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Seller Store callistodesigns
(42696) 99.6%,
Location: Tucson, Arizona
Ships to: US,
Item: 365213630818
Restocking Fee:No
Return shipping will be paid by:Seller
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Type:Hemimorphite
Size:29 mm x 20 mm x 9 mm
Country/Region of Manufacture:China
Weight:4.86 grams
Modified Item:No
This specimen weighs 4.86 grams. It measures 29 mm x 20 mm x 9 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 nice hemimorphite mineral specimen. It is really beautiful. This specimen is from Yunnan, China. If you have any questions, do not hesitate to ask me. Thanks so much for visiting my Ebay store and have a great day! Below is some information about hemimorphite from Wikipedia: HemimorphiteFrom Wikipedia, the free encyclopediaJump to navigationJump to searchHemimorphiteHemimorphite-132277.jpgGeneralCategory SorosilicatesFormula(repeating unit) Zn4Si2O7(OH)2·H2OStrunz classification 9.BD.10Crystal system OrthorhombicCrystal class Pyramidal (mm2)H-M symbol: (mm2)Space group Imm2Unit cell a = 8.367(5), b = 10.73c = 5.155(3) [Å]; Z = 2IdentificationColor White, blue, greenishCrystal habit Polar crystals, with different or hemimorphic ends. Also coxcomb masses, mammillary, stalactitic, or massiveTwinning Rare on {001}Cleavage Perfect on {110}, poor on {101}, {001} rareFracture Uneven to conchoidalTenacity BrittleMohs scale hardness 4.5-5Luster Vitreous, adamantine, rarely silkyStreak WhiteDiaphaneity Transparent to translucentSpecific gravity 3.516 – 3.525Optical properties Biaxial (+)Refractive index nα = 1.614 nβ = 1.617 nγ = 1.636Birefringence δ = 0.0222V angle Measured: 46°, calculated: 44°Solubility Soluble in acidReferences [1][2][3]Hemimorphite, is Zn4(Si2O7)(OH)2·H2O, a component of calamine. It is a sorosilicate mineral which has been historically mined from the upper parts of zinc and lead ores, chiefly associated with smithsonite, ZnCO3. They were assumed to be the same mineral and both were classed under the same name of calamine. In the second half of the 18th century it was discovered that these two different minerals were both present in calamine. They closely resemble each other. The silicate was the rarer of the two, and was named hemimorphite, because of the hemimorph development of its crystals. This unusual form, which is typical of only a few minerals, means that the crystals are terminated by dissimilar faces. Hemimorphite most commonly forms crystalline crusts and layers, also massive, granular, rounded and reniform aggregates, concentrically striated, or finely needle-shaped, fibrous or stalactitic, and rarely fan-shaped clusters of crystals. Some specimens show strong green fluorescence in shortwave ultraviolet light (253.7 nm) and weak light pink fluorescence in longwave UV. Occurrence Hemimorphite “spray” of crystals from Durango, Mexico (size: 2.9 x 2.1 x 2.0 cm)Hemimorphite most frequently occurs as the product of the oxidation of the upper parts of sphalerite bearing ore bodies, accompanied by other secondary minerals which form the so-called iron cap or gossan. Hemimorphite is an important ore of zinc and contains up to 54.2% of the metal, together with silicon, oxygen and hydrogen. The crystals are blunt at one end and sharp at the other. Blue vug-filling hemimorphite from Wenshan, Yunnan Province, China (size: 9.2 x 4.8 x 3.1 cm)The regions on the Belgian-German border are well known for their deposits of hemimorphite of metasomatic origin, especially Vieille Montagne in Belgium and Aachen in Germany. Other deposits are in Tarnowskie Góry area in Upper Silesia, Poland; near Phoenixville, Pennsylvania; the Missouri lead-zinc district; Elkhorn, Montana; Leadville, Colorado; and Organ Mountains, New Mexico in the United States; and in several localities in North Africa. Further hemimorphite occurrences are the Padaeng deposit near Mae Sod in western Thailand; Sardinia; Nerchinsk, Siberia; Cave del Predil, Italy; Bleiberg, Carinthia, Austria; Matlock, Derbyshire, England.
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