Intro: Portmadoc Welsh Slate (N6)
Reference N6 NAME Portmadoc (honed) TYPE Slate GEOLOGY Ordovician. Llandeilo Series COUNTY Gwynedd COLOUR Blue/grey. Occasional pyrite flecks TEXTURE Extremely fine grained. Finely cleaved BLOCK SIZE LXBXH (mm) SUITABILITY Roofing, cladding, flooring and architectural USES (1) USES (2) USES (3) USES (4) Stone Names