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 of about 85-90 % quartz, the fine grains of which are intensely meshed with each other. This is the reason for high wear resistance and low porosity. The fine scaly mica (sericite) can hardly be detected in contrast to the colouring minerals dumortierite (aluminium boron silicate) and kyanite (aluminium boron silicate).
The original rocks are sandstone. These have changed during the folding up period of a high mountain under high pressure and temperature into dense, possible to polish, extremely wear and acid resistant quartzite.
|Structure Type||Slab with Irregular Pattern|
|Age||> 570 million years (Precambrian)|
|Colouring Minerals||Small proportions of dumortierite and kyanite (= disthene) colour blue to lightly violet|
|Average Hardness||7 (according to Mohs’s hardness scale 1-10)|
|Deposit||Brazil / Bahia, near Boquira|