Mineralogy Database

Mckinstryite Mineral Data

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General Mckinstryite Information

Help on Chemical  Formula: Chemical Formula: (Ag,Cu)2S
Help on Composition: Composition: Molecular Weight = 212.34 gm
   Copper  23.94 %  Cu
   Silver  60.96 %  Ag
   Sulfur  15.10 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: Ag1.2Cu0.8S
Help on Environment: Environment: Low temperature mineral in silver deposits.
Help on IMA Status: IMA Status: Approved IMA 1966
Help on Locality: Locality: Foster mine, Cobalt, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Hugh E. McKinstry (1896-1961), U. S. Economic geologist.
Help on Name Pronunciation: Name Pronunciation: Mckinstryite + Pronunciation Say MCKINSTRYITE
Help on Synonym: Synonym: IMA1966-012

Mckinstryite Image

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  Mckinstryite   Silver

Comments: Black metallic massive mckinstryite with wire silver.
Location: Peregrina Mine, Guanajuato, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mckinstryite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8957:1:0.4977
Help on Cell Dimensions: Cell Dimensions: a = 14.043, b = 15.677, c = 7.803, Z = 32; V = 1,717.85 Den(Calc)= 6.57
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.606(1), 2.07(0.7), 3.508(0.6),

Physical Properties of Mckinstryite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Dark gray, Black, Steel gray.
Help on Density: Density: 6.61
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 1.5-2.5 - Hardness very near Gypsum
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray

Optical Properties of Mckinstryite

Help on RL Anisotrophism: RL Anisotrophism: Strong, in gray, pale grayish blue and light tan.
Help on RL Color: RL Color: Light grayish white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Mckinstryite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   24.90   31.40 
 420 nm   25.30   31.10 
 440 nm   25.70   30.80 
 460 nm   25.70   30.40 
 480 nm   25.40   29.80 
 500 nm   25.00   29.10 
 520 nm   24.30   28.40 
 540 nm   24.00   27.90 
 560 nm   23.50   27.40 
 580 nm   23.30   27.10 
 600 nm   23.20   26.90 
 620 nm   23.00   26.60 
 640 nm   23.00   26.40 
 660 nm   23.00   26.10 
 680 nm   23.00   25.90 
 700 nm   22.90   25.80 
Calculated Relative Intensity Colors of Mckinstryite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360% 380%

Calculated Properties of Mckinstryite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.92 gm/cc
note: Specific Gravity of Mckinstryite =6.57 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0011325692
Boson Index = 0.9988674308
Help on Photoelectric: Photoelectric: PEMckinstryite = 166.34 barns/electron
U=PEMckinstryite x rElectron Density= 984.06 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mckinstryite is Not Radioactive

Mckinstryite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.05)Dana Group Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.BA.25b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BA -With Cu, Ag, Au
02.BA.25b Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m

Other Mckinstryite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Mckinstryite :
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.BA.25b





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