Leinster Granite
Leinster Granite is a coarse-grained igneous rock of Silurian age (442-417 million years ago) quarried extensively in Counties Wicklow and Carlow.
It is coarse-grained and individual mineral grains are easily visible on the surface. The granite is rich in muscovite mica (silver, grey reflective, platy mineral grains seen on granite surfaces). The granite weathers by chemical and physical degradation of muscovite mica and feldspar visible as granular disintegration and scaling of the surface of the granite.
Leinster granite was predominantly used in the Republic of Ireland, particularly in the Dublin area
