GEOGRAPHIC LOCALIZATION
| PROVINCE | Vizcaya |
| TOWNSHIP | Marquina |
MACROSCOPIC DESCRIPTION
Fine grain rock, black colour with some white veins and fossil remains.
MINERAL COMPOSITION
| ESSENTIAL MINERALS | ACCESORY MINERALS |
| 98% Calcite | Clay minerals. |
MICROSCOPIC DESCRIPTION
Abundant organic material with sparitic veins and fossil remains.
PHYSICO-MECHANICAL PROPERTIES
| BULK SPECIFIC GRAVITY | 2,69 g/cm3 |
| APPARENT POROSITY | 0,47% |
| ABSORPTION COEFFICIENT | 0,17% |
| COMPRESSION STRENGTH | 629 Kg/cm2 |
| BENDING STRENGTH | 136 Kg/cm2 |
| C. STRENGTH AFTER FREEZING TEST | 595 Kg/cm2 |
| FRICTIONAL WEAR TEST | 2,90 mm |
| IMPACT TEST | 30 cm |
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