...F ig . 7. Multifaced crystals of talmessite. The scale bar represents 20 μm. ...

..., calcite, claudetite, ferrinatrite, gajardoite-3 R , leiteite, magnesiocopiapite, phosphosiderite, pyrite, realgar and talmessite and formed from the oxidation of As-bearing primary phases and alteration by saline fluids derived from evaporating meteoric water under hyperarid conditions. Cuyaite occurs...

... on massive quartz–hematite also in association with anhydrite, gypsum, halite and talmessite. Camanchacaite is monoclinic, C 2/ c , a = 12.470(9), b = 12.554(9), c = 6.848(9) Å, β = 113.75(2)°, V = 981.3(16) Å 3 and Z = 4. It has a protonated alluaudite-type structure. Chinchorroite is triclinic, P $\bar{1...

... as tetrahedra, dodecahedra (up to 0.50 × 0.50 × 0.50 mm), or in blocky aggregates. Associated minerals include talmessite, vladimirite, and Sr-bearing hydroxylapatite. Similar to the associated minerals, segerstromite is a secondary mineral. The new mineral is colorless in transmitted light, transparent...

...Fig. 1 Raman spectra of 1 , compared with Raman spectra of the mineral talmessite (RRUFF ID: R06830). ...

... 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...

... arsenic, arsenolite, chongite, talmessite and torrecillasite. Gajardoite occurs as hexagonal plates up to ∼100 μm in diameter and 5 μm thick, in rosette-like subparallel intergrowths. Crystals are transparent, with vitreous lustre and white streak. The Mohs hardness is ∼1½, tenacity is brittle...

..., chalcopyrite, native gold, erythrite, talmessite/roselite-beta, Cr-bearing yukonite, alumopharmacosiderite, powellite, and a blue-green earthy copper arsenate related to geminite. The mineral results from the weathering of a Variscan hydrothermal As-Co-Ni-Ag-Au vein. The Bou Azzer mine and the similarly named...

... isostructural with fairfieldite and collinsite; of the fairfieldite group, the crystal structures of fair-fieldite, collinsite, strontian collinsite and talmessite have been studied so far. TABLE 1. CRYSTAL DATA FOR FAIRFIELDITE-GROUP MINERALS ¶ In this paper, we provide a short description...

...), gaitite and parabrandtite, respectively. The crystal structures of the first three have been reported by Catti et al. (1977) , Joswig et al. (2004) and Keller et al. (2004) , respectively (note that the use of the mineral name talmessite in the title and text of the second paper is erroneous...

... ). The acceptor of two hydrogen bonds, O4, is oversaturated with 0.18 v.u. (valence units), whereas O2 is undersaturated with 0.19 v.u. Similar results have been calculated for the isostructural minerals collinsite, Ca 2 Mg[PO 4 ] 2 ·2H 2 O ( Brotherton et al. , 1974 ), talmessite, Ca 2 (Mg, Co)[AsO 4 ] 2...

..., as reported by Parker et al. (1963) , but not observed on our sample. Other arsenates found at the property include alumopharmacosiderite, arsenolite, barahonite-(Al), betpakdalite, conichalcite, lavendulan, talmessite, phillipsbornite, and metazeunerite ( Parker et al. 1963 ). Non-arsenate minerals...