Kivijärvi

Black Gabro

Gabro is generally black or dark gray with relatively minor color variations.

From the depths of the Suomenselkä hills

Kivijärvi Black is quarried from Kivijärvi in Central Finland. It has good durability and resistance to weathering, making it suitable for a variety of environmental construction projects. Kivijärvi Black has been used in recent years for guiding attention inlays at the main entrance of Nokia Arena in Tampere, as well as in cube-paving on Opening Square in Helsinki and in pavement and massive stairs in Keilaranta, Espoo.

Polished
Splitted
Sanded & polished
Bush-hammered
Flamed

The appearance of the stone is completed by surface treatment.

Granite extracted from Kalliope is worked into desired sizes, shapes and finishes. The type of finish strongly affects the depth of color of the dry stone surface. The glossy stone surface is always the most intense in color and the rough stone surface is the lightest. When the stone is wet, the color differences caused by the finish level out. Different options for surface finishing include surface grinding, chipping, flaming or splitting. The split surface, also known as the split face, is closest to the natural rock surface. In the old days, when stone processing was done manually by drilling and wedging, split face was the most common and often the only option for surface finishing. It is still a good option for certain types of structures, such as wall stones. When larger sections are to be manufactured with accuracy and cost-effectively, such as street pavements or facades, machine-sawn stone products are usually used. The sawn surface is machine finished, for example, by falming or bush-hammering. Both methods are cost-effective, and the stone’s natural color and structure are beautifully visible.

Black granite bush-hammered hat

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 black 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 black granite

Split stone surface is natural, uneven and straight-edged. Traditionally, stone is split by drilling and wedging and more and more by hydraulic presses. Thanks to advances in machinery, larger stones can now be mechanically split, while product precision has improved. Split stone is a good choice, for example, in wall stones.

Polished and honed black granite

Matta honing and polishing are different levels of grinding. During honing, the stone surface is gradually treated with a series of finer grinding stones until the desired surface smoothness is achieved. The color varies depending on the level of honing. The darkest and fullest shade is achieved with a polished surface. Polished and matte honed surfaces are used for example in facade surfaces, environmental furniture, interior stones, and memorial stones.

Kivijärvi

Black Gabro

Tampere

Nokia Arena

The main entrance surfaces, planting basins and main stairs of the arena were constructed with Kuru grey granite, along with guiding attention tiles made of Kivijärvi black granite.

Mineral composition

Values are according to the EN-12407 standard.

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