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Lapis lazuli is found in limestone in the Kokcha River valley of Badakhshan province in north-eastern Afghanistan, where the Sar-i Sang mine deposits have been worked for more than 6,000 years. [20] Afghanistan was the source of lapis for the ancient Persian, Egyptian and Mesopotamian civilizations, as well as the later Greeks and Romans.
Travertine continued to be the most used material. Anorthosite gneiss was replaced by a wide range of local and foreign stones, for example steatite, lapis lazuli, obsidian and carnelian. The intact tomb of Sithathoriunet held stone vessels in two separate boxes. They contained a sacred oil set of travertine, cylindrical jars and several gilded ...
Brine mining is the extraction of useful materials (chemical elements or compounds) which are naturally dissolved in brine.The brine may be seawater, other surface water, groundwater, or hyper-saline solutions from several industries (e.g., textile industries). [1]
In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. [1] The name is from the Spanish word placer , meaning " alluvial sand".
On Earth, beach deposits of this size would have needed millions of years to form, the researchers said, suggesting that on Mars there was a large and long-lived body of water with wave action ...
Lacustrine deposits have gained more attention recently due to containing valuable source rocks of oil, coal, and uranium. Lacustrine deposits generally provide productive mining conditions but can prove challenging when underground mines are attempted due to the poor shear strength of clays and silts as well as the amount of moisture often locked in the layers due to a low permeability ...
And the other, in the journal Nature, found that the samples contained minerals formed when brine - salty water - evaporated on Bennu's parent body, the type of wet environment where prebiotic ...
Why tourists are being told to wipe their shoes before visiting the ‘world’s clearest lake’