Mineralogy Database

Matildite Mineral Data

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General Matildite Information

Help on Chemical  Formula: Chemical Formula: AgBiS2
Help on Composition: Composition: Molecular Weight = 380.98 gm
   Silver   28.31 %  Ag
   Bismuth  54.85 %  Bi
   Sulfur   16.83 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: AgBiS2
Help on Environment: Environment: Moderate to high temperature hydrothermal deposts and in pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1883
Help on Locality: Locality: Matilda mine, near Moroccha, Provinence Junin, Peru. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality
Help on Name Pronunciation: Name Pronunciation: Matildite + Pronunciation Say MATILDITE
Help on Synonym: Synonym: Beegerite - mixture of schirmerite and matildite
  ICSD 44340
  PDF 24-1031

Matildite Image

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Comments: Gray platy metallic crystalline matildite in white quartz.
Location: Sullivan Mountain, Montezuma District, Summit County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Matildite   Bismuth   Bismuthinite

Comments: SEM image of native Bi replaced by bismuthinite and matildite. Black areas represent gangue minerals. (CanMin, v43:899).
Location: Uranium deposit at Niederschlema-Alberoda, Germany. Scale: See Image.
© Canadian Mineralogist

Matildite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:4.66256
Help on Cell Dimensions: Cell Dimensions: a = 4.066, c = 18.958, Z = 3; V = 271.43 Den(Calc)= 6.99
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.827(1), 3.3(0.8), 2.03(0.6),

Physical Properties of Matildite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray, Iron black.
Help on Density: Density: 6.9
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light gray

Optical Properties of Matildite

Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Color: RL Color: White.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Matildite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   41.40   47.20 
 420 nm   41.90   47.80 
 440 nm   42.20   48.30 
 460 nm   43.10   48.80 
 480 nm   43.40   49.30 
 500 nm   43.40   49.30 
 520 nm   43.00   49.00 
 540 nm   42.80   48.40 
 560 nm   42.50   47.80 
 580 nm   42.20   47.30 
 600 nm   41.70   46.90 
 620 nm   41.30   46.70 
 640 nm   40.80   46.70 
 660 nm   40.30   46.70 
 680 nm   39.90   46.30 
 700 nm   39.30   46.10 
Calculated Relative Intensity Colors of Matildite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 220%

Calculated Properties of Matildite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.94 gm/cc
note: Specific Gravity of Matildite =6.99 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0012630538
Boson Index = 0.9987369462
Help on Photoelectric: Photoelectric: PEMatildite =1,114.91 barns/electron
U=PEMatildite x rElectron Density=6,627.63 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Matildite is Not Radioactive

Matildite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.01)Matildite Group Matildite AgBiS2 P 3m1 3 2/m Bohdanowiczite AgBiSe2 P 3m1 3 2/m Volynskite AgBiTe2 P 3m1 3 2/m Zlatogorite! CuNiSb2 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 02.JA.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.J - Sulfosalts of PbS Archetype
  02.JA -Galena derivatives with little or no Pb
02.JA.20 Bohdanowiczite AgBiSe2 P 3m1 3 2/m
02.JA.20 Matildite AgBiS2 P 3m1 3 2/m
02.JA.20 Volynskite AgBiTe2 P 3m1 3 2/m

Other Matildite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Matildite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.JA.20





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