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.
Light blue quartz and black pyroxene (hypersthene) together with green alkali feldspar are part of the basic mass of this medium-grain, visibly directional rock. Red garnet crystals appear rather inconspicuous, and as a rule are evenly spread, but are also enriched in nests in some locations. Charnockite tends to brighten during longer acid contact and outside (acid rain) but maintain the polished finish!
Charnockite is found in the lower eroded, crystalline base areas of the continents. Mostly, they are almost entirely free from directional alignment and have the characteristics of plutonic rock. As an exception, a clear directional orientation of the mineral grains can be recognised in this case. Charnockite is mostly of Pre-Cambrian age and, therefore, belongs to the oldest rocks of the earth.
|Structure Type||Slab with Irregular Pattern|
|Petrographic Assignment||Gneiss (Charnockite)|
|Age||570 Million years (Pre-Cambrian)|
|Colouring Minerals||Green alkali feldspar, light blue quartz, black pyroxene (hypersthene, dark red garnet.|
|Average Hardness||6-7 (according to Mohs's hardness scale 1-10)|
|Deposit||Brazil, Braganca Paulista|