| Property | Test Method | Value |
| Classification | macroscope / microscope | blue-black, micaceous, fine grain slate |
| Absorption | ASTM C121 | 0.104% |
| Bulk Density | ASTM C97 | 174.4 lb/ft3 |
| Compressive Strength | ASTM C170 | 25,800 lb/in2 |
| Modulus of Rupture | ASTM C120 | 13,000 lb/in2 |
| Modulus of Elasticity | ASTM C120, IITRI | 7,014,000 lb/in2 |
| Toughness | IITRI | 56 in-lb/in2 |
| Flat Slab Strength | RP 477 | 4840 lb load |
| Coefficient of Thermal Expansion | ASTM E228 | 0.0000062 in/in/°F |
| Coefficient of Friction | IITRI | | Natural Cleft: | Dry | | 0.73 | 0.69 | Wet | | 0.73 | 0.69 |
| Sand Rubbed: | Dry | | 0.78 | 0.74 | Wet | | 0.80 | 0.74 |
|
| Abrasive Resistance | ASTM C241 | 13.2 Ha 5-6 nonn’s |
| Fire Resistance | IITRI | 1800°F bloat non-combustable |
| Acid Resistance | ASTM C217 | 0.0018 in |
| Weather Resistance | ASTM C215 IITRI | 29% modulus loss-10% strength loss |
| Durability | RP 477 | 0.004% weight loss-10% strength loss |
| Life Expectancy | observation of existing structures | no visible deterioration or fading apparent |
