ARAGONITE Natural Flower Crystal Cluster Mineral Specimen MOROCCO Red Orange for Sale

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ARAGONITE Natural Flower Crystal Cluster Mineral Specimen MOROCCO Red Orange For Sale

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ARAGONITE Natural Flower Crystal Cluster Mineral Specimen MOROCCO Red Orange:
$7.99

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This specimen weighs 6.63 grams. It measures 23 mm x 20 mm x 14 mm.I offer a shipping discount for customers who combine their payments for multiple purchases into one payment!
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and I will buy back the item for your full purchase price.Hi there. I am selling this really amazing flowery Aragonite Specimen from Morocco. These are some of my favorite mineral specimens because they are so distinctive looking. There\'s really nothing else like them. If you have any questions, do not hesitate to ask me. Have fun offerding, thanks so much for visiting my sale and have a great day!
Here\'s a wikipedia article about Aragonite:
AragoniteFrom Wikipedia, the free encyclopediaAragoniteAragonite Salsigne France.jpgAragonite from Salsigne mine, Salsigne, Aude, France - Size: 30x30x20 cmGeneralCategory Carbonate mineralFormula(repeating unit) CaCO3Strunz classification 5.AB.15Crystal system OrthorhombicCrystal class Dipyramidal (mmm)H-M symbol: (2/m 2/m 2/m)Space group PmcnUnit cell a = 4.95, b = 7.96c = 5.74 [Å]; Z = 4IdentificationColor White, red, yellow, orange, green, purple, grey, blue and brownCrystal habit Pseudohexagonal, prismatic crystals, acicular, columnar, globular, reniform, pisolitic, coralloidal, stalactitic, internally bandedTwinning Polysynthetic parallel to {100} cyclically on {110}Cleavage Distinct on {010}, imperfect {110} and {011}Fracture SubconchoidalTenacity BrittleMohs scale hardness 3.5-4Luster Vitreous, resinous on fracture surfacesStreak WhiteDiaphaneity Translucent to transparentSpecific gravity 2.95Optical properties Biaxial (-)Refractive index nα = 1.529 - 1.530 nβ = 1.680 - 1.682 nγ = 1.685 - 1.686Birefringence δ = 0.1562V angle 18°Solubility Dilute acidOther characteristics Fluorescence: pale rose, yellow, white or bluish; phosphorescence: greenish or white (LW UV); yellowish (SW UV)References [1][2][3]Aragonite is a carbonate mineral, one of the two most common, naturally occurring, crystal forms of calcium carbonate, CaCO3 (the other forms being the minerals calcite and vaterite). It is formed by biological and physical processes, including precipitation from marine and freshwater environments.
Aragonite\'s crystal lattice differs from that of calcite, resulting in a different crystal shape, an orthorhombic crystal system with acicular crystal. Repeated twinning results in pseudo-hexagonal forms. Aragonite may be columnar or fibrous, occasionally in branching stalactitic forms called flos-ferri (\"flowers of iron\") from their association with the ores at the Carinthian iron mines.
Contents [hide]1 Occurrence2 Physical properties3 Uses4 Gallery5 See also6 References7 External linksOccurrence[edit]The type location for aragonite is Molina de Aragón (Guadalajara, Spain), 25 km from Aragon for which it was named in 1797.[1] An aragonite cave, the Ochtinská Aragonite Cave, is situated in Slovakia. In the US, aragonite in the form of stalactites and \"cave flowers\" (anthodite) is known from Carlsbad Caverns and other caves. Massive deposits of oolitic aragonite sand are found on the seabed in the Bahamas.
Aragonite is the high pressure polymorph of calcium carbonate. As such, it occurs in high pressure metamorphic rocks such as those formed at subduction zones.
Aragonite forms naturally in almost all mollusk shells, and as the calcareous endoskeleton of warm- and cold-water corals (Scleractinia). Several serpulids have aragonitic tubes. Because the mineral deposition in mollusk shells is strongly biologically controlled, some crystal forms are distinctively different from those of inorganic aragonite. In some mollusks, the entire shell is aragonite; in others, aragonite forms only discrete parts of a bimineralic shell (aragonite plus calcite). The nacreous layer of the aragonite fossil shells of some extinct ammonites forms an iridescent material called ammolite.
Aragonite also forms in the ocean and in caves as inorganic precipitates called marine cements and speleothems, respectively. Aragonite is not uncommon in serpentinites where high Mg in pore solutions apparently inhibits calcite growth and promotes aragonite precipitation.
Aragonite is metastable at the low pressures near the Earth\'s surface and is thus commonly replaced by calcite in fossils. Aragonite older than the Carboniferous is essentially unknown.[4] It can also be synthesized by adding a calcium chloride solution to a sodium carbonate solution at temperatures above 60 °C (140 °F) or in water-ethanol mixtures at ambient temperatures.[5]
Physical properties[edit]Aragonite is thermodynamically unstable at standard temperature and pressure, and tends to alter to calcite on scales of 107 to 108 years. The mineral vaterite, also known as μ-CaCO3, is another phase of calcium carbonate that is metastable at ambient conditions typical of Earth\'s surface, and decomposes even more readily than aragonite.[citation needed]
Uses[edit]In aquaria, aragonite is considered essential for the replication of reef conditions. Aragonite provides the materials necessary for much sea life and also keeps the pH of the water close to its natural level, to prevent the dissolution of biogenic calcium carbonate.[6]
Aragonite has been successfully tested for the removal of pollutants like zinc, cobalt and lead from contaminated wastewaters.[7]