igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
Hardness: 6-7 Mohs; Color: Pinkish-tan to grey; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible interlocking crystals); Cleavage: Indistinct; Specific Gravity: 2.63-2.75.
- Hardness
- 6-7 Mohs
- Color
- Pinkish-tan to grey
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Pinkish-tan to grey; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible interlocking crystals); Cleavage: Indistinct; Specific Gravity: 2.63-2.75.
Formation & geological history
Formed by the slow crystallization of silica-rich magma beneath the Earth's surface (intrusive). This sample displays weathering consistent with fluvial transport (river tumbled), likely originating from an ancient plutonic formation.
Uses & applications
Used extensively in construction (countertops, tiles), crushed stone for road bases, and decorative landscaping. High durability makes it ideal for monuments and architectural facades.
Geological facts
Granite is the most common igneous rock found on the Earth's continental crust. It is the primary component of many mountain ranges and is older than the ocean floor, often dated to hundreds of millions or billions of years.
Field identification & locations
Identify by its phaneritic (granular) texture and hardness; it will scratch glass but cannot be scratched by a steel blade. Commonly found in mountainous regions or as glacial erratic stones in riverbeds and fields.
