Duranusite Mineral Data

Duranusite Mineral Data +

General Duranusite Information

Chemical Formula:

As4S

Composition:

Molecular Weight = 331.75 gm

Arsenic 90.33 % As

Sulfur 9.67 % S

______

100.00 %

Empirical Formula:

As₄S

Environment:

Realgar has been altered by deuteric solutions to form the rare mineral duranusite,

IMA Status:

Approved IMA 1973

Locality:

Duranus, Alpes-Meritimes, France. Mina Capillitas, an epithermal deposit in the Province of Catamarca, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Duranusite Image

Images:

Duranusite Realgar

Comments: Small black Duranusite in orange-red realgar matrix.
Location: Duranus, Alpes-Maritimes, Provence-Alpes-C?te d'Azur, France. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Duranusite Crystallography

Axial Ratios:

a:b:c =0.529:1:1.4904

Cell Dimensions:

a = 3.576, b = 6.759, c = 10.074, Z = 2; V = 243.49 Den(Calc)= 4.52

Crystal System:

OrthorhombicSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.919(1), 5.037(0.9), 5.62(0.9),

Physical Properties of Duranusite

Color:

Red.

Density:

4.5

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

black

Optical Properties of Duranusite

RL Color:

Gray-white with a brownish tint and brownish red internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Duranusite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	39.00	42.00
420 nm	36.80	39.40
440 nm	34.60	36.80
460 nm	33.00	34.80
480 nm	32.10	33.60
500 nm	31.40	32.70
520 nm	30.80	32.20
540 nm	30.40	31.80
560 nm	30.00	31.50
580 nm	29.60	31.00
600 nm	29.10	30.60
620 nm	28.70	30.30
640 nm	28.40	30.00
660 nm	28.00	29.70
680 nm	27.60	29.30
700 nm	27.10	29.00

**Calculated Relative Intensity Colors of Duranusite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	300%
R₁
R₂

Calculated Properties of Duranusite

Electron Density:

r_electron=4.03 gm/cc
note: r_Duranusite=4.52 gm/cc.

Fermion Index

Fermion Index = 0.00072
Boson Index = 0.99928

Photoelectric:

PE_Duranusite= 65.88 barns/electron
U=PE_Duranusite x r_electron= 265.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Duranusite is Not Radioactive

Duranusite Classification

Dana Class:

2.1.4.1 (2)Sulfides - Including Selenides and Tellurides

(2.1)where Am Xp, with m:p>3:1

(2.1.4)Dana Group

2.1.4.1 Duranusite As4S Unk Ortho

Strunz Class:

II/F.02-10 II - Sulfides and sulphosalts

II/F - Sulfides with nonmetallic properties, Arsenic-Sulfides

II/F.02 - Duranusite - Jeromite series

II/F.02-10 Duranusite As4S Unk Ortho

II/F.02-20 Dimorphite As4S3 P nma 2/m 2/m 2/m

II/F.02-30 Realgar AsS P 2₁/n 2/m

II/F.02-40 Pararealgar AsS P 2₁/c 2/m

II/F.02-50 Alacranite As8S9 P 2/c 2/m

II/F.02-60 Uzonite As4S5 P 2₁/m 2/m

II/F.02-70 Orpiment As2S3 P 2₁/n 2/m

II/F.02-80 Laphamite As2(Se,S)3 P 2₁/n 2/m

II/F.02-90 Jeromite As(S,Se)2 None

Other Duranusite Information

References:

NAME( CanMin, 10/99) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Duranusite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Duranusite

As4S
Dana No: 2.1.4.1 Strunz No: II/F.02-10
Locality:

Notes: