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alacranite

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Journal Article

Alacranite, As8S9: structural study of the holotype and re-assignment of the original chemical formula Available to Purchase

Paola Bonazzi, Luca Bindi, Valentina Popova, Giovanni Pratesi, Silvio Menchetti
Published: 01 November 2003
American Mineralogist (2003) 88 (11-12): 1796–1800.
DOI: https://doi.org/10.2138/am-2003-11-1220
...Paola Bonazzi; Luca Bindi; Valentina Popova; Giovanni Pratesi; Silvio Menchetti Abstract Alacranite from the type locality (Uzon caldera, Kamchatka, Russian Federation) was submitted for structural analysis. A single crystal was selected and the following lattice parameters were determined...
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Journal Article

ALACRANITE, As 4 S 4 : A NEW OCCURRENCE, NEW FORMULA, AND DETERMINATION OF THE CRYSTAL STRUCTURE Available to Purchase

Peter C. Burns, Jeanne B. Percival
Published: 01 June 2001
The Canadian Mineralogist (2001) 39 (3): 809–818.
DOI: https://doi.org/10.2113/gscanmin.39.3.809
... of alacranite and realgar associated with polymetallic vein mineralization consisting of pyrite, sphalerite, galena, minor chalcopyrite and sulfosalts, along with intense clay and silica (amorphous) alteration. Alacranite occurs as subhedral to euhedral tabular orange crystals that are transparent...
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Journal Article

How many alacranites do exist? A structural study of non-stoichiometric As 8 S 9-x crystals Available to Purchase

Paola BONAZZI, Luca BINDI, Filippo OLMI, Silvio MENCHETTI
Published: 01 March 2003
European Journal of Mineralogy (2003) 15 (2): 283–288.
DOI: https://doi.org/10.1127/0935-1221/2003/0015-0283
...Paola BONAZZI; Luca BINDI; Filippo OLMI; Silvio MENCHETTI Abstract Crystals of arsenic sulphide (reported as alacranite ), coming from the burning dump of Kateřina Mine (Czech Republic), have been investigated by single crystal X-ray diffraction and chemical microanalysis. Both analytical data...
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SEM photomicrograph, back-scattered image, of alacranite from alacranite-rich zone shown in Figure 3 (magnification 600x).

SEM photomicrograph, back-scattered image, of alacranite from alacranite-ri... Available to Purchase

Published: 01 June 2001
F ig . 5. SEM photomicrograph, back-scattered image, of alacranite from alacranite-rich zone shown in Figure 3 (magnification 600x).
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Original sample from station 26GTVA examined using X-ray powder-diffraction methods. Red crystals are realgar, orange crystals are alacranite, and white masses are amorphous silica. Alacranite crystals used for detailed analysis of the structure were taken along the cavity outlined by box.

Original sample from station 26GTVA examined using X-ray powder-diffraction... Available to Purchase

Published: 01 June 2001
F ig . 3. Original sample from station 26GTVA examined using X-ray powder-diffraction methods. Red crystals are realgar, orange crystals are alacranite, and white masses are amorphous silica. Alacranite crystals used for detailed analysis of the structure were taken along the cavity outlined
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The a, b, and c-sinβ parameters plotted against unit-cell volumes. Filled circles refer to alacranites from Kateřina Mine (this study). Empty symbols refer to data from literature. Down triangle: synthetic β-As4S4 (Porter &amp; Sheldrick, 1972); square: synthetic As2S2.15 (Kothiyal &amp; Ghosh, 1976); circle: alacranite from Kamchatka (Popova et al., 1986).

The a, b , and c -sinβ parameters plotted against unit-cell volumes. Fill... Available to Purchase

Published: 01 March 2003
Fig. 3. The a, b , and c -sinβ parameters plotted against unit-cell volumes. Filled circles refer to alacranites from Kateřina Mine (this study). Empty symbols refer to data from literature. Down triangle: synthetic β-As 4 S 4 ( Porter & Sheldrick, 1972 ); square: synthetic As 2 S 2.15
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Unit-cell volume plotted against the As4S5 percentage. Filled circles refer to alacranites from Kateřina Mine (this study). Empty symbols refer to data from literature. Down triangle: synthetic β-As4S4 (Porter &amp; Sheldrick, 1972); square: synthetic As2S2.15 (Kothiyal &amp; Ghosh, 1976); circle: alacranite from Kamchatka (Popova et al., 1986); up triangle: synthetic As4S5 (Whitfield, 1973).

Unit-cell volume plotted against the As 4 S 5 percentage. Filled circles r... Available to Purchase

Published: 01 March 2003
Fig. 4. Unit-cell volume plotted against the As 4 S 5 percentage. Filled circles refer to alacranites from Kateřina Mine (this study). Empty symbols refer to data from literature. Down triangle: synthetic β-As 4 S 4 ( Porter & Sheldrick, 1972 ); square: synthetic As 2 S 2.15 ( Kothiyal
Journal Article

An insight into the inverse transformation of realgar altered by light Available to Purchase

Giovanni Pratesi, Matteo Zoppi
Published: 01 May 2015
American Mineralogist (2015) 100 (5-6): 1222–1229.
DOI: https://doi.org/10.2138/am-2015-5045
... pararealgar and amorphous material turn into stoichiometric alacranite, while in the second case the alteration is completely reversible. Similarly, the present study focuses the attention on the question if realgar, when altered by means of the light and when annealed, might behave as β-As 4 S 4 does...
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MISCELLANEOUS INFORMATION PERTAINING TO ALACRANITE Available to Purchase

Published: 01 June 2001
TABLE 1. MISCELLANEOUS INFORMATION PERTAINING TO ALACRANITE
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FINAL ATOMIC PARAMETERS FOR ALACRANITE Available to Purchase

Published: 01 June 2001
TABLE 2. FINAL ATOMIC PARAMETERS FOR ALACRANITE
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Selected interatomic distances (Å) and angles (°) for the alacranites ex... Available to Purchase

Published: 01 March 2003
Table 6. Selected interatomic distances (Å) and angles (°) for the alacranites examined.
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SELECTED INTERATOMIC DISTANCES (Å) AND ANGLES (°) IN THE STRUCTURE OF ALAC... Available to Purchase

Published: 01 June 2001
TABLE 3. SELECTED INTERATOMIC DISTANCES (Å) AND ANGLES (°) IN THE STRUCTURE OF ALACRANITE
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Chemical compositions (wt. % el.) and atomic ratios for alacranites from ... Available to Purchase

Published: 01 March 2003
Table 2. Chemical compositions (wt. % el.) and atomic ratios for alacranites from Kateřina Mine.
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The structures of alacranite and realgar. S atoms are shown in yellow, As atoms, in brown.

The structures of alacranite and realgar. S atoms are shown in yellow, As a... Available to Purchase

Published: 01 June 2001
F ig . 7. The structures of alacranite and realgar. S atoms are shown in yellow, As atoms, in brown.
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Unit cell parameters for alacranites from Kateřina Mine together with da... Available to Purchase

Published: 01 March 2003
Table 1. Unit cell parameters for alacranites from Kateřina Mine together with data from literature.
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Discrete covalently bonded As4S4 molecules in the structures of alacranite, realgar and pararealgar.

Discrete covalently bonded As 4 S 4 molecules in the structures of alacran... Available to Purchase

Published: 01 June 2001
F ig . 6. Discrete covalently bonded As 4 S 4 molecules in the structures of alacranite, realgar and pararealgar.
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SEM micrograph of a crystal of alacranite together with amorphous As-S alloy from Kateřina Mine, Czech Republic.

SEM micrograph of a crystal of alacranite together with amorphous As-S al... Available to Purchase

Published: 01 March 2003
Fig. 1. SEM micrograph of a crystal of alacranite together with amorphous As-S alloy from Kateřina Mine, Czech Republic.
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As4S4 (a) and As4S5 (b) molecules in alacranite viewed along the c axis.

As 4 S 4 (a) and As 4 S 5 (b) molecules in alacranite viewed along the ... Available to Purchase

Published: 01 March 2003
Fig. 2. As 4 S 4 (a) and As 4 S 5 (b) molecules in alacranite viewed along the c axis.
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Background subtracted diffraction pattern of sample A. From top to bottom: observed, calculated, residual pattern, and reflections positions for alacranite and arsenolite are reported.

Background subtracted diffraction pattern of sample A. From top to bottom: ... Available to Purchase

Published: 01 May 2012
Figure 6 Background subtracted diffraction pattern of sample A. From top to bottom: observed, calculated, residual pattern, and reflections positions for alacranite and arsenolite are reported.
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SEM photomicrograph, back-scattered image, of realgar from alacranite-rich zone shown in Figure 3 (magnification 350x).

SEM photomicrograph, back-scattered image, of realgar from alacranite-rich ... Available to Purchase

Published: 01 June 2001
F ig . 4. SEM photomicrograph, back-scattered image, of realgar from alacranite-rich zone shown in Figure 3 (magnification 350x).