Iceland spar, large cleavage rhomb of the trigonal crystal calcite, from which Nicol prisms are made

Calcite - pale orange-pink to colourless crystals - associated with hematite on matrix - from Waygate Shaft, Straitsteps Mine, Wanlockhead, Dumfriesshire

Calcite - chalk white crystal aggregates pseudomorph after witherite - from Liverick Vein from a cross cut between High Raise and Trebar Veins, Haggs Mine, Allenheads, Northumberland, England

Calcite vein - a small polished slab - with large, interlocking crystals in black, granular host rock - locality unknown

Calcite - a small polished slab - colourless translucent, with single narrow orange band - locality unknown

Calcite - large white dog tooth spar crystals - on a white granular base - from the New Glencrieff vein, Wanlockhead Mine, Wanlockhead, Dumfriesshire

Calcite - large white dog tooth spar crystals - associated with white well-formed quartz crystals - from the New Glencrieff vein, Wanlockhead Mine, Wanlockhead, Dumfriesshire

Calcite - a group of pink and grey translucent crystals showing parallel growth - from New Glencrieff Mine, Wanlockhead, Dumfriesshire

Calcite - a group of white to clear double terminated crystals on black sphalerite - from New Glencrieff Vein, Wanlockhead Mine, Dumfriesshire

Calcite - a group of colourless crystals, the tips of some are grey with inclusions and several tiny pyrite crystals scattered over - from New Glencrieff Mine, Wanlockhead, Dumfriesshire

Calcite - two white to pale grey double terminated crystals - one 4cm, the other 2.5cm - on dolomite crystals on quartz matrix - from New Glencrieff Mine, Wanlockhead, Dumfriesshire

Calcite, pseudomorphous after an unknown cubic mineral possibly fluorite associated with xonotlite? - from Binhill Quarry, Cairnie, Huntly, Aberdeenshire

Calcite pseudomorphous after an unknown cubic mineral possibly fluorite - from Binhill Quarry, Cairnie, Huntly, Aberdeenshire

Calcite, white crystalline mineral pseudomorphous after an unknown cubic mineral (possibly fluorite) - from Binhill Quarry, Cairnie, Huntly, Aberdeenshire.

Calcite - translucent pale brown to white mainly hexagonal lamellar crystals, form a o - from Strontian, Argyll

Calcite - a group of translucent, milky prismatic crystals on matrix - some faces of one crystal have been annotated to show forms ξ, γ, m, ω, and v after Dana (6th edition) - from Strontian, Argyll