crystals and feldspar grains with minor biotite/mica.
Formation & geological history
Formed through the slow crystallization of magma beneath the Earth's surface (if plutonic granite) or cemented coarse quartz/feldspar debris (if arkosic sandstone). Commonly associated with continental crustal formations.
Uses & applications
Used widely in construction as crushed stone, dimension stone, building material, and decorative landscaping rock.
Geological facts
Granite makes up the majority of Earth's continental crust. Specimens rich in visible quartz crystals often shimmer brightly under direct light.
Field identification & locations
Identified by its rough, sugary texture with visible crystalline intergrowths of clear quartz and pale feldspar. Found in mountainous granite batholiths, river beds, and gravel deposits globally.
