Yuanjiangite Mineral Data

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.

Name Pronunciation:

Yuanjiangite + Pronunciation

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

Diaphaneity:

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:

Bulk Density (Electron Density)=9.64 gm/cc
note: Specific Gravity of Yuanjiangite =11.8 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Yuanjiangite is Not Radioactive

Yuanjiangite Classification

Dana Class:

01.01.02.03 (01)Native Elements

(01.01)with metallic elements other than the platinum group

(01.01.02)Auricupride Group

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

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

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

Strunz Class:

01.AC.15 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.A - Metals and Intermetallic Alloys

01.AC -Indium-tin family

01.AC.15 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

01.AC.15 Yuanjiangite AuSn P 6₃/mmc 6/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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Yuanjiangite Specimen Label here :

Yuanjiangite

AuSn
Dana No: 01.01.02.03 Strunz No: 01.AC.15
Locality:

Notes: