Contributions to mineralogy; No. 54. With crystallographic notes by S. L. Penfield

Genth, F. A.

doi:10.2475/ajs.s3-44.263.381

Cited by 6 publications

(3 citation statements)

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“…Early studies of aguilarite Aguilarite was described by Genth (1891Genth ( , 1892 and named after Mr P. Aguilar, who was the superintendent of San Carlos Mine, Guanajuato, Mexico, which is the type locality. The initial description predates both X-ray diffraction and electron-probe microanalysis.…”

Section: Aguilarite Reviewmentioning

confidence: 99%

“…Xiao et al, 2012); it has been of considerable interest in mineral sciences for many years due to the importance of the minerals involved. At ambient conditions these are: acanthite, Ag 2 S, which is monoclinic, space group P2 1 /n according to Frueh (1958); naumannite, Ag 2 Se, which is orthorhombic, space group P2 1 2 1 2 1 according to Wiegers (1971); and the intermediate member aguilarite (Genth, 1891(Genth, , 1892, Ag 4 SeS, which is orthorhombic according to Petruk et al (1974) and is listed as such in several mineralogical databases (e.g. www.webmineral.com; www.mindat.org), although there are no detailed structural studies.…”

Section: Introductionmentioning

confidence: 99%

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On the symmetry and crystal structure of aguilarite, Ag₄SeS

Bindi¹,

Pingitore²

2013

Mineral. mag.

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An examination of a specimen of aguilarite from the type locality provides new data on the chemistry and structure of this mineral. The chemical formula of the crystal used for the structural study is (Ag3.98 Cu0.02)(Se0.98 S0.84 Te0.18), on the basis of 6 atoms. The mineral was found to be monoclinic, crystallizing in space group P 21/n, with a = 4.2478(2), b = 6.9432(3), c = 8.0042(5) Å , β = 100.103(2)º, V = 232.41(2) Å3 and Z = 4. The crystal structure [refined to R1 = 0.0139 for 958 reflections with I > 2 σ (I)] is topologically identical to that of acanthite, Ag2S. It can be described as a body-centred array of tetrahedrally coordinated X atoms (X = S, Se and Te) with Ag2X3 triangles in planes nearly parallel to (010); the sheets are linked by the Ag1 silver site, which has twofold coordination.Aguilarite is definitively proved to be isostructural with acanthite; it does not have a naumannite-like structure, as previously supposed. Our data support the hypothesis that there are two solid solution series in the system: a monoclinic 'acanthite-like' series (from Ag2S - Ag2S0.4Se0.6), and an orthorhombic 'naumannite-like' series (from Ag2S0.3Se0.7-Ag2Se). This is supported by data gathered on synthetic counterparts. Aguilarite remains as a valid as a mineral species, but it should be described as the Se-analogue of acanthite.In this study we also (1) review the history of the aguilarite; (2) compare properties of synthetic and natural aguilarite; and (3) demonstrate how earlier researchers erred in describing aguilarite as orthorhombic.The Te-bearing composition of the studied aguilarite crystal suggests the possibility of a solid solution with cervelleite (Ag4TeS).

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Section: Aguilarite Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the symmetry and crystal structure of aguilarite, Ag₄SeS

Bindi¹,

Pingitore²

2013

Mineral. mag.

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“…Aguilarite as a new mineral was recognized by Genth (1891Genth ( , 1892 in samples sent to him from the San Carlos Mine at Guanajuato, Mexico 2 . This fairly uncommon mineral was found e.g., in the ores at Comstock Lode near Virginia City in Nevada, where it was "unsuspected" (Coats 1936, p. 532).…”

Section: Aguilarite Ag 4 Sesmentioning

confidence: 99%

Acta Geologica Polonica

2022

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Twenty silver minerals of the sulphide, arsenide, selenide, telluride, sulphosalt and chloride groups were found in 13 locations in the Variscan Karkonosze granitoid pluton. Previously only one of these minerals was known from this area. The findings include species characterized in publications as rare or exceptionally rare, e.g., muthmannite and tsnigriite. They occur in pegmatites and quartz veins; their parageneses are described. The studies include determination of chemical compositions, formulae calculations and recording of XRD patterns. Inclusion studies in paragenetic quartz indicate that they crystallized from epithermal fluids with a common but low component of CO 2. The results suggest that the minerals formed from trace elements (Ag included) in the Karkonosze granitoid due to very local degrees of recrystallization of the host granitoid.

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