Kinawa Classico

Building design
The typical color of the Kinawa Classico migmatite is gray with reddish-purple secondary colors. Photo: Abraxas Stone Experts / Giessen
The typical color of the Kinawa Classico migmatite is gray with reddish-purple secondary colors. Photo: Abraxas Stone Experts / Giessen

Petrology, also known as the study of rocks, is the science of the formation, properties, and uses of rocks. In our online series, we introduce different types of stone and their occurrences: This time, Kinawa Classico.

The typical color of Kinawa Classico migmatite is gray with reddish-purple secondary colors. Photo: Abraxas Stone Experts / Giessen

Kinawa Classico is a migmatite. In addition to migmatites, there are also magmatites. Although they differ in spelling by only one letter, they should not be confused. Magmatites are formed from molten magma. Their formation can occur deep within the Earth (plutonic rocks), as is the case with granites, gabbros, etc., or the magma may have broken through the Earth’s crust (volcanic rocks), as is the case with rhyolites (often colloquially referred to as porphyry) or basalts.

Magmatic rocks belong to the group of igneous rocks. The formation of migmatites involved highly complex geological processes that took place under high pressures and temperatures deep within the Earth. The German term “Mischgneise” (mixed gneiss) most vividly describes such rocks. This term indicates that these rocks consist of different components, namely a paleosome (the older rock component) and the intruded neosome (the newer rock component).

In terms of their technical properties, migmatites and magmatites are very similar. Both possess good to very good technical properties and generally exhibit high resistance to mechanical and chemical attack. What distinguishes migmatites from most magmatites is their visual appearance. Migmatites exhibit very lively patterns with varied textures. When considering migmatites as a whole, it can be said that Kinawa Classico falls within the moderate range in terms of its design prominence and naturally occurring variations.

Read more in STEIN 3/2021.

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Light and shadow in Cologne

Building design

L.-Fritz-Gruber-Platz is only about 400 meters away from Cologne Cathedral as the crow flies. For its design, the Düsseldorf-based firm scape Landschaftsarchitekten took up the theme of photography. The result is a play of light and shadow.

L. Fritz Gruber Square is located just 400 meters from Cologne Cathedral as the crow flies, right next to the Kolumba Art Museum of the Archdiocese of Cologne, which was built in 2007 according to plans by Peter Zumthor. The square is named after the photographic historian and journalist Leo Fritz Gruber. From 1945, he worked as a photographer for the British Army of the Rhine. This passion never left him. The Düsseldorf-based firm scape Landschaftsarchitekten therefore took up the theme of photography for the design of the square. A play of light and shadow creates a two-dimensional image of the large maple trees on the square. The square is bordered by listed facades from the 1920s and 1960s. Typical local basalt cobblestones surround a rectangular area of light-colored concrete slabs with an aspect ratio of 6:9 (small picture format), which is framed by three white cuboid benches.

Shadow plays are created on this projection surface, which is illuminated at night by a luminaire hanging above the square in the shape of a hollow sphere. Objects that cross its beam of light create sharply defined shadows on the paving. The functional principle is similar to that of a projector: a hollow body with a matt black inner surface and a point-shaped light source, the opening of which is dimensioned at the bottom so that the focal point beams precisely trace the surface of the square.

L.-Fritz-Gruber-Platz, Cologne

Client: City of Cologne – Civil Engineering Department
Open space: scape Landschaftsarchitekten, Düsseldorf
Project management: Hiltrud M. Lintel, Rainer Sachse
Collaboration: Jan Heimann, Judith Pfahler, Markus Hilgers, Bernd Nengel
Competition: 2007, 1st prize
Completion: September 2012
Area: 2,200 square meters
Costs: 570,000 euros

A stroke of art-historical luck

Building design

The Gothic sacristies of the parish church of St. Quirinus in Tegernsee are to be restored. Many eras have left their mark on St. Quirinus, which was the monastery church of the most important Benedictine abbey in Upper Bavaria until 1803.

The Gothic sacristies of the parish church of St. Quirinus in Tegernsee are to be restored. Many eras have left their mark on St. Quirinus, which was the monastery church of the most important Benedictine abbey in Upper Bavaria until 1803.

The sacristy used today dates from the Baroque period, but the two Gothic sacristies with their vaults and rare gray-on-gray painting are a stroke of art-historical luck. These are now used as storerooms, albeit for valuable items from the monastery or handicraft objects such as candlesticks or figurines.

The approval of the preliminary investigation for the restoration means that the sacristies will now be cleared out so that they can be made accessible to the public at some point in the future. Church historian Roland Götz has taken a closer look at the sacristies and knows that their preservation is a stroke of luck. However, fire protection still needs to be clarified, as there are no escape routes. As the church is under the same roof as the Bräustüberl, the castle distillery, the grammar school and the brewery, all those responsible and the owners must first come to an agreement. How much all the measures would cost is now to be found out in advance.