Technical Data for Sequatchie Gray and Varigated Flagstone
| Property | Value |
| Type | Tennessee Quartzite |
| Classification | III quartzite; flagstone |
| Colors | gray or varigated |
| Patterns | random; irregular |
| Finish | natural cleft |
| Absorption | Max. 1.53% |
| Density | Min. 160#/ft |
| Compressive strength (dry or saturated) | Min. 12000# psi |
| Modulus of rupture | 12000 psi |
| Abrasion resistance | 8 |
Chemical Composition
| Alumina | 2.98% |
| Iron oxide | 0.72% |
| Magnesium oxide | 0.42% |
| Titanium oxide | 0.25% |
| Calcium oxide | 0.10% |
| Loss on ignition | 0.60% |
| Silica (by difference) | 94.93% |