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 rock consists almost exclusively of calcite.
That kind of limestone was generated by deposits of calcereous ooze on the seabed. In case the water was largely oxygen-free, organic material was conserved inform of bitumen. Those hydrocarbons may color the actual bright limestonecompletely black. Posterior tectonic movements caused fractures in the earth’s crust which subsequently were filled by crystalline white calcite. Deposits of ironoxids here and there give it a golden tinge.
|Structure Type||Slab with Irregular Pattern|
|Synonyms||Noir Aziza, Nero Tunis, Nero Dorato|
|Petrographic Assignment||Limestone (Sapropelkalk)|
|Age||300-500 Mio. years (Paläozoikum)|
|Colouring Minerals||A small quantity of bitumen colors the calcite black, limonite (brown iron oxide) gives the veins a golden yellow tinge.|
|Average Hardness||3 (according to Mohs’s hardness scale 1-10)|