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UM1970-18-S:As

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Formula:
As
 
4
S
 
4
System:MonoclinicColour:yellow


alpha-As4S4. Stable above 250 deg. C.

Classification of UM1970-18-S:As

IMA status:Unnamed - valid
Nickel-Strunz 10th (pending) edition ID:2.FA.15d

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
Dana 8th edition ID:2.8.21.3

2 : SULFIDES
8 : AmXp, with m:p = 1:1
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Type Occurrence of UM1970-18-S:As

Type Locality:Alacrán Mine, Alacrán, Pampa Larga district, Tierra Amarilla, Copiapó Province, Atacama Region, Chile

Physical Properties of UM1970-18-S:As

Lustre:Resinous
Colour:yellow
Density (measured):3.46 g/cm3
Density (calculated):3.46 g/cm3

Crystallography of UM1970-18-S:As

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Cell Parameters:a = 9.957Å, b = 9.335Å, c = 8.889Å
β = 102.48°
Ratio:a:b:c = 1.067 : 1 : 0.952
Unit Cell Volume:V 806.698 ų
Z:16
X-Ray Powder Diffraction:
d-spacingIntensity
5.75 (80)
5.01 (40)
3.93 (70)
3.20 (80)
3.08 (70)
3.01 (100)
2.89 (100)
2.82 (60)
(

Chemical Properties of UM1970-18-S:As

Formula:
As
 
4
S
 
4
All elements listed in formula:As, S

Relationship of UM1970-18-S:As to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.FA.05Duranusite
As
 
4
S
2.FA.10Dimorphite
As
 
4
S
 
3
2.FA.15bPararealgar
As
 
4
S
 
4
2.FA.15aRealgar
As
 
4
S
 
4
2.FA.15cUM1970-19-S:As
As
 
4
S
 
4
2.FA.20Alacránite
As
 
8
S
 
9
2.FA.25Uzonite
As
 
4
S
 
5
2.FA.30Laphamite
As
 
2
(Se,S)
 
3
2.FA.30Orpiment
As
 
2
S
 
3
2.FA.35Getchellite
AsSbS
 
3
2.FA.40Wakabayashilite
[(As,Sb)
 
6
S
 
9
][As
 
4
S
 
5
]

Other Names for UM1970-18-S:As

Synonyms:
High RealgarUM1970-18
Other Languages:

Other Information

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

References for UM1970-18-S:As

Reference List:

- +
American Mineralogist 55,1338(1970).

Canadian Mineralogist 11,520(1972)

Journal of the Chemical Society, Dalton Transactions (1972), 1347.

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    • Localities for UM1970-18-S:As

    The 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.
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    (TL) indicates type locality. ? 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.
    Chile
     
    • Atacama Region
      • Copiapó Province
        • Tierra Amarilla
          • Pampa Larga district
            • Alacrán
    		Amer. Min. 55,1338(1970)
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