Black Star

Black Star is a fine- and medium-grained, non-foliated black diorite with shades of grey. The light grey, almost white, unsymmetrical patterns are a strong contrast to the black surface, creating a unique surface pattern.

Variation in colour: Average
Weather Resistance: Good
Abrasion Resistance: Good

Quarry site: Vehkajärvi, Kuru
Quarrying began in 1980
Amount of Quarries: 1

Mechanical Properties
Density	2920 kg/m3
Water absorption	0,084 wt %
Compressive strength	171,5 MPa
Flexural strength	25,5 MPa
Hardness	5,2 Mohs

Mineral composition
Plagioclase	48%
Quartz	5%
Biotite	16%
Amphibole	23%