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.
This is a brown to black sludge lime with little veining, sprinkled with ammonites (goniatites) and orthoceras, the shells of fossil cuttlefish. To-day the best known representative of these is the "squids?. The shells and their fragments clearly stand out due to the white colour and can reach sizes up to D = 15 cm.
Limestone is sedimentary rock. In this case, it is a so called sludge lime. The dark colour is caused by organic substances (bitumen). Often, this limestone is generated in an oxygen-deficient environment at the bottom of the sea.
|Structure Type||Slab with Irregular Pattern|
|Synonyms||Fossil Brown, Gallaxy Marron, Marron Etrusco, Erfoud Marrone, Pietra di Erfoud|
|Petrographic Assignment||Limestone with orthoceras and goniatites|
|Age||Devon (Approximately 395 - 345 million years)|
|Colouring Minerals||Calcite, coloured black-brown from carbon substances and small bitumen content|
|Average Hardness||3 (according to Mohs's hardness scale 1-10) / Soft stone|
|Deposit||Rissani near Erfoud / Morocco|