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Mauriziodiniite, NH (sub 4) (As (sub 2) O (sub 3) ) (sub 2) I, the ammonium and iodine analogue of lucabindiite from the Torrecillas Mine, Iquique Province, Chile

Anthony R. Kampf, Barbara P. Nash and Arturo A. Molina Donoso
Mauriziodiniite, NH (sub 4) (As (sub 2) O (sub 3) ) (sub 2) I, the ammonium and iodine analogue of lucabindiite from the Torrecillas Mine, Iquique Province, Chile
Mineralogical Magazine (April 2020) 84 (2): 267-273

Abstract

The new mineral mauriziodiniite (IMA2019-036), NH (sub 4) (As (sub 2) O (sub 3) ) (sub 2) I, was found at the Torrecillas mine, Iquique Province, Chile, where it is a secondary alteration phase associated with calcite, cuatrocapaite-(NH (sub 4) ), lavendulan, magnesiokoritnigite and torrecillasite on matrix consisting of native arsenic, arsenolite and pyrite. Mauriziodiniite occurs as hexagonal tablets up to approximately 300 mu m in diameter. Crystals are colourless and transparent, with pearly to adamantine lustre and white streak. The Mohs hardness is approximately 1. Tablets are sectile and easily flexible, but not elastic. Fracture is curved, irregular and stepped. Cleavage is perfect on {001}. The calculated density is 3.916 g/cm (super 3) . Optically, mauriziodiniite is uniaxial (-) with omega = 2.07(calc) and epsilon = 1.770(5) (white light). The empirical formula, determined from electron microprobe analyses, is (NH (sub 4) ) (sub 0.94) K (sub 0.03) (As (sub 2) O (sub 3) ) (sub 2) I (sub 0.92) Cl (sub 0.03) . Mauriziodiniite is hexagonal, P6/mmm, a = 5.289(2), c = 9.317(2) Aa, V = 225.68(18) Aa (super 3) and Z = 1. The structure, refined to R (sub 1) = 4.16% for 135 I (sub o) > 2sigma I reflections, contains three types of layers: (1) a planar neutral As (sub 2) O (sub 3) (arsenite) sheet; (2) an NH (sub 4) (super +) layer that links adjacent arsenite sheets via bonds to their O atoms; and (3) an I (super -) layer that links adjacent arsenite sheets via bonds to their As atoms. The layer sequence is I-As (sub 2) O (sub 3) -NH (sub 4) -As (sub 2) O (sub 3) -I. Mauriziodiniite is isostructural with lucabindiite and is structurally related to gajardoite, cuatrocapaite-(NH (sub 4) ), cuatrocapaite-(K) and torrecillasite.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 84
Serial Issue: 2
Title: Mauriziodiniite, NH (sub 4) (As (sub 2) O (sub 3) ) (sub 2) I, the ammonium and iodine analogue of lucabindiite from the Torrecillas Mine, Iquique Province, Chile
Affiliation: Natural History Museum of Los Angeles County, Mineral Sciences Department, Los Angeles, CA, United States
Pages: 267-273
Published: 202004
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 24
Accession Number: 2020-051328
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
S20°58'13" - S20°58'13", W70°08'17" - W70°08'17"
Secondary Affiliation: University of Utah, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2020
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