The NEGRO MARQUINA is a black and compact rock, with fine grain. LOCATION: The NEGRO MARQUINA is quarried in Spain, in the province of Vizcaya, at the town called Marquina. The NEGRO MARQUINA is a recrystallized limestone reef, with some calcspar veins, and fossil remains.

Any surface finish (polished, bushhammered,...) can be used. This rock must be utilized according to the international laws about limestones that get brightness by polishing.

CARACTERÍSTICAS FÍSICO-MECÁNICAS PHYSICO-MECHANICAL PROPERTIES
Masa volúmica Volumetric weight	2,69 grs/cm3
Coeficiente de absorción Coefficient of absorption	0,17 %
Porosidad Porosity	0,47 %
Resistencia mecánica a la compresión Compression strength	629 Kg/cm2
Resistencia mecánica a la flexión Flexure strength	136 Kg/cm2
Resistencia al desgaste Friction wear resistance	2,90 mm
Resistencia al impacto Impact strength	30 cm
Microdureza Knoop Knoop microhardness	136 Kg/mm2

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