Characteristics of Indiana Limestone
Indiana Limestone is a calcite-cemented calcareous stone formed of shells and shell fragments, practically non-crystalline in character. It is found in massive deposits located almost entirely in Lawrence, Monroe, and Owen counties in Indiana. This limestone is characteristically a freestone, without pronounced cleavage planes, possessing a remarkable uniformity of composition, texture, and structure. It has a high internal elasticity, adapting itself without damage from the forces of extreme weather changes and pollution.

This stone combines excellent physical properties with a remarkable degree of machinability. This ease of machining provides complete flexibility of shape and texture at low cost.

Indiana Limestone is usually classified into two colors and four grades based on granular texture and other natural characteristics. When specifying Indiana Limestone it is necessary to identify both the color & grade required as well as the surface finish to be applied to the stone.

Color Descriptions:
   1. Buff – varies from a light creamy shade to a brownish buff
   2. Gray – varies from a light silvery gray to shades of bluish gray

Grade Descriptions:
   1. Select – Fine to average-grained stone having a controlled minimum of “other natural characteristics” and veining.
   2. Standard – Fine to moderately large-grained stone permitting an average amount of “other natural characteristics”
   3. Rustic – Fine to very coarse-grained stone permitting an above-average amount of “other natural characteristics”.
   4. Variegated – An unselected mixture of grades 1 through 3 permitting both buff and gray colors.

“Other natural characteristics” might include a few distinguishable calcite streaks or spots, fossils or shelly formations, pit holes, reedy formations, open texture streaks, honeycomb formations, iron spots, travertine-like formations and grain formation changes.

Since it is impossible to show all “other natural characteristics” by sample the approved sample should be used only as a general guide to final building appearance. Characteristics noticeable at arms length will appear differently when viewed in the building at normal distance.