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Emmonsite

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Iron tellurite mineral
Emmonsite
Emmonsite. Locality: San Miguel Mine, Moctezuma, Sonora, Mexico (size: 6.3 x 4.1 x 1.1 cm)
General
CategoryTellurite mineral
Formula
(repeating unit)		Fe2(TeO3)3·2(H2O)
IMA symbolEms
Strunz classification4.JM.10
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Unit cella = 7.90, b = 8.00
c = 7.62 ; α = 96.73°
β = 95°, γ = 84.47°; Z = 2
Identification
ColorYellowish green
Crystal habitThin to hairlike crystals, occurring in rosettes and sprays; also fibrous globular aggregates and crusts
TwinningNoted
CleavagePerfect on {010}; good on {100} and {001}
Mohs scale hardness5
LusterVitreous
DiaphaneityOpaque to translucent
Specific gravity4.52–4.55
Optical propertiesBiaxial (-)
Refractive indexnα = 1.962 nβ = 2.090 nγ = 2.100 - 2.120
Birefringenceδ = 0.138 - 0.158
PleochroismWeak
2V angleMeasured: 23°
References

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

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.

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

References

  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. ^ Mineral Data Publishing, Handbook of Mineralogy pdf
  3. ^ 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 Mg0.54.5H2O." 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.
Selenites, selenates, tellurites, and tellurates
Hey classification (3rd edition) 28
Selenites 28.1Ahlfeldite Chalcomenite Clinochalcomenite Cobaltomenite Demesmaekerite Derriksite Francisite Guilleminite Haynesite Mandarinoite Marthozite Molybdomenite Sofiite
Selenates 28.2Olsacherite Schmiederite
Tellurites 28.3Balyakinite 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 28.4Carlfriesite Cheremnykhite Cuzticite Dugganite Girdite Khinite Khinite-3T Kuksite Kuranakhite Montanite Oboyerite Schieffelinite Tlalocite Tlapallite Xocomecatlite Yafsoanite Yecoraite
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