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[13] Grupo CONIEX S.A, http://www.coniex.pt/pt/catalogo/go/tratamento-superficies-decapagem-jacto-abrasivo, acedido em 12/05/2013.

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[15] Du, Z., Zhao, D., Jing, L., Cui, G., Jin, M., Li, Y., Liu, X., Liu, Y., Du, H., Guo, C., Zhou, X., Sun, Z.

"Cardiovascular Toxicity of Different Sizes Amorphous Silica Nanoparticles in Rats After Intratracheal Instillation" Cardiovascular Toxicology,2013, pp. 1-14.

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[17] Health Effects of Occupational Exposure to Respirable Crystalline Silica, http://www.cdc.gov/niosh/docs/2002-129/pdfs/2002-129.pdf, acedido em 29/04/2013



FONTE DE IMAGENS:

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[3] http://insighttv.blogspot.pt/2012/08/as-pedras-e-suas-funcoes-parte-i.html, acedido em 29/04/2013
[4]http://www.tjskl.org.cn/images/czae7150-pz24efd97-cristobalite_powder_cristobalite.html, acedido em 29/04/2013
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