Black - Slate
Quarry Location: Rahinkkalanvaar, Puolanka, Kotila, Oulu
Water Absorption: 0.23 By weight %
Density: 2860 kg/m3
Flexural Strength: 24 MPa
Compressive Strength: 69 Mpa
Recommended Usage: roof tiles, kitchen and bathroom countertops, monuments, stairs, building stone, ornamental stone, interior, exterior wall and floor applications, mosaic, waterjet pattern
Finishing Surface: Flamed, Bush Hammered, Tumbled, Brushed, Honed, Split, Machine Cut, Natural Surface, Sandblasted, Acid Washing, Combed, Leathered, Water Jet, Filled, Chiseled, Pickling
Additional Names: Puolanka Slate, Lappia Silver, Black Mica Slate
A silver-coloured, folded mica schist from Puolanka.
Schistose and muscovite bearing layers folded in small scale. Quarried and processed like granite.
Mineralogical composition
Muscovite mica:37%
Biotite mica:18%
Quartz:38%