CREEDITE FLUORITE Crystal Cluster Mineral Specimen Durango Mexico CLOSED MINE for Sale

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CREEDITE FLUORITE Crystal Cluster Mineral Specimen Durango Mexico CLOSED MINE For Sale

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CREEDITE FLUORITE Crystal Cluster Mineral Specimen Durango Mexico CLOSED MINE:
$47.99

This specimen weighs 23.21 grams. It measures 40 mm x 35 mm x 27 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 AMAZING Creedite crystal mineral specimen. It is really important to note that the mine where these gorgeous specimens come from was flooded and is no longer accessible. So, the price on these beauties are just going up in price more and more everyday, b/c there will never be anymore ever pulled from the earth! What is in collector's hands is all that will ever be in circulation!! It is from Mexico and the crystals on this are really nice. 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!
CreediteFrom Wikipedia, the free encyclopediaCreediteCreedite 3 photo fond.jpgCreedite, Santa Eulalia District, Municipio de Aquiles Serdán, Chihuahua, MexicoGeneralCategory Halide mineralFormula(repeating unit) Ca3Al2(SO4)(F,OH)10•2(H2O)Strunz classification 3.CG.15Crystal system MonoclinicCrystal class Prismatic (2/m)(same H-M symbol)Space group C2/cUnit cell a = 13.91 Å, b = 8.58 Å,c = 10 Å; β = 94.4°; Z = 4IdentificationColor Colorless, white, violet, orangeCrystal habit Generally appears as anhedral to subhedral in matrix; bladelike prismatic and radial, drusy to granular aggregatesCleavage Perfect on {100}Fracture ConchoidalTenacity BrittleMohs scale hardness 3.5 - 4Luster VitreousStreak WhiteDiaphaneity Transparent to translucentSpecific gravity 2.71Optical properties Biaxial (-)Refractive index nα = 1.461 nβ = 1.478 nγ = 1.485Birefringence δ = 0.0242V angle 65°Dispersion r > v strongReferences [1][2][3]Creedite is a calcium aluminium sulfate fluoro hydroxide mineral with formula: Ca3Al2SO4(F,OH)10·2(H2O). Creedite forms colorless to white to purple monoclinic prismatic crystals. It often occurs as acicular radiating sprays of fine prisms. It is translucent to transparent with indices of refraction of nα = 1.461 nβ = 1.478 nγ = 1.485. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 2.7.
Creedite was first described in 1916 from the Creede Quadrangle in Mineral County, Colorado. It is a product of intense oxidation of ore deposits.
Contents [hide]1 Occurrence2 Geologic association3 Structure4 References5 External linksOccurrence[edit]
Creedite, Qinglong Sb-Au deposit, Qinglong County, Guizhou Province, China. Overall (size: 3.4 x 3.0 x 1.3 cm)Creedite is a rare hydroxylhalide mineral. Creedite usually forms from the oxidation of fluorite ore deposits. Creedite was named after the location where it was discovered in 1916 in the Colorado Fluorspar Co. Mine at Wagon Wheel Gap, located at Creede Quadrangle, Mineral County, Colorado.[1]
It was later found in other fluorite veins near Tonopah, Nye County, Nevada; in the Grand Reef mine, Graham County, Arizona; in the Darwin district, Inyo County, California. It also occurs in the Potosi and other mines of Santa Eulalia, Chihuahua, Mexico. It is also found in La Paz, Bolivia; Pamir Mountains, Tajikistan and Dzhezkazgan, Kazakhstan.[3]
Geologic association[edit]
Creedite, Navidad Mine, Rodeo, Durango, MexicoCreedite typically occurs with low-grade metamorphic rocks on a fluorite – calcite – quartz matrix or on a sulfide-matrix with its oxidized products. Creedite most commonly found in the form of creedite – carbonate – cyanotrichite – woodwardite – spangolite – kaolinite association. The other less common creedite association is creedite – limonite – kaolinite – hemimorphite – smithsonite – hydrozincite – aurichalcite. Creedite also occurs in skarn formation which usually has association with sulfides, spangolite, brochantite, linarite, limonite, cuprite, wad and kaolinite. In general, creedite usually found as two to three millimeters radial aggregates and less commonly as a single prismatic crystals up to one millimeters long.[4]
Structure[edit]Creedite structural composition study was conducted by utilizing 1390 Philips diffractometer with Fe – filtered CoK radiation (λ=1.79021Å), 10–90° 2θ range, peak-height relative intensities. It was concluded that the creedite falls into monoclinic crystal system (2/m) that has space group of C2/c. It was also found that creedite has basal reflections of (2 0 0) and (4 0 0) that are enhanced due to preferred orientation which concur with Michael Fleischer's orientation.[5]