Amarelo de Negrais
Limestone
Amarelo de Negrais
Limestone
Microcrystalline golden-yellow limestone, calcicalstic and bioclastic with coarse elements and slightly tectonized.
Other Names
Amarelo de Negrais – Nomenclature EN 12440, Lioz Gold
Petrographic Classification
Limestone
Occurrence
Almargem do Bispo – Sintra
Origin
Lisbon
Common Uses
Cladding, preferably for interiors. Furniture tops.
Available Reserves
Rare
Source
Moura, A. C., & Carvalho, C. (2007). Mármores e calcários ornamentais de Portugal. Gestão de Artes Gráficas SA, Amadora. - http://www.lneg.pt/download/7310/index.html
Properties
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Compression breaking load141 Mpa
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Compression breaking load after freezing test110 Mpa
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Bending strength13,9 Mpa
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Volumetric weigth2670 kg/m3
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Water absorption at N.P. conditions0,4 %
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Aparent porosity1,2 %
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Thermal linear expansion coeficient4,4 X 10 -6 perº C
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Abrasion test (Amsler-Laffon_Cappon)2,8 / 20,5 mm
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Impact test: minimum fall height50 - 55 cm
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Note: After 25 frost-defrost cycles the test pieces did not present any modifications in colour or structure.
Companies
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Joaquim Duarte Urmal & Filhos, Lda.Sintra
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SOLANCIS – Sociedade Exploradora de Pedreiras, S.A.Alcobaça
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Marmocazi – Indústria de Mármores, Lda.Sintra
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Mármores Galrão, S.A.Sintra
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Transgranitos – Mármores e Granitos do Alto Tâmega, Lda.Vila Pouca de Aguiar