How To Know If Selenite Is Real
How To Know If Selenite Is Real – Review of the commercial use of sulfate minerals in the production of titanium dioxide pigments: the case of Huelva (Spain)
Jurassic-Cretaceous stratigraphic clastic zircon U-Pb data in the southeastern Verkhoyansk-Kolyma orogenic belt—correlation with active marginal rock arcs in Northeast Asia.
How To Know If Selenite Is Real
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Amazon.com: Selenite Healing Crystal
Authors: Ivan Jalil Anton Carreño-Marquez 1, Esai Castillo-Sandoval 2, Bernardo Enrique Pérez-Cazarez 3, Luis Edmundo Fuentes-Copas 2, Hilda Esperanza Esperanza Pons 2, Esperanza Menendez Mendes 4, Maria Fuenter Elena Montero Cabrera 2*
Acceptance Date: December 27, 2020 / Revision Date: February 27, 2021 / Acceptance Date: March 6, 2021 / Release Date: March 11, 2021
) is one of the most common vaporizers found in the Earth’s crust. It comes in four main forms: gypsum (CaSO
), is the main difference in the hydration state of sulfate minerals. The growth of Naica giant crystals begins with a supersaturated solution in a near-equilibrium microthermodynamic equilibrium, where gypsum can form nanocrystals up to 11-12 meters in length. Reported growth rates as low as (1.4 ± 0.2) x 10
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Nanometers per second, it takes thousands of years to form crystals with unique softness and transparency that may or may not contain solid or liquid inclusions. Conservation efforts can be traced back to other plaster structures found before Naika. Furthermore, over the past two decades, several authors have explored the unique requirements for the growth of these crystals, the characterization of their microenvironment and climatic conditions, and the prediction of degradation scenarios. We provide the latest reviews on the above topics. In addition to discoveries about the origin, in this work we also show the current state and foreseeable future of these amazing crystals.
Giant crystals are rare wonders that can only be observed in unique places around the world. Different proportions of crystals have been reported. Beryl Ken
), from Madagascar is one of the most notable examples, with a length of 18 m, a diameter of 3.5 m and an estimated mass of 380,000 kg . The largest and most impressive is probably the largest and most impressive Naica gypsum in northern Mexico, (CaSO
) and its various aquatic forms are widely distributed in the Earth’s crust and are absent only in volcanic areas. It has been used by humans since the third millennium BC . Gypsum (CaSO
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O) was first discovered at Mount Vesuvius in Italy . Both phases have been detected in certain regions of Mars by independent teams [5, 6]. Particularly large gypsum crystals can be found at the Debar mine (Macedonia), which holds gypsum crystals up to 7 meters long in caves close to the surface. They are kept at room temperature surrounded by hydrothermal pools . These terms are similar to Naica’s. There is also an ancient mine in Segobriga, Spain, where the Romans obtained large gypsum crystals. It was used as a window material before flat glass production technology became available . The El Teniente mine in Chile at Rancagua contains 4 m long autohedral gypsum crystals . Compared to Naica, these crystals are smaller but chemically similar.
Efforts to describe structural variables and the growth and precipitation of calcium sulfate date back to the early 20th century . In particular, the kinetics and growth mechanisms of calcium sulfate precipitation, such as selenite, a translucent gypsum habit, have been established in [11, 12, 13]. Anhydrite (CaSO
) is a key factor in selenite crystallization . It is dried in the presence of carbon dioxide (CO .).
) to understand their phase shift due to better solubility or carbon dioxide (CO) in water.
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The current contribution provides a comprehensive review of work to understand the evolution of the stunning Naika crystals in Chihuahua, Mexico.
Naica is a town located in the south-central region of Chihuahua in the city of Susilo (Figure 1). It is located at latitude 27°51′20″ north, longitude 105°27′00 east, and is 1330 meters above sea level. Its average temperature is 18°C and there is intermittent snowfall in winter. The annual precipitation varies between 200 and 400 mm and is considered to be rare.
Mining has been Naika’s main economic activity since the arrival of the first settlers in 1794. Some minerals found in this area are quartz, calcite and silica , while related minerals are lead, zinc and silver.
The Naika geology consists of a series of Early Cretaceous carbonate rocks, consisting mainly of limestone with minor amounts of marl and dolomite. Recrystallization caused by late metal intervention brings about the thermal reaction necessary to drive the presence of minerals (Ag-Pb-Zn), which drives the deposits in this area. The source is produced by a semi-horizontal (~20°) intrusive magma body located 1,000 m below the surface . However, it has been proposed that the concentrations of many dissolved elements in Naika water vary with fluid temperature . Three different stages of development can be distinguished, one is the temperature from 500 to 680 °C and high salinity, the second is the temperature from 240 to 490 °C and the third is the fluid reducing the temperature from 119 to 379 ° C. . These temperature differences led to the development of calcite, quartz and anhydrite deposits .
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The tectonic-geological complexity of the mountain system where the Naica mine is located has been extensively studied . The area consists of three small mountains. It forms an extended topographic dome in the northwest-southeast direction containing a series of regional fractures and faults . The mine is located at an altitude of 1,385 meters above sea level on the northern side of the Naika Mountains. For thousands of years, various stages of Naika’s development have been governed by thermal aquifers. This development leads to the formation of cracks in which selenite crystals can grow. As a result of mining activities, many caves containing selenite crystals were discovered, the first of which were discovered in the early 20th century. Among the caves, four stand out: “Cueva de las Espadas” (Sword Cave), “Cueva de los Cristales” (Crystal Cave), “Ojo de la Reina” (Queen’s Cave), “Cueva de las Villas” (Sails ) cave) . The cross section of the collector is shown in Figure 2.
There are two sources of water in Naica: meteorite intrusions and rock bodies . The region acts as a watershed, resulting in a large amount of underground precipitation . The Naica aquifer is composed of carbonate chains up to 3000 m deep , and it has been suggested that, in addition to precipitation, the aquifer may be recharged in small amounts from the nearby Conchos and San Pedro rivers .
Currently, groundwater exhibits a temperature gradient of 50 to 60°C. The deep circulation of meteor water has a pH of about 7.3 and total dissolved solids of about 300 ppm . The current composition of this water is listed in Table 1 .
Different hydrothermal compositions have been characterized, including Mg, Na, K, and Sr as well as Ca and S , suggesting that at least three distinct compositions were present during the evolution of Naica water . Hydrological behavior underlies the evolution of conditions for the subsequent growth of giant crystals, as a stable water composition is necessary for a constant precipitation rate of calcium sulfate during crystallization .
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The concentration of calcium sulfate in Naica water is close to the solubility of gypsum and anhydrite, about 0.210 g CaSO
40-50°C water per 100 grams
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