Amphibolite
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This specimen of amphibolite comes from the mine in Ogorzelec (Rudawy Janowickie Mountains). It is over 500 million years old. It was formed out of volcanic rocks resembling basalt that were later in the earth’s crust exposed to high temperature and pressure. Those factors changed basalt into amphibolite, a rock consisting mainly of hornblende and plagioclase feldspars.
As it is rich in hornblende, it is dark green-grey. It becomes lighter in hue as it gets weathered. In numerous cracks there are cherry red-brown ferruginous blooms, probably made of epidote.
In the upper part of the rock block there is a dark green fragment, unusually smooth, slightly shiny, as if waxed. It is most likely part of the so-called tectonic mirror, a surface along which rocks moved.
Karkonosze granite
Granite is a type of intrusive rock, i.e. rock formed in the deeper parts of the earth’s crust from magma that cooled and... more »
Mica-schist
The schists are rocks that naturally split off into thin, elongated flakes or slabs. This specimen consists mainly of chlorite... more »
Basalt
Basalt is lava cooled at the surface of the earth or in volcanic pipes that existed in the Western Sudeten Mountains 20-30... more »
Melaphyre
Melaphyre is a volcanic rock similar to basalt in origin and appearance. As liquid lava, it cooled on the surface or near it... more »
Amphibolite
This specimen of amphibolite comes from the mine in Ogorzelec (Rudawy Janowickie Mountains). It is over 500 million years old.... more »
Sandstone
Sandstone is formed out of sand, when sand grains are glued together with a mineral solution. It usually happens on the bottom... more »
Dolomite marble
This type of rock was originally made from skeletons and shells of tiny sea animals that after their death accumulated on the... more »
