POLISHED KUNZITE SPODUMENE Specimen Crystal Mineral Gemstone AFGHANISTAN

Description: This specimen weighs 13.43 grams. It measures 37 mm x 16 mm x 10 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 beautiful, high grade, polished kunzite crystal cluster mineral specimen. It is from Nuristan Province, Afghanistan. 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!The following is a wikipedia entry about kunzite: SpodumeneFrom Wikipedia, the free encyclopediaJump to navigationJump to search"Kunzite" redirects here. For the Sailor Moon character, see Dark Kingdom § Kunzite.SpodumeneGeneralCategoryInosilicateFormula(repeating unit)lithium aluminium silicate, LiAl(SiO3)2Crystal systemMonoclinicCrystal classPrismatic (2/m) (same H-M symbol)Space group C2/cUnit cella = 9.46 Å, b = 8.39 Å c = 5.22 Å β = 110.17°; Z = 4IdentificationColorHighly variable: white, colorless, gray, pink, lilac, violet, yellow and green, may be bicolored; emerald green - hiddenite; lilac - kunzite; yellow - triphaneCrystal habitprismatic, generally flattened and elongated, striated parallel to {100}, commonly massiveTwinningCommon on {100}CleavagePerfect prismatic, two directions {110} ∧ {110} at 87°FractureUneven to subconchoidalTenacityBrittleMohs scale hardness6.5–7LusterVitreous, pearly on cleavageStreakwhiteSpecific gravity3.03–3.23Optical propertiesBiaxial (+)Refractive indexnα = 1.648–1.661 nβ = 1.655–1.670 nγ = 1.662–1.679Birefringence δ = 0.014–0.018PleochroismStrong in kunzite: α-purple, γ-colorless; hiddenite: α-green, γ-colorless2V angle54° to 69°Fusibility3.5SolubilityinsolubleOther characteristicsTenebrescence, chatoyancy, kunzite often fluorescent under UV[citation needed]References[1][2][3][4]Spodumene is a pyroxene mineral consisting of lithium aluminium inosilicate, LiAl(SiO3)2, and is a source of lithium. It occurs as colorless to yellowish, purplish, or lilac kunzite (see below), yellowish-green or emerald-green hiddenite, prismatic crystals, often of great size. Single crystals of 14.3 m (47 ft) in size are reported from the Black Hills of South Dakota, United States.[5][6] The normal low-temperature form α-spodumene is in the monoclinic system whereas the high-temperature β-spodumene crystallizes in the tetragonal system. The normal α-spodumene converts to β-spodumene at temperatures above 900 °C.[4] Crystals are typically heavily striated parallel to the principal axis. Crystal faces are often etched and pitted with triangular markings. Contents1Discovery and occurrence2Economic importance3Gemstone varieties3.1Hiddenite3.2Kunzite4See also5Notes6References7External linksDiscovery and occurrenceSpodumene was first described in 1800 for an occurrence in the type locality in Utö, Södermanland, Sweden. It was discovered by Brazilian naturalist Jose Bonifacio de Andrada e Silva. The name is derived from the Greek spodumenos (σποδυμενος), meaning "burnt to ashes," owing to the opaque, ash-grey appearance of material refined for use in industry.[1] Spodumene occurs in lithium-rich granite pegmatites and aplites. Associated minerals include: quartz, albite, petalite, eucryptite, lepidolite and beryl.[2] Transparent material has long been used as a gemstone with varieties kunzite and hiddenite noted for their strong pleochroism. Source localities include Afghanistan, Australia, Brazil, Madagascar, Pakistan, Québec in Canada and North Carolina, California in the US. Economic importanceSpodumene is an important source of lithium for use in ceramics, mobile phone and automotive batteries, medicine, Pyroceram and as a fluxing agent. Lithium is extracted from spodumene by fusing in acid. World production of lithium via spodumene is around 80,000 metric tonnes per annum, primarily from the Greenbushes pegmatite of Western Australia and from some Chinese and Chilean sources. The Talison mine in Greenbushes, Western Australia is reported to be the largest and to have the highest grade of ore at four percent Li2O.[7] Terence Bell thinks that spodumene will become a less important source of lithium due to the emergence of alkaline brine lake sources in Chile, China and Argentina, which produce lithium chloride directly.[8] Lithium chloride is converted to lithium carbonate and lithium hydroxide by reaction with sodium carbonate and calcium hydroxide respectively. However, pegmatite-based projects benefit from being quicker to move into production than brines, which can take 18 months to 3 years, depending on evaporation rates. With pegmatites, once a mill is built, the production of lithium carbonate takes only a matter of days. Another key advantage that spodumene has over its more popular brine rivals is the purity of the lithium carbonate it can produce. While all product used by the battery industry has to be at least 99.5% lithium carbonate, the makeup of the remaining 0.5% is important; higher amounts of iron, magnesium or other deleterious materials make for a less attractive product. Gemstone varietiesHiddeniteHiddenite is a pale emerald green gem variety first reported from Alexander County, North Carolina, US. It was named in honor of William Earl Hidden (16 February 1853 - 12 June 1918), mining engineer, mineral collector, and mineral dealer. This emerald green variety of spodumene is colored by chromium, just like emeralds. Not all green spodumene is colored with chromium, which tend to have a lighter color, and therefore are not true hiddenite.[clarification needed] KunziteKunzite is a pink to lilac colored gemstone, a variety of spodumene with the color coming from minor to trace amounts of manganese. Some (but not all) kunzite used for gemstones has been heated to enhance its color. It is also frequently irradiated to enhance the color. Kunzite was discovered in 1902, and was named after George Frederick Kunz, Tiffany & Co's chief jeweler at the time, and a noted mineralogist. It has been found in Brazil, US, Canada, CIS, Mexico, Sweden, Western Australia, Afghanistan and Pakistan. One notable example of kunzite used in jewellery is in the Russian Palmette tiara and necklace worn by the Duchess of Gloucester.[9]

Price: 47.99 USD

Location: Tucson, Arizona

End Time: 2025-01-12T01:27:57.000Z

Shipping Cost: 5.95 USD