干旱区生态环境知识资源中心(Arid): Cuatrocapaite-(NH4) and cuatrocapaite-(K), two new minerals from the Torrecillas mine, Iquique Province, Chile, related to lucabindiite and gajardoite

Arid

DOI	10.1180/mgm.2019.26
	Cuatrocapaite-(NH4) and cuatrocapaite-(K), two new minerals from the Torrecillas mine, Iquique Province, Chile, related to lucabindiite and gajardoite
	Kampf, Anthony R.1; Chukanov, Nikita, V 2; Moehn, Gerhard 3; Dini, Maurizio ; Molina Donoso, Arturo A.; Friis, Henrik 4
通讯作者	Kampf, Anthony R.
来源期刊	MINERALOGICAL MAGAZINE
ISSN	0026-461X
EISSN	1471-8022
出版年	2019
卷号	83 期号:5 页码:741-748
英文摘要	The new minerals cuatrocapaite-(NH4) (IMA2018-083) and cuatrocapaite-(K) (IMA2018-084) are the NH4- and K-dominant members of a series with the general formula (NH4,K)(3) (NaMg rectangle)(As2O3)(6)Cl-6-16H(2)O. Both minerals were found at the Torrecillas mine, Iquique Province, Chile, where they occur as secondary alteration phases. Both minerals occur as hexagonal tablets up to similar to 0.3 mm in diameter. They are transparent, with a vitreous lustre and white streak. For both, the Mohs hardness is ca. 21/2, the crystals are somewhat flexible, but not elastic, the fracture is irregular and the cleavage is perfect on {001}. The measured densities are 2.65(2) and 2.76(2) g/cm(3) for the NH4- and K-dominant species, respectively. Optically, cuatrocapaite-(NH4) is uniaxial (-) with omega= 1.779(3) and epsilon = 1.541(3) and cuatrocapaite-(K) is uniaxial (-) with omega = 1.777(3) and epsilon = 1.539(3) (white light). The minerals are insoluble in acids, but decompose in NaOH(aq). The empirical formulas, determined from electron-microprobe analyses, are (NH4)(2.48)Na1.66Mg0.87K0.09(As12O18.05) Cl-5.(88)center dot 16.02H(2)O and K2.68Na1.33Mg0.93(NH4)(0.31)(As12O18.01)Cl-6.16 center dot 16.04H(2)O. The minerals are trigonal, space group R (3) over barm; the cuatrocapaite-(NH4) cell parameters are a = 5.25321(19), c = 46.6882(19) angstrom, V= 1115.80(9) angstrom(3) and Z = 1; the cuatrocapaite-(K) cell parameters are a = 5.2637(15), c = 46.228(8) angstrom, V= 1109.2(7) angstrom(3) and Z = 1. The structures, refined for cuatrocapaite-(NH4) to R-1 = 1.78% for 544 I-o > 2 sigma 1 reflections, contain four types of layers: (1) a planar neutral As2O3 (arsenite) sheet; (2) an (NH4+,K+) layer that links adjacent arsenite sheets; (3) a Cl- layer placed on the As side of each arsenite; and (4) a layer containing partially occupied Na, Mg and H2O sites that is flanked on either side by Cl layers. The layer sequence for the type 1, 2 and 3 layers is identical to the Cl-As2O3-K-As2O3-Cl layer sequence in the structures of lucabindiite and gajardoite.
英文关键词	cuatrocapaite-(NH4) cuatrocapaite-(K) new mineral arsenite crystal structure lucabindiite gajardoite Torrecillas mine Chile
类型	Article
语种	英语
国家	USA ; Russia ; Germany ; Norway
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000510231000013
WOS关键词	BOND-VALENCE PARAMETERS ; NORTHERN CHILE ; ATACAMA DESERT
WOS类目	Mineralogy
WOS研究方向	Mineralogy
EI主题词	2019-10-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310096
作者单位	1.Nat Hist Museum Los Angeles Cty, Mineral Sci Dept, 900 Exposit Blvd, Los Angeles, CA 90007 USA; 2.Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia; 3.Dr J Wittemannstr 5, D-65527 Niedernhausen, Germany; 4.Univ Oslo, Nat Hist Museum, Postboks 1172, N-0318 Oslo, Norway
推荐引用方式 GB/T 7714	Kampf, Anthony R.,Chukanov, Nikita, V,Moehn, Gerhard,et al. Cuatrocapaite-(NH4) and cuatrocapaite-(K), two new minerals from the Torrecillas mine, Iquique Province, Chile, related to lucabindiite and gajardoite[J],2019,83(5):741-748.
APA	Kampf, Anthony R.,Chukanov, Nikita, V,Moehn, Gerhard,Dini, Maurizio,Molina Donoso, Arturo A.,&Friis, Henrik.(2019).Cuatrocapaite-(NH4) and cuatrocapaite-(K), two new minerals from the Torrecillas mine, Iquique Province, Chile, related to lucabindiite and gajardoite.MINERALOGICAL MAGAZINE,83(5),741-748.
MLA	Kampf, Anthony R.,et al."Cuatrocapaite-(NH4) and cuatrocapaite-(K), two new minerals from the Torrecillas mine, Iquique Province, Chile, related to lucabindiite and gajardoite".MINERALOGICAL MAGAZINE 83.5(2019):741-748.