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.
An optically rather variable gneiss with rounded "nests? from mainly yellowish alkaline feldspar (Orthoclase), which can be up to 50% of the rock in some blocks. The darker portions are a mixture of Biotite, Plagioclase and Cordierite. Noticeable are the numerous purple-red garnet crystals which accentuate the coloured appearance. The characteristics regarding the use of this stone are largely identical with those of garnet.
This rock is gneiss form the ancient Pre-Cambrian basic mountain range of the Baltic Shield. The rock has melted in part under action of extreme pressures and temperatures and as a result exhibits a high degree of variability.
Accordingly, every plate is a unique specimen!
|Structure Type||Homogeneous Structure|
|Synonyms||poss Flame Creek|
|Petrographic Assignment||Gneiss (garnet cordierite gneiss)|
|Age||1.8 billion years (Pre-Cambrian)|
|Colouring Minerals||Feldspar (yellowish), Biotite (black), Garnet (red- purple)|
|Average Hardness||6-7 (according to Mohs's hardness scale 1-10)|
|Deposit||Finland (near Sulkava)|