Green ubatuba

Green ubatuba (Port. verde ubatuba) is the commercial name of a Brazilian charnockite, although it is often sold as a granite. It comes from the Ubatuba area of Brazil, where it forms part of the Neoproterozoic Ribeira Belt.[1] As its name indicates, it is green in color, dark green and almost a black appearance when seen in low light. It contains large (10 cm) phenocrysts of alkali feldspar.[2] It is widely used in home renovations and landscaping.

Green ubatuba, polished (size 12x10 cm)

References

Pivko, D. (2003). "Natural stones in Earth's history" (PDF). Acta Geologica Universitatis Comenianae. 58: 73–86. Archived from the original (PDF) on 4 July 2011. Retrieved 28 May 2010.
Vargas, T.; Motoki A.; Neves J.L.P. "Rochas ornamentais do Brasil, seu modo de ocorrencia geologica, varriedade tipologica, explotacao comercial e utilidades como materiais nobres de construcao" (PDF). Revista de Geociências, 2–2 (in Portuguese). UFF. Retrieved 28 May 2010.

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[Pivko-1] Pivko, D. (2003). "Natural stones in Earth's history" (PDF). Acta Geologica Universitatis Comenianae. 58: 73–86. Archived from the original (PDF) on 4 July 2011. Retrieved 28 May 2010.

[Vargas-2] Vargas, T.; Motoki A.; Neves J.L.P. "Rochas ornamentais do Brasil, seu modo de ocorrencia geologica, varriedade tipologica, explotacao comercial e utilidades como materiais nobres de construcao" (PDF). Revista de Geociências, 2–2 (in Portuguese). UFF. Retrieved 28 May 2010.