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- W2558357126 abstract "Abstract The new mineral chongite (IMA2015–039), Ca 3 Mg 2 (AsO 4 ) 2 (AsO 3 OH) 2 .4H 2 O, was found at the Torrecillas mine, Iquique Province, Chile, where it occurs as a secondary alteration phase in association with native arsenic, arsenolite, gajardoite, talmessite and torrecillasite. Chongite occurs as prismatic crystals up to ∼1 mm long grouped in tightly intergrown radial aggregates up to 2 mm in diameter. Crystals are transparent, with vitreous lustre and white streak. The Mohs hardness is ∼3½, tenacity is brittle and fracture is conchoidal. Cleavage is good on ﹛100﹜. The measured density is 3.09(2) g/cm 3 and the calculated density is 3.087 g/cm 3 . Optically, chongite is biaxial (-) with α = 1.612(1), β= 1.626(1), γ= 1.635(1) and 2V = 76.9(1)° (measured in white light). Dispersion is r < v, distinct. The optical orientation is X= b;Z^a = 27° in obtuse angle β. The mineral is slowly soluble in dilute HCl at room temperature. The empirical formula, determined from electron-microprobe analyses, is (Ca 2.90 Mg 1.93 Mn 0.14 ) Σ4.97 As 4 O 20 H 10.07 . Chongite is monoclinic, die, a = 18.5879(6), b = 9.3660(3), c = 9.9622(7) Å, β = 96.916(7)°, V= 1721.75(14) Å 3 and Z=4. The eight strongest powder X-ray diffraction lines are [d obs Å(I)(hkl)]: 8.35(29)(110), 4.644(62) (3ˉ11,020,400,2̄02), 4.396(26)(311), 3.372(62)(022,312,5̄11), 3.275(100)(420,22ˉ2,421), 3.113(57)(222), 2.384(30)(711,530,7̄12) and 1.7990(22)(9̄13,334,5̄34). The structure determination (R 1 = 1.56% for 1849 F o > 4σ F reflections) confirms that chongite is a member of the hureaulite group." @default.
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- W2558357126 date "2016-12-01" @default.
- W2558357126 modified "2023-09-23" @default.
- W2558357126 title "Chongite, Ca3Mg2(AsO4)2(AsO3OH)2·4H2O, a new arsenate member of the hureaulite group from the Torrecillas mine, Iquique Province, Chile" @default.
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- W2558357126 doi "https://doi.org/10.1180/minmag.2016.080.064" @default.
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