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Class
Metamorphic Rocks Maintenance
Less Durability
Durable Compressive Strength
30.00 N/mm2 Specific Heat Capacity
0.76 kJ/Kg K Hardness
3-4 |
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Class
Igneous Rocks Maintenance
Less Durability
Durable Compressive Strength
0.15 N/mm2 Specific Heat Capacity
0.92 kJ/Kg K Hardness
5-5.5 |
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Class
Metamorphic Rocks Maintenance
More Durability
Durable Compressive Strength
115.00 N/mm2 Specific Heat Capacity
0.88 kJ/Kg K Hardness
3-4 |
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Class
Sedimentary Rocks Maintenance
More Durability
Durable Compressive Strength
115.00 N/mm2 Specific Heat Capacity
0.91 kJ/Kg K Hardness
3-4 |
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Class
Igneous Rocks Maintenance
More Durability
Durable Compressive Strength
37.40 N/mm2 Specific Heat Capacity
0.84 kJ/Kg K Hardness
6 |
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Class
Sedimentary Rocks Maintenance
Less Durability
Durable Compressive Strength
140.00 N/mm2 Specific Heat Capacity
0.92 kJ/Kg K Hardness
3.5-4 |
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Rocks are also considered of as a part of archaeological significance. Some rocks due to their unique and distinct properties are used for making Pictographs. In archaeology, rock art are human-made markings which are placed on natural stone. Rock art is found in many culturally diverse regions of the world. Rock art are described as "rock carvings", "rock drawings", "rock paintings", "rock inscriptions", "rock pictures", "rock engravings", etc. Rock art generally includes Pictographs, Petroglyphs and Earth Figurines. Pictographs are paintings or drawings that have been placed or engraved onto the rock surface. Such artworks have typically been made with mineral earths and other natural compounds which are found across much of the world. The colors mainly used are red, black and white. At rocks.comparenature.com, you will get a complete list of rocks which are Used for Pictographs.
Study of archaeological significance of rocks gives information about long past. The rocks used for rock art are generally soft rocks or medium hardness rocks. Hard rocks cannot be used in making pictographs. The oldest known rock art dates back from the Upper Palaeolithic period, found in Europe, Australia, Asia and Africa. There are around 85 rocks which are Used for Pictographs. Slate, Obsidian, Marble, Limestone, etc. are the commonly known rocks which are Used for Pictographs. Checkout the above links and get to know more about rocks which are Used for Pictographs.
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