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Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc.
Carrara marble has been used since the time of Ancient Rome, when it was called marmor lunense, or "Luni marble". [2] [3]In the Middle Ages, most of the quarries were owned by the Marquis Malaspina who in turn rented them to families of Carrara masters who managed both the extraction and transport of the precious material.
Andradite is a calcium-iron garnet, Ca 3 Fe 2 (SiO 4) 3, is of variable composition and may be red, yellow, brown, green or black. [3] The recognized varieties are demantoid (green), melanite (black), [ 3 ] and topazolite (yellow or green).
It generally comes in black, but can also be velvet-black, blackish brown, grey or greenish. Oltu stone's most interesting characteristic is its softness when excavated. It only begins to harden when exposed to the air. For this reason, it can be carved very easily. [2] It attracts, by way of static electricity, light substances like dust when ...
From wildfires and intense heat, to devastating hurricanes and tornadoes, weather dominated the news in 2024.And for every beautiful image of the aurora borealis or a stunning rainbow, more images ...
Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]
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