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This specimen weighs 30.78 grams. It measures 40 mm x 37 mm x 15 mm.
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and I will buy back the item for your full purchase price.Hi there. I am selling this botryoidal smithsonite var. cuprian mineral specimen. It is from 79 Mine, Gila County, Arizona, USA. Thanks so much for visiting my store and have a great day!
The following is information about this mineral from Carbonate mineralFormula ZnCO3IMA symbol Smt[1]Strunz classification 5.AB.05Crystal system TrigonalCrystal class Hexagonal scalenohedral (3m)H-M symbol: (3 2/m)Space group R3cUnit cell a = 4.6526(7)c = 15.0257(22) [Å]; Z = 6IdentificationColor White, grey, yellow, green to apple-green, blue, pink, purple, bluish grey, and brownCrystal habit Uncommon as crystals, typically botryoidal, reniform, spherulitic; stalactitic, earthy, compact massiveTwinning None observedCleavage Perfect on [1011]Fracture Uneven, sub-conchoidalTenacity BrittleMohs scale hardness 4.5Luster Vitreous, may be pearlyStreak WhiteDiaphaneity TranslucentSpecific gravity 4.4–4.5Optical properties Uniaxial (−)Refractive index nω = 1.842 – 1.850 nε = 1.619 – 1.623Birefringence δ = 0.223 – 0.227Ultraviolet fluorescence May fluoresce pale green or pale blue under UVReferences [2][3][4]Smithsonite, also known as zinc spar, is the mineral form of zinc carbonate (ZnCO3). Historically, smithsonite was identified with hemimorphite before it was realized that they were two different minerals. The two minerals are very similar in appearance and the term calamine has been used for both, leading to some confusion. The distinct mineral smithsonite was named in 1832 by François Sulpice Beudant in honor of English scientist James Smithson (c. 1765–1829), who first identified the mineral in 1802.[3][5]
Smithsonite is a variably colored trigonal mineral which only rarely is found in well formed crystals. The typical habit is as earthy botryoidal masses. It has a Mohs hardness of 4.5 and a specific gravity of 4.4 to 4.5.
Smithsonite occurs as a secondary mineral in the weathering or oxidation zone of zinc-bearing ore deposits. It sometimes occurs as replacement bodies in carbonate rocks and as such may constitute zinc ore. It commonly occurs in association with hemimorphite, willemite, hydrozincite, cerussite, malachite, azurite, aurichalcite and anglesite. It forms two limited solid solution series, with substitution of manganese leading to rhodochrosite, and with iron, leading to siderite.[4] A bright yellow variety is sometimes called \"turkey fat ore\". The cause of the yellow colour is due to the presence of greenockite inclusions within the smithsonite crystals.[2]
