Granite

Physical Properties

Hardness (Mohs scale): 6-7, Color: Pinkish-grey with Mottled Dark spots, Luster: Dull to vitreous, Crystal structure: Phaneritic (coarsegrained), Cleavage: No true cleavage but feldspar within it has cleavage planes.

Formation & Geological History

Formed from the slow crystallization of magma below Earth's surface. This specimen appears to be a water-worn or weathered pebble likely from the Precambrian or Paleozoic era.

Uses & Applications

Commonly used in large scale construction, countertops, monuments, and as crushed stone or aggregate. Small weathered pieces are largely for educational or personal collections.

Geological Facts

Granite is the primary component of the Earth's continental crust. The pink color in this specimen is likely due to the presence of Potassium Feldspar (Orthoclase).

Field Identification & Locations

Identify in the field by checking for a speckled 'salt and pepper' appearance and its extreme hardness; it will easily scratch copper or steel. Found globally in mountainous regions or riverbeds.

Identified on: 5/18/2026

Mode: Standard