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Alacránite

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Formula:
As8S9
System:
Monoclinic
Colour:
Orange to pale gray with ...
Lustre:
Vitreous, Resinous, Greasy
Hardness:
Name:
Named after its discovery locality in Chile.
Different from (unnamed) natural beta-As4S4.

Classification of Alacránite

Approved 1985
2.FA.20

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
A : With As, (Sb), S
2.8.22.

2 : SULFIDES
8 : AmXp, with m:p = 1:1
3.7.6

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
7 : Sulphides etc. of V, As, Sb and Bi
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First Recorded Occurrence of Alacránite

Place of Conservation of First Recorded Material:
Il’menskii Preserve Museum, Miass; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Year of Discovery:
1985
Geological Setting of First Recorded Material:
In hydrothermal As–S veins

Occurrences of Alacránite

Geological Setting:
in the condensation zone of a hydrothermal Hg–Sb–As system as cement in a sandy gravel (Uzon caldera, Russia); formed
at low temperatures in a polymetallic hydrothermal deposit on a submarine seamount (Conical Seamount, Papua New Guinea).

Physical Properties of Alacránite

Vitreous, Resinous, Greasy
Diaphaneity (Transparency):
Translucent
Colour:
Orange to pale gray with rose-yellow internal reflections
Comment:
yellow-orange in transmitted light
Streak:
Yellow-orange
Hardness (Mohs):
Hardness (Vickers):
VHN20=69 kg/mm2
Tenacity:
Very brittle
Cleavage:
Imperfect/Fair
imperfect on {100}
Fracture:
Conchoidal
Density:
3.43(3) g/cm3 (Measured)    3.43 g/cm3 (Calculated)

Crystallography of Alacránite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Space Group Setting:
P2/c
Cell Parameters:
a = 9.942Å, b = 9.601Å, c = 9.178Å
β = 101.94°
Ratio:
a:b:c = 1.036 : 1 : 0.956
Unit Cell Volume:
V 857.1 ų
Z:
2
Morphology:
Crystals are pinacoidal, prismatic, and flattened on [100] , striated parallel [001] on {100} , other faces dull or tarnished, to 1 mm; as subhedral flattened and prismatic grains.
X-Ray Powder Diffraction Data:
d-spacingIntensity
6.89 (40)
5.91 (90)
5.11 (80)
4.05 (70)
3.291 (50)
3.064 (100)
2.950 (90)
Comments:
Uzon caldera, Kamchatka, Russia (ICDD 42-537).

Optical Data of Alacránite

Type:
Biaxial (+)
RI values:
nα = 2.390(1) nγ = 2.520(2)
Max Birefringence:
δ = 0.130
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v
Reflectivity:
400nmR1=13.0%R2= 14.0%
425nmR1=13.2%R2= 14.6%
450nmR1=13.3%R2= 14.8%
475nmR1=13.4%R2= 14.8%
500nmR1=13.3%R2= 14.5%
525nmR1=13.1%R2= 14.3%
550nmR1=13.2%R2= 14.5%
575nmR1=13.4%R2= 14.7%
600nmR1=13.5%R2= 14.8%
625nmR1=13.6%R2= 14.9%
650nmR1=13.7%R2= 15.0%
675nmR1=13.8%R2= 15.0%
700nmR1=13.9%R2= 15.1%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 15.1%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Light gray
Internal Reflections:
Rose-yellow

Chemical Properties of Alacránite

Formula:
As8S9
Essential elements:
All elements listed in formula:

Relationship of Alacránite to other Species

2.FA.05DuranusiteAs4S
2.FA.10DimorphiteAs4S3
2.FA.15bPararealgarAs4S4
2.FA.15aRealgarAs4S4
2.FA.15cUM1970-19-S:AsAs4S4
2.FA.15dUM1970-18-S:AsAs4S4
2.FA.25UzoniteAs4S5
2.FA.30LaphamiteAs2(Se,S)3
2.FA.30OrpimentAs2S3
2.FA.35GetchelliteAsSbS3
2.FA.40Wakabayashilite[(As,Sb)6S9][As4S5]
3.7.1PatróniteVS4
3.7.2DuranusiteAs4S
3.7.3DimorphiteAs4S3
3.7.4RealgarAs4S4
3.7.5PararealgarAs4S4
3.7.7UzoniteAs4S5
3.7.8OrpimentAs2S3
3.7.9Jeromite
3.7.10LaphamiteAs2(Se,S)3
3.7.11GetchelliteAsSbS3
3.7.12Wakabayashilite[(As,Sb)6S9][As4S5]
3.7.13PääkköneniteSb2AsS2
3.7.14StibniteSb2S3
3.7.15MetastibniteSb2S3
3.7.16TellurantimonySb2Te3
3.7.17BismuthiniteBi2S3
3.7.18NevskiteBi(Se,S)
3.7.19GuanajuatiteBi2Se3
3.7.21IkunoliteBi4(S,Se)3
3.7.22LaitakariteBi4Se2S
3.7.23PoubaitePbBi2(Se,Te,S)4
3.7.24TellurobismuthiteBi2Te3
3.7.25SoučekitePbCuBi(S,Se)3
3.7.26TsumoiteBiTe
3.7.27PilseniteBi4Te3
3.7.28HedleyiteBi7Te3
3.7.29TetradymiteBi2Te2S
3.7.30JoséiteBi4TeS2
3.7.31Joséite-BBi4Te2S
3.7.32IngoditeBi2TeS
3.7.33SulphotsumoiteBi3Te2S
3.7.34KawazuliteBi2Te2Se
3.7.36SkippeniteBi2TeSe2
3.7.37KochkaritePbBi4Te7
3.7.38Rucklidgeite(Bi,Pb)3Te4
3.7.39AleksitePbBi2Te2S2
3.7.40JunoiteCu2Pb3Bi8(S,Se)16

Other Names for Alacránite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Alacránite

Reference List:
American Mineralogist (1988): 73: 189.

Burns, P.C., and J.B. Percival(2001) Alacranite, As4S4: A New Occurrence, New Formula, and Determination of the Crystal Structure. Canadian Mineralogist: 39: 809-818.

Bonazzi, P., Bindi, L., Popova, V., Pratesi, G. & Menchetti, S. (2003): Alacranite, As8S9: Structural study of the holotype and re-assignment of the original chemical formula. American Mineralogist: 88: 1796-1800.

Mineralogical Record 39: 132.

Szakáll, S. (2006): Postmagmatic alacranite (?) from the Ciomadu area, south Harghita, Romania. Acta Mineralogica-Petrographica, Abstract Series 5, Szeged, 114. [http://www.mineral.hermuz.hu/acta_05/pdf/szakalls3.pdf]

Bonazzi, P. & Bindi, L. (2008): A crystallographic review of arsenic sulfides: Effects of chemical variations and changes induced by exposure to light. Zeitschrift für Kristallographie, 223, 132-147.

Internet Links for Alacránite

Localities for Alacránite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Bulgaria
 
  • Haskovo Oblast (Khaskovo Oblast)
    • Rhodope Mts
Miadenova, V. (2000). Alacranite and Duranusite from Mareshnitsa Occurrence, Eastern Rhodopes---New Minerals for Bulgaria. Comptes Rendus de l'Academie Bulgare des Sciences, 53(4), 67.
Chile
 
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
          • Alacrán
[Clark, 1993 - "Hey's Mineral Index, 3rd Edition"]
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
      • Kutná Hora (Kuttenberg)
        • Poličany
          • Vrchlice river valley
Pauliš P. Mineralogické lokality okolí Kutné Hory. Kuttna, Kutná Hora 1999. ISBN 80-902719-0-1.
    • Hradec Králové Region
      • Trutnov (Trautenau)
        • Radvanice
Žáček, V., Ondruš, P.: Mineralogy of recently formed sublimates from Kateřina colliery in Radvanice, Eastern Bohemia, Czech Republic. Bulletin of the Czech geological survey, 1998, vol. 73, no. 2, s. 289-302.
    • Karlovy Vary Region
      • Sokolov (Falkenau an der Eger)
Scharm B., Kuhn P., Kocián J.: Minerály arzénu v terciéru sokolovské pánve. In Nerostné surovinové zdroje, vědecká konference, sekce 2 - geologie, 1975, 62-67.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Alpirsbach
        • Reinerzau District
K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
      • Schenkenzell
        • Wittichen
          • Böckelsbach valley
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
          • Burgfelsen
No reference listed
          • Heubach Valley
No reference listed
  • North Rhine-Westphalia
    • Siegerland
      • Eisern
Wittern: "Mineralfundorte in Deutschland", 2001
  • Saxony
    • Dresden
      • Hänichen
Thalheim, K.; Reichel, W. & Witzke, T. (1991): Die Minerale des Döhlener Beckens.- Schriften des Staatlichen Museums für Mineralogie und Geologie zu Dresden, Nr. 3
      • Possendorf
  • Thuringia
    • Gera
      • Ronneburg U deposit
T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
Japan
 
  • Honshu Island
    • Kanto region
      • Gunma Prefecture
The Mineral Species of Japan (5th ed) Matsubara
Papua New Guinea
 
  • New Ireland Province
    • Lihir Island area
Can Min 39 (3), 2001, 809-818
Romania
 
  • Harghita Co.
Szakáll, S. (2006): Postmagmatic alacranite (?) from the Ciomadu area, south Harghita, Romania. Acta Mineralogica-Petrographica, Abstract Series 5, Szeged, 114. http://www.mineral.hermuz.hu/acta_05/pdf/szakalls3.pdf]; Kristály, F. & Szakáll, S. (2009): Mitt. Österr. Mineral. Ges. 155, 94. (Abs.)
Russia
 
  • Far-Eastern Region
    • Kamchatka Oblast'
ZVMO,(1986) 115, 360-368; Bonazzi, P., Bindi, L., Popova, V., Pratesi, G. & Menchetti, S. (2003): Alacranite, As8S9: Structural study of the holotype and re-assignment of the original chemical formula. American Mineralogist 88, 1796-1800.
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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