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

  • Compression breaking load
    141 Mpa
  • Compression breaking load after freezing test
    110 Mpa
  • Bending strength
    13,9 Mpa
  • Volumetric weigth
    2670 kg/m3
  • Water absorption at N.P. conditions
    0,4 %
  • Aparent porosity
    1,2 %
  • Thermal linear expansion coeficient
    4,4 X 10 -6 perº C
  • Abrasion test (Amsler-Laffon_Cappon)
    2,8 / 20,5 mm
  • Impact test: minimum fall height
    50 - 55 cm

  • Note: After 25 frost-defrost cycles the test pieces did not present any modifications in colour or structure.

Companies

Processing
Extraction
  • Joaquim Duarte Urmal & Filhos, Lda.
    Sintra
  • SOLANCIS – Sociedade Exploradora de Pedreiras, S.A.
    Alcobaça
  • Marmocazi – Indústria de Mármores, Lda.
    Sintra
  • Mármores Galrão, S.A.
    Sintra
  • Transgranitos – Mármores e Granitos do Alto Tâmega, Lda.
    Vila Pouca de Aguiar