Irish Natural Stone

Irish Blue Limestone was formed some 340 million years ago as a compact crinoidal limestone with a rich fossil content of mainly brachiopods (shellfish) and polyps. Finely dispersed carbon through the stone mass results in a typical blue-grey colour.

Technical Specifications of Irish Blue Limestone by Kilkenny Limestone

Technical Specifications Test Average Value
Apparent Density (kg/m3) EN 1936 2677
Porosity (% vol) EN 13755 0.10
Frost Resistance EN 12371 Frost Resistant (F1)
Thermal Expansion (mm/mK) EN 14581 0,0055
Compressive Strength (N/mm2) EN 1926 136
Flexural Strength (N/mm2) EN 12372 16.8
Wear Resistance (mm) EN 14157 18.4
Ultrasonic Velocity (m/s)   5239


Chemical composition

Over 98% Calcite, 0.7% Dolomite, 0.7% Quarts, 0.2% organic Carbon, Less then 0.1% Iron Sulfite

Due to its extremely low Iron composite content, Irish blue limestone is suitable for use in pressurized urban or industrial environments without risk of compromising the stone through brown discolouration or staining.