Kuru

Redbrown Granite

Fine-grained, slightly oriented, with a general color of reddish-brown granite.

Basic bedrock of Parkkuu

Kuru’s reddish-brown granite is quarried north of Tampere, in the village of Parkkuu. It is suitable for use in all indoor and outdoor spaces and has established itself as a particularly popular building and environmental stone in Finland, Sweden, and Denmark. The stone has been quarried since the 1970s, and its color blends naturally into many different environments. Technically, the stone follows the heritage of other types of rocks in the Kuru area and is tough, resilient, and fine-grained. With Kurun’s reddish-brown granite, you can walk on pavement and streets in places such as Århus and Copenhagen in Denmark and Hämeenkadulla in downtown Tampere. It has also been used in Helsinki for facades, foundations, and massive stairs, such as in the Telakkaranta area downtown.

Polished
Splitted
SANDED & POLISHED
Bush-hammered
Flamed

The appearance of the stone is finished with surface treatment.

Granite extracted from Kalliope is shaped to desired measurements, forms, and surface treatments. The surface treatment method heavily affects the depth of dry stone color. A glossy stone surface is always the strongest in color, while a rough stone surface is the lightest. When the stone is wet, the color differences caused by the surface treatment are evened out. Options for surface treatment include surface grinding, drilling, flaming, or splitting. The closest to the natural rock surface is the split surface, also known as the split surface. In ancient times, when stone processing was done by hand by drilling and splitting, the split surface was the most common and often the only option for surface treatment. It is still a good option for certain structures, such as retaining walls. When larger units, such as paving stones or facades, need to be produced accurately and cost-effectively, machine-sawn stone products are often the solution. The sawn surface is mechanically surface-treated, for example by burning or cross-pecking. Both are cost-effective ways where the natural color and structure of the stone are beautifully visible.

Bush-hammered redbrown granite

In a bush-hammering process, the stone surface is mechanically roughened using pneumatic hammers. Larger flat surfaces are processed by an automatic machine, but certain surfaces of finished pieces are processed by hand. Bush-hammering always makes the stone a little bit lighter in color than its natural shade. The surface is evenly rough and straight. Bush-hammered surfaces are commonly used in environmental construction and facades.

Flamed reddish-brown granite

When producing flamed stone surface, the surface of the stone is heated with flames and cooled with water spray, which results in surface erosion limited to only the stone surface. The flamed stone surface is rough and straight, reproducing the color and structure of the stone more accurately than a bush-hammered surface. Flamed surfaces are commonly used in environmental construction and facades.

Splitted reddish-brown granite

Split stone surface is natural, uneven and straight. The stone is split traditionally by drilling and wedging, and increasingly by machine hydraulic presses. Due to advancements in machinery technology, larger stones can be machine split while also improving the accuracy of product measurements. Split stone is a good option for example in wall stones.

Polished and honed reddish-brown granite

Matta honing and polishing are different levels of abrasion. In honing, the stone surface is gradually refined with a series of finer grinding stones to achieve the desired surface smoothness. The color varies depending on the degree of honing. The darkest and richest tone is achieved on a polished surface. Polished and matte surface finishes are used for example in facade surfaces, outdoor furnishings, interior stones, and memorial stones.

kuru

Redbrown Granite

TAMPERE

Tampere Tramway Project

We have supplied the project with granite cobblestones for the stops, edges, and road pavements of Hämeenkadu, Niemenranta and Hervanta. Kurun gray, Kurun reddish-brown and Kurun black granite were used as materials.

Mineral composition

Values are according to EN-12407 standard

Mineral %
Plagioclase 35.1 Wt %
Kalimaasälpä 28.8 Wt %
Quartz 23.7 Wt %
Biotite 7.7 Wt %
Muskovite 2 Wt %
Other 1.5 Wt %
Epidote 1.3 Wt %
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