General Andorite Information
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Chemical Formula: |
PbAgSb3S6 |
Composition: |
Molecular Weight = 872.71 gm |
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Silver 12.36 % Ag |
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Antimony 41.85 % Sb |
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Lead 23.74 % Pb |
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Sulfur 22.05 % S |
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______ |
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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 |
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PDF 35-596 |
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Andorite Image |
Images:
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Images:
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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 |
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Andorite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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)
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Physical Properties of Andorite
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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 |
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Optical Properties of Andorite
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RL Color: |
White. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Andorite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
39.20 |
42.30 |

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| 420 nm |
38.80 |
42.00 |

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| 440 nm |
38.40 |
41.70 |

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| 460 nm |
38.00 |
41.40 |

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| 480 nm |
37.50 |
41.10 |

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| 500 nm |
37.00 |
40.90 |

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| 520 nm |
36.70 |
40.60 |

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| 540 nm |
36.30 |
40.40 |

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| 560 nm |
36.00 |
40.00 |

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| 580 nm |
35.50 |
39.60 |

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| 600 nm |
35.20 |
39.00 |

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| 620 nm |
34.80 |
38.50 |

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| 640 nm |
34.50 |
38.00 |

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| 660 nm |
34.10 |
37.50 |

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| 680 nm |
33.70 |
37.00 |

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| 700 nm |
33.30 |
36.60 |

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Calculated Relative Intensity Colors of Andorite in Air
Relative Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
250% |
| R1 |
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| R2 |
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Calculated Properties of Andorite
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Electron Density: |
relectron=4.71 gm/cc note: rAndorite =5.44 gm/cc. |
Fermion Index |
Fermion Index = 0.05412 Boson Index = 0.94588 |
Photoelectric: |
PEAndorite = 596.64 barns/electron U=PEAndorite x relectron=2,811.66 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Andorite is Not Radioactive |
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Andorite Classification
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Dana Class: |
3.4.15.4 (3)Sulfides - Sulfosalts |
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(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(3.4.15)Lillianite Group (Orthorhombic, AmBnS6 where A=Pb, Ag, Mn and B=Sb, Bi) |
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3.4.15.1 Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m |
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3.4.15.2 Bursaite Pb5Bi4S11 Bbmm 2/m 2/m 2/m |
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3.4.15.3 Gustavite PbAgBi3S6(?) Bbmm 2/m 2/m 2/m |
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3.4.15.4 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m |
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3.4.15.5 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m |
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3.4.15.6 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m |
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3.4.15.7 Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m |
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3.4.15.8 Fizelyite Pb14Ag5Sb21S48(?) P 21/n 2/m |
Strunz Class: |
II/E.23-40 II - Sulfides and sulphosalts |
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II/E - Sulfosalts (S : As,Sb,Bi = x) Complex Lead-Sulfosalts (Pb-Fe/Mn, Pb-Ag), with predominant Antimon x = 2.3 - 2.0 |
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II/E.23 - Uchucchacuaite - Roshchinite series |
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II/E.23-10 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m |
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II/E.23-20 Fizelyite Pb14Ag5Sb21S48(?) P 21/n 2/m |
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II/E.23-30 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m |
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II/E.23-40 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m |
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II/E.23-50 Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m |
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Other Andorite Information
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References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Andorite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 - HyperPhysics
9 -MinDAT
10 -MinMax(Deutsch)
11 -MinMax(English)
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 - WWW-MINCRYST
15 -École des Mines de Paris
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Print or Cut-and-Paste your Andorite Specimen Label here :
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Andorite
PbAgSb3S6
Dana No: 3.4.15.4 Strunz No: II/E.23-40
Locality:
Notes:
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