Emmonsite

(repeating unit)Fe2(TeO3)3·2(H2O)IMA symbolEms[1]Strunz classification4.JM.10Crystal systemTriclinicCrystal classPinacoidal (1)
(same H-M symbol)Space groupP1Unit cella = 7.90, b = 8.00
c = 7.62 [Å]; α = 96.73°
β = 95°, γ = 84.47°; Z = 2IdentificationColorYellowish greenCrystal habitThin to hairlike crystals, occurring in rosettes and sprays; also fibrous globular aggregates and crustsTwinningNotedCleavagePerfect on {010}; good on {100} and {001}Mohs scale hardness5LusterVitreousDiaphaneityOpaque to translucentSpecific gravity4.52–4.55Optical propertiesBiaxial (-)Refractive indexnα = 1.962 nβ = 2.090 nγ = 2.100 - 2.120Birefringenceδ = 0.138 - 0.158PleochroismWeak2V angleMeasured: 23°References[2][3][4]

Emmonsite, also known as durdenite, is an iron tellurite mineral with the formula: Fe2(TeO3)3·2(H2O).[2] Emmonsite forms triclinic crystals.[2] It is of a yellowish-green color, with a vitreous luster,[2] and a hardness of 5 on the Moh scale.[3]

Emmonsite crystal spray from the Moctezuma Mine (3 mm image width)

Emmonsite was first described in 1885 for an occurrence in the Tombstone District, Cochise County, Arizona. It was named for the American geologist, Samuel Franklin Emmons, (1841–1911), of the United States Geological Survey.[2][3]

Emmonsite is found, often with quartz or cerussite in the Tombstone, Arizona area.[3] It is also associated with native tellurium, tellurite, native gold, pyrite, rodalquilarite, mackayite, sonoraite, cuzticite and eztlite.[2]

References

Wikimedia Commons has media related to Emmonsite.
  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b c d e f Mineral Data Publishing, Handbook of Mineralogy pdf
  3. ^ a b c d Emmonsite on Mindat website
  4. ^ Emmonsite data on Webmineral.com
  • Frost, Ray L. and Dickfos, Marilla J. and Keeffe, Eloise C. (2008) "Raman spectroscopic study of the tellurite minerals: emmonsite Fe23+Te34+O9.2H2O and zemannite Mg0.5[Zn2+Fe3+(TeO3)3]4.5H2O." Journal of Raman Spectroscopy, 39(12). pp. 1784–1788. Found at Queensland University of Technology website; Accessed September 15, 2010.
  • W. F. Hillebrand, "Emmonsite (?) from a new locality," American Journal of Science, Series 4 Vol. 18, December 1904, P.433-434; doi:10.2475/ajs.s4-18.108.433. Found at AJS Online; Accessed September 15, 2010.
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Selenites, selenates, tellurites, and tellurates
Selenites 28.1
Ahlfeldite Chalcomenite Clinochalcomenite Cobaltomenite Demesmaekerite Derriksite Francisite Guilleminite Haynesite Mandarinoite Marthozite Molybdomenite Sofiite
Selenates 28.2
Olsacherite Schmiederite
Tellurites 28.3
Balyakinite Blakeite Cesbronite Chekhovichite Choloalite Cliffordite Denningite Emmonsite Eztlite Fairbankite Graemite Keystoneite Kinichilite Mackayite Moctezumite Mroseite Plumbotellurite Poughite Quetzalcoatlite Rajite Rodalquilarite Schmitterite Smirnite Sonoraite Spiroffite Teineite Winstanleyite Zemannite
Tellurates 28.4
Carlfriesite Cheremnykhite Cuzticite Dugganite Girdite Khinite Khinite-3T Kuksite Kuranakhite Montanite Oboyerite Schieffelinite Tlalocite Tlapallite Xocomecatlite Yafsoanite Yecoraite

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