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Uba Tuba

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.

Petrography

Charnokite is a predominantly dark green plutonic rock similar to granite, the magma of which originates from the transition area between earth crust and upper earth mantle.
At the grain boundaries, gold brown to yellow olive coloured pigmentations can be found, which give the rock a most interesting decor. The yellowish portions have been generated by metamorphosis of hypersthene minerals. Depending on lighting and viewing angle, the feldspar crystals, structured in zones, show slight light reflections. Quartz occurs in rather insignificant quantity in the form of small colourless or light blue-grey crystals. 

Petrogenesis

During the Pre-Cambrian Period (primeval period) huge magma complexes surfaced from the transition zone between earth mantle/earth crust and formed granite or granite-like plutonic rocks. In the case of the Ubatuba massif, a pyroxene and ore-rich type of magma dominated, which settled below the earth crust and crystallised in stable cooling conditions. These deposits were uncovered during the millions of years by movements of the earth crust and erosion. To-day they can be quarried directly below the vegetation cover.

Hardness Hard Stone
Structure Type Homogeneous Structure
Synonyms Ubatuba Gold, Bahia Green, Lincoln, Verde Amazonia
Group Plutonic rock
Petrographic Assignment Granite (charnockite)
Age 1.2 billion years (Precambrian)
Colouring Minerals Dark green-olive feldspar, yellow-olive feldspar, blue-grey quartz, black biotite
Average Hardness 6 (according to Mohs’s hardness scale 1-10)
Deposit Brazil / São Paulo, near Ubatuba