Composition Category of Granite Square Ruler

First of all, we have to explain the advantages of granite square ruler, we can have an accurate understanding of it, we can use it better.

Granite is divided into three different categories: fine granite, medium grain granite, coarse-grained granite. Feldspar crystals having an average diameter of 1/16 to 1/8 inch belong to fine granite, feldspar crystals having an average diameter of 1/4 inch belong to medium grain granite, the last one is feldspar crystals with an average diameter of about 1/2 inch, a larger diameter of the crystal, and some even reach a few centimeters. The density of coarse-grained granite is relatively low.