Yuanjiangite Mineral Data

Yuanjiangite Mineral Data +

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General Yuanjiangite Information

Chemical Formula:

AuSn

Composition:

Molecular Weight = 315.68 gm

Tin 37.60 % Sn

Gold 62.40 % Au

______

100.00 %

Empirical Formula:

AuSn

Environment:

Placer deposit.

IMA Status:

Approved IMA 1994

Locality:

In sandy gravel in the middle course of the Yuanjiang River, near the town of Yuanlin, Hunan Province, Peoples Republic of China. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 56262

IMA1993-028

PDF 8-463

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Yuanjiangite Crystallography

Axial Ratios:

a:c = 1:1.27664

Cell Dimensions:

a = 4.316, c = 5.51, Z = 2; V = 88.89 Den(Calc)= 11.79

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.218(1), 2.159(0.57), 3.087(0.38),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, Note: ideal nickel arsenide structure

Physical Properties of Yuanjiangite

Cleavage:

None

Color:

Silver white.

Density:

11.7 - 11.9, Average = 11.8

Diaphaniety:

Opaque

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Metallic

Streak:

black

Optical Properties of Yuanjiangite

RL Anisotrophism:

Clear, light yellow with brown tint.

RL Bireflectance:

Faint.

RL Color:

White with a light yellow tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Yuanjiangite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
480 nm	67.10	66.70
540 nm	76.10	74.30
580 nm	79.90	77.40
660 nm	83.10	79.60

**Calculated Relative Intensity Colors of Yuanjiangite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%
R₁
R₂

Calculated Properties of Yuanjiangite

Electron Density:

r_electron=9.64 gm/cc
note: r_Yuanjiangite=11.8 gm/cc.

Fermion Index

Fermion Index = 0.06249
Boson Index = 0.93751

Photoelectric:

PE_Yuanjiangite=1,165.22 barns/electron
U=PE_Yuanjiangite x r_electron=11227.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Yuanjiangite is Not Radioactive

Yuanjiangite Classification

Dana Class:

1.1.2.3 (1)Native Elements

(1.1)with metallic elements other than the platinum group

(1.1.2)Dana Group

1.1.2.1 Auricupride Cu3Au P m3m 4/m 3 2/m

1.1.2.2 Tetra-auricupride AuCu P 4/mmm 4/m 2/m 2/m

1.1.2.3 Yuanjiangite AuSn P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

II/C.20-75 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.20 - Nickeline group and related compounds, Polarite - Cherepanovite series

II/C.20-05 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-10 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

II/C.20-20 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

II/C.20-30 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

II/C.20-40 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-50 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-70 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-75 Yuanjiangite AuSn P 6₃/mmc 6/m 2/m 2/m

II/C.20-80 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-90 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

II/C.20-95 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-100 Polarite Pd(Bi,Pb) Ccm21 mm2

II/C.20-110 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

II/C.20-120 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

II/C.20-130 Cherepanovite RhAs P nma 2/m 2/m 2/m

Other Yuanjiangite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p1330,1995) OPTIC PROP.(MinRec, v 27, p 395)

See Also:

Links to other databases for Yuanjiangite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

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Yuanjiangite

AuSn
Dana No: 1.1.2.3 Strunz No: II/C.20-75
Locality:

Notes: