Muschelkalk Blaubank (also Blaubank, Kirchheimer Blaubank or Kirchheim Blaubank) is a classic German Triassic building limestone from the quarry district around Kirchheim in Lower Franconia (Bavaria), with a characteristically blue-grey to warm grey ground tone and clearly visible fossil content from shell fragments. One of the most widely built German building limestones ('very frequently used in Germany') — employed for floors, wall cladding, stairs, façade cladding, external paving, plinth details and prestige German architecture in the building stone tradition for centuries.
Muschelkalk Blaubank is one of the most tradition-rich and most widely built German building limestones of all. The quarries around the Lower Franconian town of Kirchheim in Bavaria have supplied natural building stone continuously for centuries to the German construction industry — from medieval sacred architecture through the prestige buildings of the Gründerzeit and the buildings of the Weimar Republic to contemporary residential and commercial architecture. The designation 'Blaubank' refers to a specific bed in the geological profile of the Muschelkalk formation, in which the stone shows its characteristic blue-grey to warm grey colouring with clearly visible fossil content — a stratigraphic subdivision that has made the German building limestones one of the most precisely classified natural building stone families in Europe.
Geologically it is a Triassic bioclastic limestone of the upper Muschelkalk stage (Middle Triassic, roughly 240 to 235 million years old). The Muschelkalk formation arose in a shallow, warm shelf sea that covered central Europe during the Triassic and in which shells and skeletal fragments of bivalves, brachiopods, crinoids, bryozoans and other marine organisms were deposited in thick carbonate beds. The intense fossil density is the visually most striking feature of the stone — on closer inspection one can make out countless cross-sections of shells emerging from the dense carbonate cement, giving the surface a characterful, vividly historic feel. The DNSA classification under entry #240 (INSK 62.1) lists the trade names BLAUBANK, MUSCHELKALK BLAUBANK and KIRCHHEIMER BLAUBANK as synonyms. The location variant KIRCHHEIM BLAUBANK (DNSA #1446, quarried at the Geierglocke/Kirchheim quarry) belongs to the same geological bed.
Visually, Muschelkalk Blaubank is defined by a quietly elegant, characteristically German building stone feel. The ground tone moves within the cool to warm grey spectrum with a distinct blue-grey undertone, which has given the stone its trade name 'Blaubank'. Interspersed are clearly visible white to light beige shell fragments which, depending on the direction of cut, appear as round, oval or lens-shaped cross-sections — these fossil structures give every slab an unmistakable figuring with the character of a one-off. The surface finishes currently held in stock are listed in the »Finishes« block further down. The stone has been so well known and established in German construction for centuries that it may be regarded as a synonym for 'German building limestone'.
Technically, Muschelkalk Blaubank is among the highest-quality German construction limestones: bulk density around 2690 kg/m³, compressive strength of 113 MPa, flexural strength between 8 and 12 MPa, wear resistance 22.9 cm³/50 cm² and a remarkably low water absorption of only 0.3 %. These values qualify it for intensive interior and exterior applications, including heavily used floors, stairs with high foot traffic and façade cladding. Frost resistance is confirmed by centuries of German building experience — many historic buildings in Bavaria and throughout Germany are clad in this stone and remain in impeccable condition today. The surface finishes currently held in stock are listed in the »Finishes« block further down.
In interior fit-out, Muschelkalk Blaubank is a proven choice for classic German, prestige-historic and contemporary elegant architecture. Classic applications are floors in entrance halls and living spaces, wall cladding, stair treads, skirtings, window sills, parapets and bathrooms. The cool grey tonality with its characteristic shell fossils harmonises with dark timber fittings in oak, hickory or walnut, with brass and bronze accents, with clear white and with muted earth tones. Outdoors the stone is a historic classic for façade cladding, plinth panels, stairs, paving and fountain surrounds — the low water absorption and the demonstrably high frost resistance make it a choice proven over centuries. Muschelkalk Blaubank has also been established for generations in memorial work and for historic restoration projects.
In stock
Current availability from our warehouse.
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Technical data
Guide values for the stone type, taken from manufacturer and test reports. Natural stone is a natural product — individual batches and slabs can differ. For critical applications, request slab-specific test data.
Muschelkalk Blaubank is available in a range of finishes. The finish affects appearance, feel and the care it needs.
Satiniert
Die Oberfläche wird gebürstet — weichere Minerale werden gezielt entfernt, es entsteht eine subtile Tiefe und mattes Erscheinungsbild. Besonders geaderte Kalksteine erhalten so eine charaktervolle Optik und Haptik. Die mattere Veredelung kaschiert kleine Ätzungen besser als poliert und ist alltagstauglicher für stark beanspruchte Innenflächen.
Care & fabrication
As a limestone, Muschelkalk Blaubank is acid-sensitive, but thanks to its low water absorption of 0.3 % and compressive strength of 113 MPa it is technically an exceptionally robust representative of its material class, with centuries of proven maintenance experience in the German building tradition. Indoors, use exclusively warm water with a pH-neutral stone cleaning agent for daily cleaning — acidic household cleaners, vinegar, citric acid descalers or other acidic substances cause dull etched patches that can only be reversed by professional re-polishing. Take up spilled acidic liquids promptly with clear water. Professional sealing after installation and every 2 to 3 years thereafter is recommended indoors and obligatory outdoors — it reduces water absorption further, protects against freeze-thaw damage and moderates the take-up of pigments (red wine, coffee, olive oil). Outdoors, avoiding de-icing salt in winter is important — chloride-free de-icing agents are the gentler alternative. Where precipitation is acidic in urban locations, a light patina can form over long periods, which in many historic buildings is accepted as a welcome effect of ageing. The surface finishes currently held in stock are listed in the »Finishes« block further down.
Frequently asked questions
What does the designation 'Blaubank' mean?
'Blaubank' is a German stonemasonry and geological term denoting a specific bed (stratigraphic layer) in the geological profile of the Muschelkalk formation, in which the stone shows its characteristic blue-grey to warm grey colouring. The subdivision of German building limestones into named beds (for example Blaubank, Steinbank, Werkbank) is a tradition-rich classification of German stonemasonry and has made the building limestones one of the most precisely defined natural building stone families in Europe.
What is Muschelkalk?
Muschelkalk is a Triassic bioclastic limestone of the central European Middle Triassic (roughly 240 to 235 million years old), formed by the deposition of shells and skeletal fragments of marine organisms in a shallow, warm shelf sea. The designation 'Muschelkalk' refers to the intense fossil density with countless shells, which in polished section appear as characteristic round, oval and lens-shaped cross-sections. The Muschelkalk formation is widespread in Germany and has supplied important natural building stone for centuries.
Where does Muschelkalk Blaubank come from?
Muschelkalk Blaubank is quarried in the district around the town of Kirchheim in Lower Franconia (Bavaria) — a tradition-rich German natural building stone region that has supplied natural building stone continuously for centuries to the German construction industry. The location variant Kirchheim Blaubank comes from the Geierglocke quarry near Kirchheim and belongs to the same geological bed as the general Muschelkalk Blaubank.
Is Muschelkalk Blaubank suitable for external applications?
Outstandingly so. The low water absorption of 0.3 % and the high compressive strength of 113 MPa qualify Muschelkalk Blaubank for demanding external applications in central European climate conditions. It is used for façade cladding, plinth panels, stairs, paving, fountain surrounds and parapets. Centuries of proven service on German historic buildings testify impressively to its long-term weather stability. In openly weathered external areas, satin-honed or sandblasted surfaces are preferable to polished ones, since a high gloss is not stable over the long term on horizontal external surfaces.
Is Muschelkalk Blaubank suitable for kitchen worktops?
With reservations. The acid sensitivity to lemon juice, vinegar, wine and cola leads on contact to dull etched patches — a property typical of limestone that cannot be prevented by sealing. The low water absorption of 0.3 % is a clear advantage over softer limestones. Anyone who accepts the characterfully ageing building stone aspect with its lively formation of patina as a design value gets an elegantly classic work surface; anyone wanting a mark-free surface should prefer acid-insensitive hard rocks such as granite or quartzite.
Which applications are classic for Muschelkalk Blaubank?
Muschelkalk Blaubank is classically established for floors in entrance halls and living spaces, wall cladding, stair treads, skirtings, window sills, bathrooms, parapets and fountain surrounds. Outdoors, façade cladding, plinth panels, stairs, paving and memorial applications have been used with proven success in the German building tradition for centuries. On account of its historic status, the stone is a central component of German restoration and heritage conservation projects and is also used for new buildings intended to fit into German historic building ensembles.
