...James H. Jolly; Helen L. Foster Abstract Aluminocopiapite, essentially (Mg, Fe 2+ )(Fe 3+ ,Al) 4 (SO 4 ) 6 (OH) 2 · 20 H 2 O, has been identified on the basis of chemical and optical analysis from material collected in Alaska. Although the lattice constants of several copiapites were determined...

... ). In this work, we have determined the thermodynamic properties of copiapite ( A = Fe 2+ ), ferricopiapite ( A = 2/3Fe 3+ ), magnesiocopiapite ( A = Mg), and aluminocopiapite ( A = 2/3Al). Enthalpies of formation were calculated from enthalpies of dissolution in 5 mol/dm 3 HCl (measured by acid-solution...

... and decomposition. The natural occurrences are comparable with the process of paragenesis from the evaporation of Río Tinto river water under laboratory experiments resulting in the formation of aluminocopiapite, halotrichite, coquimbite, voltaite and gypsum. * E-mail: [email protected] 14 01...

...., by solutions of linear simultaneous equations. Proportions in the X and R positions of the structural formula are assumed 1:4 on the basis of substitution which at the same time serves as a check on obtained solutions. Identified species of the copiapite group include aluminocopiapite, copiapite...

..., coquimbite is represented by large purple transparent crystals in close association with dark red-brown aggregates of römerite. Coquimbite crystals are enclosed by aluminocopiapite. Due to the relatively large amount of water molecules per formula unit in coquimbite, only a qualitative microprobe analysis...

...) triclinic, P 1̅ Süsse (1972) ; Fanfani et al. (1973) ; Bayliss and Atencio (1985)     aluminocopiapite Al 2/3 Fe 4 3+ (SO 4 ) 6 (OH) 2 ·20H 2 O     magnesiocopiapite Mg 2 Fe 4 3+ (SO 4 ) 6 (OH) 2 ·20H 2 O     calciocopiapite Ca Fe 4 3+ (SO 4 ) 6 (OH) 2 ·20H 2 O...

..., as long as the grain size decreases, the presence of aluminocopiapite (Al 2/3 Fe 4 3 + (SO 4 ) 6 (OH) 2 ·20H 2 O), a highly soluble efflorescent sulphate, is more abundant ( Fig. 3 ). The presence of this mineral would explain the increase of S, Fe and Al observed in the fine grain sized...

... in the literature ( Bayliss and Atencio, 1985 ); however, it is virtually impossible to distinguish magnesiocopiapite from aluminocopiapite based on the lattice parameters. Alunogen [Al 2 (SO 4 ) 3 ·17H 2 O] is detected only in the diffraction patterns as an admixture in the samples newly studied and analysed...

...-21 1.20 2.0709 Al 2 (SO 4 ) 3 ·17H 2 O 0.4291 Aluminocopiapite HSC-95 1.20 1.9597 ZnSO 4 ·7H 2 O 0.5403 Zincocopiapite HSC-96 1.20 1.9696 NiSO 4 ·7H 2 O 0.5304 Ni analogue of copiapite HSC-128 1.20 1.9738 FeSO 4 ·7H 2 O 0.5262 Copiapite HSC-150 1.20 2.0980 CuSO 4 ·5H 2...

... produced of the gas escaping from the slide are too high for coal oxidation. Pyrite clearly occurred in local concentrations in the formation; however, we do not see any of the hydrated iron sulfates (aluminocopiapite, melanterite, fibroferrite, rhomboclase, etc.) that Zodrow et al. (1979) described...

... good, with 178 (about 60%) in the combined superior and excellent categories. The species in all of the categories are listed below. Aluminite, aluminocopiapite, alunogen, amarillite, anorthominasragrite, antlerite, aphthitalite, apjohnite, arcanite, aubertite, barite, bianchite, bieberite...

... include aluminocopiapite, amarantite, botryogen, copiapite, cuprocopiapite, fibroferrite, halotrichite, jarosite, krausite, metahohmannite, metavoltine, natrojarosite, parabutlerite, paracoquimbite, pickeringite, quenstedtite, rhomboclase, römerite, sideronatrite and szomolnokite. T he new mineral...

.../3Fe 3+ (ferricopiapite), and 2/3Al 3+ (aluminocopiapite). The crystal structure of this group of minerals was solved by Süsse (1972) for magnesiocopiapite, and by Fanfani et al. (1973) for ferricopiapite. In this study, we investigated the structure of synthetic, deuterated ferricopiapite...

... sulfates of Al are members of the halotrichite–pickeringite series [Fe 2+ Al 2 (SO 4 ) 4 ·22H 2 O − MgAl 2 (SO 4 ) 4 ·22H 2 O], whereas aluminocopiapite and alunogen are less widespread ( Blowes et al. 2003b ). This is also the case at Bányabérc. Once formed, halotrichite- group minerals are stable...

... 4 ) 3 ] 2 {Zn(H 2 O) 6 }(H 2 O) 6 7.33 18.72 7.35 91.5 102.1 98.7 P 1̅ 20i 23c,d (4) aluminocopiapite [Fe 3+ 2 (OH)(H 2 O) 4 (SO 4 ) 3 ] 2 {Al 067 □ 033 )(H 2 O) 6 7.251 18.161 7.267 94.0 102.2 98.0 P 1̅ 20i 23c,d (19) destinezite [Fe 3+ 2 (OH)(H 2 O) 5 (PO 4 )(SO...

... melanterite Fe II SO 4 ·7H 2 O siderotil Fe II SO 4 ·5H 2 O rozenite Fe II SO 4 ·4H 2 O szomolnokite Fe II SO 4 ·H 2 O copiapite Fe II Fe 4 III (SO 4 ) 6 (OH) 2 ·20H 2 O aluminocopiapite Al 2/3 Fe III 4 (SO 4 ) 6 (OH) 2 ·20H 2 O römerite Fe II Fe 2 III (SO 4 ) 4 ·14H 2 O...

..., anglesite and barite . Can. Mineral . 36 , 1053 – 1060 . Jarosch , D. ( 1985 ): Kristallstruktur des Leonits, K 2 Mg(SO 4 ) 2 ·4H 2 O . Z. Kristallogr . 173 , 75 – 79 . Jolly , J.H. & Foster , H.L. ( 1967 ): X-ray diffraction data of aluminocopiapite . Am. Mineral...

... with ferrinatrite, krausite, pertlikite, pyrite, tamarugite, and voltaite. Other minerals at the deposit include aluminocopiapite, amarantite, botryogen, copiapite, cuprocopiapite, fibroferrite, halotrichite, jarosite, krausite, metahohmannite, metavoltine, natrojarosite, parabutlerite, paracoquimbite, pickeringite...

... as aluminocopiapite [(Al,Mg) Fe 4 3 + (SO 4 ) 6 (OH,O) 2 ·20H 2 O]; however, the element ratios are inconsistent with this identification. Until more information is forthcoming, we designate this phase as SA unnamed Mg-Al-Fe sulfate. The matrices of some CI chondrites contain the hydrous Na...