Aberdeen Granite

Aberdeen is called the Granite City because it was built almost entirely from the silver-grey granite quarried beneath and around it. Two centuries of intensive working gave the whole city one colour and one texture, from the spires of Marischal College to the cobbled streets of the centre. Few cities are made of a single stone this completely.

What Is Aberdeen Granite?

Aberdeen Granite is an igneous rock (specifically a biotite granite) formed approximately 400-470 million years ago during the Caledonian orogeny, when the collision of ancient continental plates generated immense heat and pressure that melted and recrystallised the deep crustal rocks of north-east Scotland. The resulting granite cooled slowly underground, allowing large, well-formed crystals of quartz, feldspar, and mica to develop.

The principal quarrying areas are in Aberdeenshire, particularly around Rubislaw (historically the city's primary source), Kemnay, Peterhead, and Corrennie. Each source produces granite with subtly different characteristics. Rubislaw is the archetypal grey Aberdeen granite; Peterhead granite is distinctly pink-red; Kemnay is lighter and more silver-white; Corrennie has a particularly coarse crystal structure. When people refer to "Aberdeen Granite" they typically mean the grey varieties, Rubislaw, Kemnay, and similar.

Colour and Character

The signature quality of Aberdeen Granite is its characteristic shimmer. The large feldspar and quartz crystals, combined with bright biotite mica, reflect light differently depending on angle and illumination, giving the stone a lively, almost metallic quality. In bright sunshine, Aberdeen Granite buildings seem almost to sparkle; in overcast Scottish light, they present a cool, dignified grey.

The base colour of grey Aberdeen granite runs from silver-white (Kemnay) through medium grey (Rubislaw type) to blue-grey (some Corrennie beds). The crystal size is typically medium to coarse, giving the stone a bold visual texture at close range that reads as a single even grey across a whole facade.

Unlike Bath Stone or limestone which mellow and warm with age, Aberdeen Granite retains its cool character through centuries of weathering. Historic Aberdeen Granite buildings show little visual change from their original appearance, which is part of the material's appeal for civic and institutional architecture.

Applications

Monumental and memorial work: Aberdeen Granite's impermeability, resistance to acid rain and atmospheric pollution, and hardness make it the traditional choice for headstones, war memorials, public sculpture, and commemorative architecture. The stone holds a polish indefinitely, which is why nineteenth-century Aberdeen headstones are still legible.

Heritage and civic architecture: The historic buildings of Aberdeen, Edinburgh, Glasgow, and many other Scottish cities are built in local granite, and restoration and extension work naturally specifies matching stone. The visual continuity between original fabric and new work is essential in conservation contexts.

External paving and setts: Aberdeen Granite setts and cobbles are a feature of many Scottish town centres and historic streetscapes. Reclaimed Aberdeen Granite setts are highly sought after for restoration projects; new production setts are available from current quarrying operations.

Kerbing and street furniture: The hardness and durability of Aberdeen Granite make it a traditional choice for kerbstones, edging, and street furniture where a long service life under traffic loading is required.

Steps and copings: Aberdeen Granite's cool grey tone suits both traditional and contemporary architecture. Steps in busy public locations that would be visibly dished in softer stone after decades show no measurable wear in granite.

Kitchen worktops: Polished Aberdeen-type granite has been a popular kitchen worktop material for decades. The large crystal size shows in a polished surface, and the impermeability of granite makes it practical for food preparation (when sealed periodically).

Working with Aberdeen Granite

Aberdeen Granite is among the hardest natural stones used in construction. This hardness is its great strength (durability, impermeability, resistance to abrasion) but it also means that working the stone requires diamond tooling, specialist saws, and significant power. Hand-carving is possible for skilled masons but extremely demanding; most contemporary carved granite work uses CNC milling.

The traditional technique of hand-dressing Aberdeen Granite (using hammer and punch to create a characteristic textured surface) is still practised by specialist granite masons, and the resulting surface does not look like CNC work.

Finishes available include polished (high gloss, reveals crystal structure and colour), honed (satin matt), sawn (fine saw marks visible), bush-hammered (textured, non-slip), and punched/hand-dressed (traditional textured finish for heritage work).

Sourcing Aberdeen Granite

Several quarries in Aberdeenshire continue to produce granite, Kemnay Quarry among them. Reclaimed Aberdeen Granite (particularly setts, kerbs, and ashlar blocks from demolished buildings) is available through specialist reclamation merchants.

For heritage restoration, matching the specific source quarry of original masonry is important, as the subtle differences between Rubislaw, Kemnay, and other sources are visible to experienced eyes. Conservation architects working on Aberdeenshire buildings will typically specify granite by source rather than simply by type.

Care and Maintenance

Aberdeen Granite needs almost nothing. Its impermeability means it does not absorb water, and its hardness means surface scratching is virtually impossible in normal use. Polished surfaces can be cleaned with mild stone cleaner; external surfaces can be pressure-washed when biological growth appears.

The only area where Aberdeen Granite requires attention is the mortar joints in masonry construction. Joints should be maintained in lime mortar appropriate to the stone's age and construction, and repointed with matching material when they begin to deteriorate. Portland cement mortars are too hard and can cause stress cracking at the face of the stone.