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trechmannite

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Journal Article
Published: 01 August 1968
American Mineralogist (1968) 53 (7-8): 1208–1214.
...George W. Roland Abstract A phase of AgAsS 2 composition prepared by crystallizing AgAsS 2 glass at 290°C for 315 hours is identical to the rare sulfosalt mineral trechmannite. The synthetic material is hexagonal (rhombohedral) and least-squares refinement of X-ray powder-dif-fraction data yields...
Journal Article
Published: 01 February 1989
American Mineralogist (1989) 74 (1-2): 243–249.
...L. Taras Bryndzia; O.J. Kleppa Abstract High‐temperature direct‐synthesis calorimetry of the silver thioarsenite minerals smithite (AgAsS 2 ), trechmannite (AgAsS 2 ), and proustite (Ag 3 AsS 3 ) at 793 K yielded mean values for the standard enthalpy of formation from the elements of −59.1 ± 2.3...
Journal Article
Published: 01 July 2013
Journal of Paleontology (2013) 87 (4): 726–754.
...Jose Maria Pons; Enric Vicens; Angélica Oviedo; Javier Aguilar; Pedro García-Barrera; Gloria Alencáster A bstract A Maastrichtian rudist fauna composed of the radiolitids Biradiolites aguilerae Böse, B. Cárdenasensis Böse, Huasteca ojanchalensis (Myers), Tampsia floriformis Myers, and Trechmannites...
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Journal Article
Published: 01 February 2006
The Canadian Mineralogist (2006) 44 (1): 135–140.
..., such as hutchinsonite, hatchite, edenharterite, trechmannite, tennantite, and abundant realgar and rathite, generally occurring as idiomorphic crystals in cavities of a Triassic dolomitic rock. The whole region was transformed during the Alpine orogeny to the greenschist to garnet-amphibolite facies of metamorphism...
FIGURES
Journal Article
Journal: Economic Geology
Published: 01 May 1970
Economic Geology (1970) 65 (3): 241–252.
... encountered: proustite and xanthoconite (both Ag 3 AsS 3 ), smithite and trechmannite (both AgAsS 2 ), and Ag 7 AsS 6 . The phase relations of proustite were studied in detail. The maximum temperatures at which proustite can coexist with either Ag 7 AsS 6 , Ag 2 S, As, or smithite are, respectively, 480...
Image
Bond lengths versus electron density at the bond critical point for the various As–S, As–As, As–Ag, Ag–S, Ag–Ag bonded interactions found in the procrystal electron-density distribution for the sulfosalt minerals billingsleyite (filled circles), xanthoconite (filled squares), trechmannite (crosses) and proustite (open circles).
Published: 01 February 2010
), trechmannite (crosses) and proustite (open circles).
Journal Article
Published: 01 June 2015
Mineralogical Magazine (2015) 79 (3): 687–694.
..., trechmannite and yellow, fibrous smithite. In thick section eckerite is opaque with a metallic lustre and shows a dark orange-red streak. It is brittle; the Vickers hardness (VHN 25 ) is 70 kg/mm 2 (range: 64–78) (Mohs hardness of ~2½–3). In reflected light, eckerite is moderately bireflectant and weakly...
FIGURES
Journal Article
Published: 01 October 2012
Mineralogical Magazine (2012) 76 (5): 1153–1163.
... smithite, realgar, hatchite and probable trechmannite, edenharterite, jentschite and two unidentified sulfosalts. Raberite is opaque with a metallic lustre and has a dark brown–red streak. It is brittle with a Vickers hardness (VHN 10 ) of 52 kg mm −2 (range 50–55) corresponding to a Mohs hardness of 2½–3...
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Journal Article
Published: 01 June 2012
Mineralogical Magazine (2012) 76 (3): 743–750.
... marble, associated with realgar, rutile, trechmannite and hutchinsonite. Debattistiite is opaque with a metallic lustre and a grey streak. It is brittle; the Vickers hardness (VHN 25 ) is 80 kg mm −2 (range: 65–94), corresponding to a Mohs hardness of 2–2½. In reflected light debattistiite is dark grey...
FIGURES
Image
Trechmannites rudissimus (Trechmann, 1924), transverse sections of right valves, scale bar=10 mm: 1, PUAB 81128, Cárdenas 3, close below the commissural plane showing myocardinal elements; 2, IGM 9449, Amoladeras; 3, IGM 9445, Amoladeras; 4, IGM 9443, Amoladeras; 5, IGM 9450, Amoladeras; 6, PUAB 81108, Amoladeras; 7, IGM 9447, Amoladeras; 8, IGM 9444, Amoladeras.
Published: 01 July 2013
Figure 14 Trechmannites rudissimus ( Trechmann, 1924 ), transverse sections of right valves, scale bar=10 mm: 1 , PUAB 81128, Cárdenas 3, close below the commissural plane showing myocardinal elements; 2 , IGM 9449, Amoladeras; 3 , IGM 9445, Amoladeras; 4 , IGM 9443, Amoladeras; 5 , IGM
Image
Trechmannites rudissimus (Trechmann, 1924), stereo pairs of bivalve specimens, scale bar=10 mm: 1, 2, PUAB 81099, Amoladeras, upper and ventral-posterior views respectively; 3, IGM 9448, Amoladeras, ventral-posterior view; 4, PUAB 81104, Amoladeras, ventral-posterior view; 5, IGM 9446, Amoladeras, ventral-posterior view; 6, PUAB 81126, Cárdenas 3, ventral-posterior view; 7, PUAB 81118, Cárdenas 3, ventral-posterior view.
Published: 01 July 2013
Figure 13 Trechmannites rudissimus ( Trechmann, 1924 ), stereo pairs of bivalve specimens, scale bar=10 mm: 1, 2 , PUAB 81099, Amoladeras, upper and ventral-posterior views respectively; 3 , IGM 9448, Amoladeras, ventral-posterior view; 4 , PUAB 81104, Amoladeras, ventral-posterior view
Image
Trechmannites rudissimus (Trechmann, 1924), thin sections of outer shell layer of right valves, enlarged areas are indicated, scale bars=10 mm: 1, 3, 5, 7, PUAB 81108, Amoladeras; 2, 4, 6, 8, PUAB 81128, Cárdenas 3; 1, 2, radial sections, inner margin at right; 3, 4, transverse sections at the radial structures part; 5, 6, details of radial sections, inner margin at right; 7, 8, details of transverse sections, inner margin at left.
Published: 01 July 2013
Figure 15 Trechmannites rudissimus ( Trechmann, 1924 ), thin sections of outer shell layer of right valves, enlarged areas are indicated, scale bars=10 mm: 1 , 3 , 5 , 7 , PUAB 81108, Amoladeras; 2 , 4 , 6 , 8 , PUAB 81128, Cárdenas 3; 1, 2 , radial sections, inner margin at right
Journal Article
Published: 01 February 2010
The Canadian Mineralogist (2010) 48 (1): 155–162.
...), trechmannite (crosses) and proustite (open circles). ...
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Image
Phase diagrams for the Ag2S-Cu2S-AgSbS2-CuSbS2 and Ag2S-Cu2S-AgAsS2-CuAsS2 quadrilaterals of the systems Ag2S-Cu2S-Sb2S3 and Ag2S-Cu2S-As2S3 at 150, 200, 250, 300, and 350 °C (a-e) and mineral index (f). Mineral abbreviations: stephanite (st), ~(Ag,Cu)5SbS4; lautite (lt), ~ (Cu,Ag)AsS; tennantite (tnn), ~ (Cu,Ag)12+xAs4+yS13; phase A (A), ~ (Cu,Ag)24As12S30; sinnerite (sin), ~ (Cu,Ag)6As4S9; smithite (smt) ~ (Ag,Cu)AsS2; trechmannite (tmt), ~ (Ag,Cu)AsS2; arsenostephanite (As-st), ~ (Ag,Cu)5AsS4. [Used by permission of Elsevier Ltd, from Harlov and Sack (1995b), Geochim Cosmochim Acta, Vol. 59, Fig. 2, p. 4353.]
Published: 01 January 2006
) 5 SbS 4 ; lautite ( lt ), ~ (Cu,Ag)AsS; tennantite ( tnn ), ~ (Cu,Ag) 12+x As 4+y S 13 ; phase A ( A ), ~ (Cu,Ag) 24 As 12 S 30 ; sinnerite ( sin ), ~ (Cu,Ag) 6 As 4 S 9 ; smithite ( smt ) ~ (Ag,Cu)AsS 2 ; trechmannite (tmt), ~ (Ag,Cu)AsS 2 ; arsenostephanite ( As-st ), ~ (Ag,Cu) 5 AsS 4 . [Used
Journal Article
Published: 01 July 2015
American Mineralogist (2015) 100 (7): 1649–1654.
... specimens from zone 1 of the quarry in cavities in dolomitic marble with realgar, rutile, trechmannite, and hutchinsonite. The mineral occurs as very rare tabular euhedral black, opaque crystals up to 150 μm with a metallic luster and a gray streak. It is brittle with uneven fracture and no cleavage...
Journal Article
Published: 01 October 2013
The Canadian Mineralogist (2013) 51 (5): 727–734.
...) – xanthoconite (Breithaupt in 1840), pyrargyrite (by Glocker in 1831) – pyrostilpnite (by Dana in 1868), as well as trechmannite (described by Solly in 1904) – smithite (by the same author in 1905). Miargyrite was described by Rose in 1829, whereas the isochemical cubic cuboargyrite was redefined by Walenta...
FIGURES
Journal Article
Published: 01 February 2012
The Canadian Mineralogist (2012) 50 (1): 101–109.
... relations established by Barstad (1959) , Cambi & Elli (1965) , Somanchi (1966) , Hall (1968) , Keighin & Honea (1969) , and Wehmeier et al . (1968) . In the Ag-As-S system, billingsleyite, proustite, smithite, and trechmannite were synthesized and their phase equilibria were determined...
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Journal Article
Published: 01 May 2002
American Mineralogist (2002) 87 (5-6): 753–764.
..., El Quevar (EQ 95/9). Several minerals with the chemical formula AgMS 2 (M = As, Sb, Bi) have previously been described: (1) M = As: monoclinic smithite ( Hellner and Burzlaff 1964 ), trigonal trechmannite ( Matsumoto and Nowacki 1969 ); (2) M = Sb: monoclinic miargyrite ( Hofmann 1938...
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Journal Article
Published: 01 October 2013
Mineralogical Magazine (2013) 77 (7): 3039–3046.
..., trechmannite, smithite, miargyrite, andorite, geocronite, seligmannite, guettardite ( Makovicky et al. , 2012 ), and in addition, realgar, pyrite and Au-Ag alloys. The chemical remobilization of the components originally housed by the stratiform ores, which led to the formation of these minerals, took place...
FIGURES
Journal Article
Published: 01 February 2016
American Mineralogist (2016) 101 (2): 487–492.
... veinlets with Ag-As-Sb-Pb-rich sulfosalts: tetrahedrite-tennantite, stephanite, pyrargyrite, trechmannite, smithite, miargyrite, andorite, geocronite, seligmannite, guettardite and realgar and Ag-Au alloys. Barikaite is always found in association with guettardite in quartz veins hosting irregular thin...