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Aragonite is a carbonate mineral and one of the three most common naturally occurring crystal forms of calcium carbonate (Ca CO 3), the others being calcite and vaterite. It is formed by biological and physical processes, including precipitation from marine and freshwater environments.
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.
An aragonite sea contains aragonite and high-magnesium calcite as the primary inorganic calcium carbonate precipitates. The reason lies in the highly hydrated Mg 2+ divalent ion , the second most abundant cation in seawater after Na + , known to be a strong inhibitor of CaCO 3 crystallization at the nucleation stage.
Alchichica Lake in Puebla, Mexico has two distinct morphologic generations of stromatolites: columnar-dome like structures, rich in aragonite, forming near the shore line, dated back to 1,100 years before present (ybp) and spongy-cauliflower like thrombolytic structures that dominate the lake from top to the bottom, mainly composed of ...
An aragonite sea is the alternate seawater chemistry in which aragonite and high-magnesium calcite are the primary inorganic carbonate precipitates. The Early Paleozoic and the Middle to Late Mesozoic oceans were predominantly calcite seas, whereas the Middle Paleozoic through the Early Mesozoic and the Cenozoic (including today) are ...
They can reach 0.9 m (3 ft) in diameter and weigh over 120 kg (300 lb). Brazilian agate is found primarily as nodules and geodes in decomposed volcanic ash and basalt of Late Permian age. The largest deposits are in the Brazilian state of Rio Grande do Sul, but significant amounts can also be found throughout southeastern Brazil. Some specimens ...
The Ochtinská Aragonite Cave is one of only three aragonite caves discovered in the world so far. The cave is located at 642 meters above sea level, with an temperature between 7.2 and 7.8°C. [ 5 ] This stable microclimate, along with dissolved iron, manganese, and magnesium ion is the slowly dripping water, allows for the formation of the ...
Oolitic aragonite sand is composed of the calcium carbonate mineral, aragonite, with an egg-like shape ("oolitic" from the Ancient Greek word ᾠόν for "egg") and sand grain size. This sand type forms in tropical waters through precipitation , sedimentation , and microbial activity, and is indicative of high energy environments. [ 1 ]
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