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Class
Igneous Rocks Maintenance
More Durability
Durable Compressive Strength
175.00 N/mm2 Specific Heat Capacity
0.79 kJ/Kg K Hardness
6-7 |
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Class
Sedimentary Rocks Maintenance
Less Durability
Durable Compressive Strength
Not Available Specific Heat Capacity
1.32 kJ/Kg K Hardness
1-1.5 |
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Class
Sedimentary Rocks Maintenance
More Durability
Durable Compressive Strength
95.00 N/mm2 Specific Heat Capacity
0.92 kJ/Kg K Hardness
6-7 |
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Class
Metamorphic Rocks Maintenance
More Durability
Durable Compressive Strength
125.00 N/mm2 Specific Heat Capacity
Not Available Hardness
7 |
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Class
Igneous Rocks Maintenance
Less Durability
Durable Compressive Strength
225.00 N/mm2 Specific Heat Capacity
Not Available Hardness
6-7 |
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Class
Igneous Rocks Maintenance
Less Durability
Durable Compressive Strength
225.00 N/mm2 Specific Heat Capacity
Not Available Hardness
7 |
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Rocks are also considered as a part of archaeological significance. Some rocks due to their unique and distinct properties are used for making Petroglyphs. 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. Petroglyphs are engravings or carvings into the rock panel or surface. They are created with the use of a hard hammerstone which is battered against the stone surface. At rocks.comparenature.com, you will get a complete list of rocks which are Not Used for Petroglyphs.
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 Petroglyphs. The oldest known rock art dates back from the Upper Palaeolithic period, found in Europe, Australia, Asia and Africa. There are around 64 rocks which are Not Used for Petroglyphs. Granite, Coal, Sandstone, Gneiss, etc. are the commonly known rocks which are Not Used for Petroglyphs. Checkout the above links and get to know more about rocks which are Not Used for Petroglyphs.
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