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Crystals are deep red in color and usually very well-formed. Wulfenite was approved as the official state mineral of Arizona in 2017. [5] The Los Lamentos locality in Mexico produced very thick tabular orange crystals. Another locality is Mount Peca in Slovenia. The crystals are yellow, often with well-developed pyramids and bipyramids.
Enhydro geode, found in Brazil. Enhydro agates are nodules, agates, or geodes with water trapped inside its cavity. [1] Enhydros are closely related to fluid inclusions, but are composed of chalcedony. The formation of enhydros is still an ongoing process, with specimens dated back to the Eocene Epoch. [2]
The mixture is stirred at 100 °C, and then subjected to evaporation, cooling, crystallization, and drying to obtain the orange crystals of sodium tetrachloroaurate. [4] [6] H[AuCl 4] + NaCl → Na[AuCl 4] + HCl 2 H[AuCl 4] + Na 2 CO 3 → 2 Na[AuCl 4] + H 2 O + CO 2. However, more efficient preparation methods have been discovered recently.
The thunderegg, a nodule-like geological structure, similar to a geode, that is formed within a rhyolitic lava flow, were said by the Native Americans of Warm Springs to have been created by thunder spirits that lived in the craters of Mount Hood and Mount Jefferson. [83] [84]
A geode (/ ˈ dʒ iː. oʊ d /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.
Today's NYT Connections puzzle for Friday, December 13, 2024The New York Times
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