Equinoctial or polar sundial of slate from Wigtownshire, fashioned by John Bonar, schoolmaster in Ayr, dated 22 September 1622

Small box containing heart-shaped pieces of slate, etc., made by a patient in Rosewell Asylum

Half of a cushion macehead of veined slate, broken through the haft hole, from Fife

Ovoid macehead of flinty slate from Newmills, Balgowan, Perthshire

Trial design on a piece of dull green slate, bevelled at one edge and incised with scrolls, from Dunadd, Argyll

Trial design on piece of slate, for a penannular brooch, from the royal hillfort at Dunadd, Argyll, 575 - 850 AD

Insular lettered slate disc inscribed 'in nomine', from Dunadd, 600 - 800 AD

Oblong piece of slate perforated at one end and with scratched roughly radiating lines, from St Blane's, Bute

Part of a roofing slate incised with broad double lines, from St Blane's, Bute

Thin flake from a roofing slate incised with broad double lines, from St Blane's, Bute

Trial design on a small fragment of slate, from St Blane's, Bute

Trial design on a re-used roof slate, with an incised knotwork square, from St Blane's, Bute, 800 - 1000 AD

Insular lettered slate from St Blane's, Bute, 800 - 1000 AD

Slate graffiti showing collared dogs chasing deer, from St Blane's, Bute, 600 - 1000 AD

Rectangular piece of slate incised with a small square of interlaced work and large three limbed letter, from St Blane's, Bute, 800 - 1000 AD

Slate graffiti showing collared dogs chasing deer, from St Blane's, Bute, 600 - 1000 AD