Azul Valverde

Über Azul Valverde

Azul Valverde is a Jurassic limestone from Pedreira de Azul, Alcanede, Santarém district, Portugal, documented in DNSA as entry #4998. Its characteristic deep blue-grey coloration and fossil-rich texture make it a distinctive decorative stone marketed internationally. DNSA trade names include Azul Cascais, Cinzento Azulado, and Lagos Blue. StoneContact s6809 confirms the identity and origin. The stone is a carbonate sedimentary rock (94% calcite, 6% dolomite), acid-sensitive, with polish possible but polish durability not guaranteed outdoors. Frost compressive strength (130 MPa) is 91% of dry value (143.1 MPa), indicating frost resistance. Full DNSA technical profile: density 2690 kg/m³, compressive strength 143.1 MPa, flexural strength 28.6 MPa, water absorption 0.29%, porosity 0.47%, thermal expansion 0.49 mm/m/100K. Input material group 'Marble' is a market misclassification — correctly classified as limestone per DNSA.