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.
The large, blue-grey crystals and a large part of the medium-grain matrix consist of feldspar. The quartz can hardly be differentiated with the naked eye from the feldspar due to similar colouring. Also the black biotite gives little contrast. The rock has no direction orientation.
Plutonic rocks solidified from the blazing heat melts many kilometres under the earth surface in gigantic magma bubbles. As the cooling process under the heat-insulating covering mountains takes a long time, a fully crystalline structure without direction can be generated. Only the hundreds of millions of years of erosion uncovered the plutonic rocks and allow quarrying them to-day.
|Structure Type||Homogeneous Structure|
|Synonyms||Blue Night, Bleu Nuit, Marita Blue|
|Age||300 m. years (Upper Carbonic)|
|Colouring Minerals||Blue-grey feldspar, grey quartz, black biotite|
|Average Hardness||6-7 (according to Mohs's hardness scale 1-10)|
|Deposit||Spain, Badajoz, Barcarrota|