ARAGONITE Natural Flower Crystal Cluster Mineral Specimen MOROCCO Red Orange

Description: Click HERE to see hundreds of other amazing items for sale in my store! This specimen weighs 23.98 grams. It measures 39 mm x 30 mm x 24 mm. I offer a shipping discount for customers who combine their payments for multiple purchases into one payment! The discount is regular shipping price for the first item and just 50 cents for each additional item! To be sure you get your shipping discount just make sure all the items you want to purchase are in your cart. Auctions you win are added to your cart automatically. For any "buy it now" items or second chance offers, be sure to click the "add to cart" button, NOT the "buy it now" button. Once all of your items are in your cart just pay for them from your cart and the combined shipping discount should be applied automatically. I offer a money back guarantee on every item I sell. If you are not 100% happy with your purchase just send me a message to let me know 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 bidding, thanks so much for visiting my auction 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 classification5.AB.15Crystal systemOrthorhombicCrystal class Dipyramidal (mmm)H-M symbol: (2/m 2/m 2/m)Space groupPmcnUnit cella = 4.95, b = 7.96c = 5.74 [Å]; Z = 4IdentificationColor White, red, yellow, orange, green, purple, grey, blue and brownCrystal habitPseudohexagonal, prismatic crystals, acicular, columnar, globular, reniform, pisolitic, coralloidal, stalactitic, internally bandedTwinningPolysynthetic parallel to {100} cyclically on {110}CleavageDistinct on {010}, imperfect {110} and {011}FractureSubconchoidalTenacityBrittleMohs scale hardness3.5-4LusterVitreous, resinous on fracture surfacesStreakWhiteDiaphaneity Translucent to transparentSpecific gravity2.95Optical propertiesBiaxial (-)Refractive indexnα = 1.529 - 1.530 nβ = 1.680 - 1.682 nγ = 1.685 - 1.686Birefringenceδ = 0.1562V angle18°SolubilityDilute acidOther characteristicsFluorescence: 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] 1Occurrence2Physical properties3Uses4Gallery5See also6References7 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]

Price: 13.99 USD

Location: Tucson, Arizona

End Time: 2025-01-02T02:58:43.000Z

Shipping Cost: 5.95 USD