Paakkonenite Mineral Data

Paakkonenite Mineral Data +

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General Paakkonenite Information

Chemical Formula:

Sb2AsS2

Composition:

Molecular Weight = 382.55 gm

Antimony 63.65 % Sb

Arsenic 19.58 % As

Sulfur 16.76 % S

______

100.00 %

Empirical Formula:

Sb₂AsS₂

IMA Status:

Approved IMA 1981

Locality:

Kalliosalo deposit, Seinajoki region, Finland. Link to MinDat.org Location Data.

Name Origin:

Named for Viekko Paakkonen, who studied the ore deposits of the region.

Paakkonenite Image

Images:

Click Here for Larger Paakkonenite Image

Paakkonenite Kermesite

Comments: Much of the matrix is the gray metallic paakkonenite with red crystals of kermesite and minute yellow crystals of valentinite.
Location: Cai' ao mine, Danfong Co., Shaanxi Prov., China. Scale: 3x2x2cm.
© Tom Loomis / Dakota Matrix

Paakkonenite Crystallography

Axial Ratios:

a:b:c =2.7153:1:3.1548

Cell Dimensions:

a = 10.75, b = 3.959, c = 12.49, Z = 4; beta = 115.25° V = 480.78 Den(Calc)= 5.28

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.87(1), 2.68(0.6), 3.13(0.4),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
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Help on Above

Bonazzi P , Borrini D , Mazzi F , Olmi F , American Mineralogist , 80 (1995) p.1054-1058, Crystal structure and twinning of Sb2AsS2, the synthetic analogue of, paakkonenite

Physical Properties of Paakkonenite

Color:

Gray.

Density:

5.21

Diaphaniety:

Opaque

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

brownish gray

Optical Properties of Paakkonenite

RL Anisotrophism:

Strong.

RL Color:

Light pale gray with bright red internam reflections.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Paakkonenite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
440 nm	40.90	52.10
460 nm	39.80	51.70
480 nm	38.70	50.80
500 nm	38.00	49.80
520 nm	37.50	48.70
540 nm	37.20	47.80
560 nm	36.90	47.00
580 nm	36.70	46.30
600 nm	36.50	45.80
620 nm	36.50	45.50
640 nm	36.40	45.30
660 nm	36.20	45.10
680 nm	36.20	45.40
700 nm	36.00	45.30

**Calculated Relative Intensity Colors of Paakkonenite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%
R₁
R₂

Calculated Properties of Paakkonenite

Electron Density:

r_electron=4.61 gm/cc
note: r_Paakkonenite=5.28 gm/cc.

Fermion Index

Fermion Index = 0.00125
Boson Index = 0.99875

Photoelectric:

PE_Paakkonenite= 229.83 barns/electron
U=PE_Paakkonenite x r_electron=1,059.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Paakkonenite is Not Radioactive

Paakkonenite Classification

Dana Class:

2.11.5.1 (2)Sulfides - Including Selenides and Tellurides

(2.11)where Am Bn Xp, with (m+n):p=2:3

(2.11.5)Dana Group

2.11.5.1 Paakkonenite Sb2AsS2 C 2/m 2/m

Strunz Class:

II/D.08-10 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.08 - Stibnite - Bismuthinite series

II/D.08-10 Paakkonenite Sb2AsS2 C 2/m 2/m

II/D.08-20 Stibnite Sb2S3 Pbnm 2/m 2/m 2/m

II/D.08-25 Antimonselite Sb2Se3 Pbnm 2/m 2/m 2/m

II/D.08-30 Metastibnite Sb2S3 None

II/D.08-40 Bismuthinite Bi2S3 Pbnm 2/m 2/m 2/m

II/D.08-50 Guanajuatite Bi2Se3 Pbnm 2/m 2/m 2/m

II/D.08-60 Ottemannite Sn2S3 Pnam 2/m 2/m 2/m

Other Paakkonenite Information

References:

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

See Also:

Links to other databases for Paakkonenite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Paakkonenite

Sb2AsS2
Dana No: 2.11.5.1 Strunz No: II/D.08-10
Locality:

Notes: