Granite varieties

Granite varieties

Like most stones, granite comes in different varieties. At first glance, they appear almost identical or very similar, but their specification is different. This in turn is determined by their origin and weather conditions that influenced the stone’s formation. The topic is very interesting so we decided it needs a dedicated article. The details can be found below.

Granite varieties:

  • Hebrew granite (also called graphic granite) – graphic intergrows that emerge in places, where pegmatites attach to the bedrock. After polishing, a graphic image appears on the surface that resembles runes or Hebrew writing. It usually occurs in magmatic rocks.
  • Karkonosze granite– can be found in Western Sudetes. It consists of several granite varieties. It is assumed, that this variety emerged in late Carboniferous. Karkonosze granite has three perpendicular splitting planes so it is easy to quarry. It is characterized by big grains of different colouration: pink, white, black, grey etc., therefore it is highly decorative. It also consists of pegmatite bodies, minerals, aplite and quartz veins. This variety is not exclusively found in the Sudetes. It is also distributed in Izera Mountains, Karkonosze Mountains, Jelenia Góra Valley and Rudawa Janowicka. It has been quarried for centuries in Silesia and Czech Republic.
  • Stregovia granite is the main rock constituting the Strzegom massif. It has got a light-grey colouration, phaneritic structure and non-directional texture. In the composition of Stregovia granite, one can find plagioclases, quartz and biotite, as well as pegmatite bodies, streaks consisting of dark materials, and quartz and aplite veins. Stregovia granite originated 280-290 millions of years ago. It has been quarried for centuries and used for building monuments, train stations, buildings, squares etc. Stregovia granite was used for erecting Sigismund’s Column in Warsaw, Stanisław Wyspiański Monument in Kraków, Władysław Jagiełło Statue, Warszawa Centralna railway station and Piłsudski Square in Warsaw.
  • Strzelin granite – the name comes from the city of Strzelin and the granite itself originates from Strzelin massif. It emerged in Westphalian (upper Carboniferous). It has got a grey colouration and comes in three varieties: small-grained granite, biotite-muscovite granite and large-grained granite. Strzelin granite has wide applications. In Poland it was used for building St. Godehard’s Rotunda in Strzelin, Palace of Culture and Science in Warsaw and for erecting the Monument to the Heroes of Warsaw.
  • Rapakiwi granite – originates from Finland but it is also found in Sweden and Russia. It is a magmatic, plutonic rock, red-brown in colour and of uneven grain texture. It consists of red or pink-red potassium feldspars with oligoclase outline. It is intersected by quartz, hornblende and biotite inclusions. Since the medieval times it has been used for erecting churches.
  • Adamellite (monzogranite) is a plutonic rock with acidic pH. It consists of biotite, quartz, plagioclases and potassium feldspars. In Poland it can be found in the Lower Silesia region.

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