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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
Approval Year:
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

Occurrences of Alacránite

Type Occurrence of Alacránite

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

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
Elements listed in formula:

Relationship of Alacránite to other Species

Series:
Forms a series with Bonazziite (see here)
2.FA.AnorpimentAs2S3
2.FA.05DuranusiteAs4S
2.FA.10DimorphiteAs4S3
2.FA.15bPararealgarAs4S4
2.FA.15aRealgarAsS
2.FA.15dUM1970-18-S:AsAs4S4
2.FA.25UzoniteAs4S5
2.FA.30LaphamiteAs2Se3
2.FA.30OrpimentAs2S3
2.FA.35GetchelliteSbAsS3
2.FA.40Wakabayashilite(As,Sb)6As4S14
3.7.1PatróniteVS4
3.7.2DuranusiteAs4S
3.7.3DimorphiteAs4S3
3.7.4RealgarAsS
3.7.5PararealgarAs4S4
3.7.7UzoniteAs4S5
3.7.8OrpimentAs2S3
3.7.9Jeromite
3.7.10LaphamiteAs2Se3
3.7.11GetchelliteSbAsS3
3.7.12Wakabayashilite(As,Sb)6As4S14
3.7.13PääkköneniteSb2AsS2
3.7.14StibniteSb2S3
3.7.15MetastibniteSb2S3
3.7.16TellurantimonySb2Te3
3.7.17BismuthiniteBi2S3
3.7.18NevskiteBi(Se,S)
3.7.19GuanajuatiteBi2Se3
3.7.21IkunoliteBi4S3
3.7.22LaitakariteBi4Se3
3.7.23PoubaitePbBi2(Se,Te,S)4
3.7.24TellurobismuthiteBi2Te3
3.7.25SoučekiteCuPbBi(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
3.7.36SkippeniteBi2Se2Te
3.7.37KochkaritePbBi4Te7
3.7.38RucklidgeitePbBi2Te4
3.7.39AleksitePbBi2Te2S2
3.7.40JunoiteCu2Pb3Bi8S16

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:
Popova, V.I., Popov, V.A., Clark, A., Polyakov, V.O., Borisovskii, S.E. (1986) Alacránite, As8S9–a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 115(3): 360-368.

Hawthorne, F.C., Burke, E.A.J., Ercit, T.S., Grew, E.S., Grice, J.D., Jambor, J.L., Puziewicz, J., Roberts, A.C., Vanko, D.A. (1988) New mineral names. American Mineralogist: 73: 189.

Burns, P.C., Percival, J.B. (2001) Alacranite, As4S4: A new occurrence, new formula, and determination of the crystal structure. The 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.

Pratesi, G., Zoppi, M. (2015) An insight into the inverse transformation of realgar altered by light. American Mineralogist: 100: 1222-1229.

Internet Links for Alacránite

mindat.org URL:
http://www.mindat.org/min-91.html
Please feel free to link to this page.

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 (TL)
 
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
          • Alacrán
Clark, A.H. (1970): Alpha-arsenic sulfide, from Mina Alacrán, Pampa Larga, Chile. Am. Mineral. 55, 1338-1344; [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; 松原聰, & 宮脇律郎. (2005). 群馬県西ノ牧鉱山産パラ鶏冠石とアラクラン石. Bulletin of the National Science Museum. Series C, Geology & paleontology, 31, 1-6.
Kyrgyzstan
 
  • Osh Oblast
    • Alai Range (Alay Range)
      • Fergana Valley
Bindi, L., Pratesi, G., Muniz-Miranda, M., Zoppi, M., Chelazzi, L., Lepore, G. O., & Menchetti, S. (2015). From ancient pigments to modern optoelectronic applications of arsenic sulfides: bonazziite, the natural analogue of β-As4S4 from Khaidarkan deposit, Kyrgyzstan. Mineralogical Magazine, 79(1), 121-131.
Papua New Guinea
 
  • New Ireland Province
    • Lihir Island area
Can Min 39 (3), 2001, 809-818; Petersen, S., Herzig, P. M., Hannington, M. D., Jonasson, I. R., & Arribas, A. (2002). Submarine gold mineralization near Lihir Island, New Ireland fore-arc, Papua New Guinea. Economic Geology, 97(8), 1795-1813.
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 (TL)
 
  • 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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