Collyweston stone slate
The slates are quarried near the village of Collyweston in Northamptonshire , near Stamford and close to the borders of Lincolnshire and Rutland . 
<triplet> Northamptonshire <subj> Rutland <obj> shares border with <triplet> Lincolnshire <subj> Rutland <obj> shares border with <triplet> Rutland <subj> Northamptonshire <obj> shares border with <subj> Lincolnshire <obj> shares border with