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.
Ochre yellow to yellowish brown, coloured by limonite (iron hydroxide), medium to coarse-grained orthogneiss. The black biotite shows in the form of veins of up to 2 cm but can also occur concentrated in the form of streaks, which then gives the stone a contrast-rich, extensive structure. Juparana Classico is one of the rare and most exclusive gneiss varieties of Brazil.
The Juparana types are part of the orthogneiss group, i.e. they were generated by metamorphosis of originally granite rocks. During the Precambrian Period, mountain ranges were formed on the South American Shield. During the course of this process, some rock complexes were lifted and folded up, while others were pushed into deeper regions of the earth crust.
|Structure Type||Slab with Irregular Pattern|
|Synonyms||Juparana Brasile, Yellow Juparana Granite|
|Petrographic Assignment||Gneiss - Orthogneiss|
|Age||1.6 billion years (Precambrian)|
|Colouring Minerals||Ochre-yellow feldspar, coloured by limonite, colourless, light-grey quartz, black biotite|
|Average Hardness||6-7 (according to Mohs's hardness scale 1-10) / Natural stone|
|Deposit||Brazil - several quarries in the neighbourhood of Rio de Janeiro|