Some of the crystals within the host cavities exhibit a salmon color near their points of contact with the cavity wall. Calcite is conspicuously absent in this uppermost bed. The lower bed in the North Sims Creek area consists of thick bladed crystals, often with curving or complex multiple terminations. The largest celestite crystals obtained from the lower bed reach a length of more than 25 centimeters. Cavities reach a maximum of more than half a meter in diameter and are often filled with thick, intergrown crystals.
Bladed crystals are usually transparent to milky-white on outcrop exposures.
Occasionally the tip of a bladed crystal will exhibit a slight blue or blue-gray tinge. These crystals reach 20 centimeters in length and may weigh several kilograms. The crystals are milky white, translucent and are sometimes coated with calcite crystals. Tabular crystals occur throughout the region and reach perhaps their best development in several beds along Rocky Creek, its tributaries and those of the Lampasas River in Burnet County near Oakalla. The largest unterminated crystals found thus far are 30 centimeters long.