Andorite Mineral Data

Andorite Mineral Data +

General Andorite Information

Chemical Formula:

PbAgSb3S6

Composition:

Molecular Weight = 872.71 gm

Silver 12.36 % Ag

Antimony 41.85 % Sb

Lead 23.74 % Pb

Sulfur 22.05 % S

______

100.00 %

Empirical Formula:

PbAgSb₃S₆

Environment:

Of hydrothermal origin.

IMA Status:

Valid Species (Pre-IMA) 1894

Locality:

In the USA, at the Keyser mine, Morey district, Nye Co., Nevada; in the Thompson mine, Darwin district, Inyo Co., California; and at Bear Basin, King Co., Washington. From near Takla L Link to MinDat.org Location Data.

Name Origin:

For Andor von Semsey (1833-1923), a Hungarian nobleman, who was also an amateur mineralogist.

Synonym:

ICSD 20818

PDF 35-596

Andorite Image

Images:

Andorite

Comments: Metallic, prismatic andorite crystal.
Location: Baie Sprie (Felsobanya), Maramures, Romania. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Andorite Ferrokesterite

Comments: Small, tetragonal crystal of gray ferrokesterite (circled in thumbnail) attached on the surface of a larger striated andorite specimen.
Location: San Jose mine, Oruro, Bolivia. Scale: Crystal size 0.2 mm.
© John Veevaert

Andorite Crystallography

Axial Ratios:

a:b:c =0.6779:1:0.2225

Cell Dimensions:

a = 13.01, b = 19.19, c = 4.27, Z = 4; V = 1,066.06 Den(Calc)= 5.44

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmma

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

By Intensity(I/I_o): 3.3(1), 2.9(0.8), 3.45(0.4),

Forms:

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Forms: [ 1 0 1] [ 0 1 0] [ 0 3 1] [ 1 1 1] [ 2 2 1] [ 1 1 0] [ 1 0 0] [ 1 1 2] [ 0 2 1] [ 0 1 1]

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Crystal Structure:

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Kawada I , Hellner E , Neues Jahrbuch fur Mineralogie, Monatshefte , 1971 (1971) p.551-560, Die kristallstruktur der pseudozelle (sub cell) von andorit VI (ramdohrit)

Physical Properties of Andorite

Cleavage:

None

Color:

Grayish yellow, Dark gray, Steel gray.

Density:

5.38 - 5.44, Average = 5.41

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

black

Optical Properties of Andorite

RL Color:

White.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Andorite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	39.20	42.30
420 nm	38.80	42.00
440 nm	38.40	41.70
460 nm	38.00	41.40
480 nm	37.50	41.10
500 nm	37.00	40.90
520 nm	36.70	40.60
540 nm	36.30	40.40
560 nm	36.00	40.00
580 nm	35.50	39.60
600 nm	35.20	39.00
620 nm	34.80	38.50
640 nm	34.50	38.00
660 nm	34.10	37.50
680 nm	33.70	37.00
700 nm	33.30	36.60

**Calculated Relative Intensity Colors of Andorite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	250%
R₁
R₂

Calculated Properties of Andorite

Electron Density:

r_electron=4.71 gm/cc
note: r_Andorite=5.44 gm/cc.

Fermion Index

Fermion Index = 0.05412
Boson Index = 0.94588

Photoelectric:

PE_Andorite= 596.64 barns/electron
U=PE_Andorite x r_electron=2,811.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Andorite is Not Radioactive

Andorite Classification

Dana Class:

3.4.15.4 (3)Sulfides - Sulfosalts

(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.4.15)Lillianite Group (Orthorhombic, AmBnS6 where A=Pb, Ag, Mn and B=Sb, Bi)

3.4.15.1 Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

3.4.15.2 Bursaite Pb5Bi4S11 Bbmm 2/m 2/m 2/m

3.4.15.3 Gustavite PbAgBi3S6(?) Bbmm 2/m 2/m 2/m

3.4.15.4 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

3.4.15.5 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

3.4.15.6 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

3.4.15.7 Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m

3.4.15.8 Fizelyite Pb14Ag5Sb21S48(?) P 2₁/n 2/m

Strunz Class:

II/E.23-40 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Complex Lead-Sulfosalts (Pb-Fe/Mn, Pb-Ag), with predominant Antimon x = 2.3 - 2.0

II/E.23 - Uchucchacuaite - Roshchinite series

II/E.23-10 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

II/E.23-20 Fizelyite Pb14Ag5Sb21S48(?) P 2₁/n 2/m

II/E.23-30 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

II/E.23-40 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

II/E.23-50 Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m

Other Andorite Information

References:

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

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Andorite

PbAgSb3S6
Dana No: 3.4.15.4 Strunz No: II/E.23-40
Locality:

Notes: