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.
Rocks are described as foyaites when they - as a result of only small quantities of silicic acid being present - contain no quartz and only few feldspars. In the case of the igneous Azul Bahia, the feldspars are partially replaced by the blue mineral sodalite; quartz is absent. The deposited sodalite crystals give this exclusive stone its characteristic deep blue colouring. Unfortunately, this colouring blue mineral is sensitive also to weak acids (carbonic acid). Grey discolouring and matt marks may occur in the polish.
Azul Bahia arose from a magma, containing only small quantities of silicic acid, that solidified in the earth crust. As a consequence of the long cooling processes and following assemblage crystallisation of like molecules, the large sodalite crystals were able to build.
|Structure Type||Slab with Irregular Pattern|
|Group||Plutonic rock - Plutonit|
|Petrographic Assignment||Sodalitsyenit granite|
|Age||1.2 billion years (Precambrian)|
|Colouring Minerals||White feldspar, blue sodalite, black biotite, green amphibole|
|Average Hardness||6 (according to Mohs's hardness scale 1-10) / Natural stone|
|Deposit||Brazil - province of Bahia, near the village of Itaju do Colonia|