Dear colleagues! In the previous article, we discussed the differences in the application of light beige Jurassic marble for facades and interior decoration. In this article, we would like to focus on another representative of Jurassic stone, namely Jurassic limestone in gray color. This type of Jurassic marble is very popular due to its noble grayish-blue hue. Of course, it also contains remains of ancient inhabitants of the Jurassic period, which makes it a unique material for finishing.
There are several commercial names for this type of Jurassic limestone on the market: Jura Grey, Jura PolarBlau, Jura Blue (Jurassic limestone Jura Blue), Jura Grey Blue, Grabler, etc.
🔍The material is very popular for private interiors, upscale restaurants, hotels, office centers, and fitness clubs.
🔍However, the situation is quite different when it comes to using this type of Jurassic stone in exteriors. Let us explain in more detail.
Classic gray Jurassic marble is found in the lower layers of the so-called Upper Jurassic period – Malm, formed 135 million years BC. As a rule, these are layers 1 through 6 of the massif. Sometimes this type is found in the upper 21st layer, but its volumes are smaller and are most often not purely gray but gray-beige, for example Jura Silk Grey and Jura Melange.
The main idea we would like to convey to our highly respected audience is the areas of application of this type of Jurassic limestone.
Gray Jurassic stone from the lower (1-6) layers can generally only be used in interiors; otherwise, rusty streaks may appear over time. However, some quarries have layers, such as No. 2, where the material performs well when used in external cladding. Unfortunately, not all quarries can offer this material in a pure gray color, so a certain selection is required.
🔍Separately, we would like to note the fact that sometimes gray Jurassic marble is actually supplied as a mixture of gray and beige. This color combination, Jura Silk Grey, is found precisely in the lower layers 5 and 6. As long-term operation of these layers on building facades shows, they have proven to be a reliable material for external cladding.
🔍The photo shows a fragment of the facade and a selected sample of gray Jurassic stone. It is visible to the naked eye that beige tones mixed with gray inclusions predominate on the facade. This could be Jura Silk Grey, but it depends on the chosen selection, the area of the facade, and the project implementation time.
In this article, we want to tell clients and architects that gray Jurassic stone for facades is a beautiful but quite rare material. When selecting this type of stone, one should be guided not by a single A4-sized sample (in fact, this postulate applies to all types of Jurassic marble) but by a selection of slabs, where a reliable supplier will present a representative slab, as well as slab options with possible beige inclusions.