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Alacránite

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Formula:
As8S9
Colour:
Orange to pale gray with rose-yellow internal reflections
Lustre:
Vitreous, Resinous, Greasy
Hardness:
Specific Gravity:
3.43
Crystal System:
Monoclinic
Name:
Named after its discovery locality in Chile.
Different from (unnamed) natural beta-As4S4.


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Classification of AlacrániteHide

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

Physical Properties of AlacrániteHide

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

Optical Data of AlacrániteHide

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 AlacrániteHide

Formula:
As8S9

Crystallography of AlacrániteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/c
Cell Parameters:
a = 9.942 Å, b = 9.601 Å, c = 9.178 Å
β = 101.94°
Ratio:
a:b:c = 1.036 : 1 : 0.956
Unit Cell 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 DiffractionHide

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).

Type Occurrence of AlacrániteHide

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
Associated Minerals at Type Locality:

Synonyms of AlacrániteHide

Other Language Names for AlacrániteHide

Relationship of Alacránite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Orpiment3 photos of Alacránite associated with Orpiment on mindat.org.
Uzonite2 photos of Alacránite associated with Uzonite on mindat.org.
Realgar1 photo of Alacránite associated with Realgar on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.FA.AnorpimentAs2S3Tric. 1 : P1
2.FA.BonazziiteAs4S4Mon. 2/m : B2/b
2.FA.05DuranusiteAs4SOrth. mmm (2/m 2/m 2/m) : Pmna
2.FA.10DimorphiteAs4S3Orth. mmm (2/m 2/m 2/m) : Pnma
2.FA.15bPararealgarAs4S4Mon. 2/m : P21/b
2.FA.15aRealgarAs4S4Mon. 2/m
2.FA.15dUM1970-18-S:AsAs4S4Mon. 2/m : B2/b
2.FA.25UzoniteAs4S5Mon.
2.FA.30LaphamiteAs2(Se,S)3Mon. 2/m
2.FA.30OrpimentAs2S3Mon. 2/m
2.FA.35GetchelliteAsSbS3Mon. 2/m : P21/b
2.FA.40Wakabayashilite[(As,Sb)6S9][As4S5]Orth. mm2 : Pna21

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.7.1PatróniteVS4Mon.
3.7.2DuranusiteAs4SOrth. mmm (2/m 2/m 2/m) : Pmna
3.7.3DimorphiteAs4S3Orth. mmm (2/m 2/m 2/m) : Pnma
3.7.4RealgarAs4S4Mon. 2/m
3.7.5PararealgarAs4S4Mon. 2/m : P21/b
3.7.7UzoniteAs4S5Mon.
3.7.8OrpimentAs2S3Mon. 2/m
3.7.9JeromiteAmor.
3.7.10LaphamiteAs2(Se,S)3Mon. 2/m
3.7.11GetchelliteAsSbS3Mon. 2/m : P21/b
3.7.12Wakabayashilite[(As,Sb)6S9][As4S5]Orth. mm2 : Pna21
3.7.13PääkköneniteSb2AsS2Mon. 2/m : B2/m
3.7.14StibniteSb2S3Orth. mmm (2/m 2/m 2/m)
3.7.15MetastibniteSb2S3Amor.
3.7.16TellurantimonySb2Te3Trig.
3.7.17BismuthiniteBi2S3Orth. mmm (2/m 2/m 2/m)
3.7.18NevskiteBi(Se,S)Trig.
3.7.19GuanajuatiteBi2Se3Orth. mmm (2/m 2/m 2/m) : Pnma
3.7.21IkunoliteBi4(S,Se)3Trig.
3.7.22LaitakariteBi4Se2STrig. 3m : R3m
3.7.23PoubaitePbBi2(Se,Te,S)4Trig.
3.7.24TellurobismuthiteBi2Te3Trig.
3.7.25SoučekitePbCuBi(S,Se)3Orth.
3.7.26TsumoiteBiTeTrig. 3m (3 2/m) : P3 1m
3.7.27PilseniteBi4Te3Trig. 3m (3 2/m) : R3m
3.7.28HedleyiteBi7Te3Trig. 3m (3 2/m) : R3m
3.7.29TetradymiteBi2Te2STrig. 3m (3 2/m) : R3m
3.7.30JoséiteBi4TeS2Trig. 3m (3 2/m) : R3m
3.7.31Joséite-BBi4Te2STrig.
3.7.32IngoditeBi2TeSTrig.
3.7.33SulphotsumoiteBi3Te2STrig.
3.7.34KawazuliteBi2Te2SeTrig.
3.7.36SkippeniteBi2TeSe2Trig.
3.7.37KochkaritePbBi4Te7Trig.
3.7.38RucklidgeitePbBi2Te4Trig.
3.7.39AleksitePbBi2Te2S2Trig.
3.7.40JunoiteCu2Pb3Bi8(S,Se)16Mon. 2/m : B2/m

Other InformationHide

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 AlacrániteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 AlacrániteHide

Localities for AlacrániteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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
      • Weida
        • Berga/Elster
          • Culmitzsch
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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