Granite Specimen Value Guide

This Granite Specimen is a classic example of a coarse-grained igneous rock formed through the slow crystallization of magma beneath the Earth's surface. While this specific piece is a common fieldstone or construction aggregate, granite remains a cornerstone of geological history, used in everything from the Great Pyramid of Giza to modern architecture.

What Is Granite Specimen Worth?

• Specimen size and the clarity of the crystalline structure within the rock.
• The specific ratio and color of the constituent minerals like Feldspar and Mica.
• Source location within the United States, though common fieldstone typically holds minimal monetary value.
• Physical condition, specifically whether the specimen is a raw fragment or a polished sample.

How to Identify Granite Specimen?

• Look for a distinct 'salt and pepper' appearance created by the interlocking mineral grains.
• Identify the presence of translucent Quartz, opaque Feldspar, and shimmering flakes of Mica.
• Check for a coarse-grained texture where individual mineral crystals are visible to the naked eye.
• Verify the hardness; authentic granite is a very hard rock that cannot be easily scratched by a steel knife.

History of Granite Specimen

Granite is formed from the slow crystallization of magma below the Earth's surface. It has been used for thousands of years in everything from ancient Egyptian monuments like the Great Pyramid of Giza to modern architectural surfaces. This specific piece appears to be a common fieldstone or construction aggregate sample.