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Spectrolith

The close-up view of each stone type shows a relatively true image of the crystalline structure and the colouring. This is suitable for grained slabs to a limited extend only. In regard to the colour matching, please take an original sample of the stone from your furniture store as a basis.

Petrography

Anorthosites are almost mono-mineral, massive, medium to large-. grain plutonic rocks and form a sub-group of the gabbro family. They have a basic grey-black to black-green basic shade and, as a rule, consist of labradorite-feldspar. The labradorite crystals of spectrolite show, due through sub-microscopic fine segregation lamella, shimmering light reflections in every colour of the spectrum - but predominantly in blue - and lend the rock its special, optical fascination. 

Petrogenesis

Anorthosites are rarely found as independently existing plutonite complexes but, more frequently, as bands, lenses and layers in large gabbro massifs. On the then Scandinavian Shield, during the Algonkian period (primeval ages), the anorthosite component separated from the gabbro magma through crystallisation over millions of years, then solidified as spectrolite with coarse crystals to giant grains.

Hardness Hard Stone
Structure Type Homogeneous Structure
Synonyms Finlandia Blue, Finnischer Labrador
Group Plutonic rock - Plutonite
Petrographic Assignment Granite - Anorthosite
Age 900 million years (Precambrian)
Colouring Minerals Black-blue labradorite feldspar, grey-beige feldspar, black pyroxene
Average Hardness 6-7 (according to Mohs's hardness scale 1-10) / Natural stone
Deposit Finland - in the south - east, in the neighbourhood of Ylaemaa, near the town of Kuopio