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Mckinstryite Mineral Data
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General Mckinstryite Information
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 Chemical Formula: |
(Ag,Cu)2S |
| Composition: |
Molecular Weight = 212.34 gm |
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Copper 23.94 % Cu |
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Silver 60.96 % Ag |
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Sulfur 15.10 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag1.2Cu0.8S |
| Environment: |
Low temperature mineral in silver deposits. |
| IMA Status: |
Approved IMA 1966 |
| Locality: |
Foster mine, Cobalt, Ontario, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Hugh E. McKinstry (1896-1961), U. S. Economic geologist. |
| Name Pronunciation: |
Mckinstryite + Pronunciation  |
| Synonym: |
IMA1966-012 |
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Mckinstryite Image |
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Images:
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Mckinstryite Crystallography
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| Axial Ratios: |
a:b:c =0.8957:1:0.4977 |
| Cell Dimensions: |
a = 14.043, b = 15.677, c = 7.803, Z = 32; V = 1,717.85 Den(Calc)= 6.57 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam |
| X Ray Diffraction: |
By Intensity(I/Io): 2.606(1), 2.07(0.7), 3.508(0.6), |
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Physical Properties of Mckinstryite
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| Cleavage: |
{???} Indistinct |
| Color: |
Dark gray, Black, Steel gray. |
| Density: |
6.61 |
| Diaphaneity: |
Opaque |
| Fracture: |
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
1.5-2.5 - Hardness very near Gypsum |
| Luster: |
Metallic |
| Streak: |
dark gray |
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Optical Properties of Mckinstryite
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| RL Anisotrophism: |
Strong, in gray, pale grayish blue and light tan. |
| RL Color: |
Light grayish white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Mckinstryite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
24.90 |
31.40 |
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| 420 nm |
25.30 |
31.10 |
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| 440 nm |
25.70 |
30.80 |
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| 460 nm |
25.70 |
30.40 |
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| 480 nm |
25.40 |
29.80 |
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| 500 nm |
25.00 |
29.10 |
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| 520 nm |
24.30 |
28.40 |
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| 540 nm |
24.00 |
27.90 |
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| 560 nm |
23.50 |
27.40 |
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| 580 nm |
23.30 |
27.10 |
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| 600 nm |
23.20 |
26.90 |
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| 620 nm |
23.00 |
26.60 |
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| 640 nm |
23.00 |
26.40 |
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| 660 nm |
23.00 |
26.10 |
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| 680 nm |
23.00 |
25.90 |
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| 700 nm |
22.90 |
25.80 |
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Calculated Relative Intensity Colors of Mckinstryite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
380% |
| R1 |
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| R2 |
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Calculated Properties of Mckinstryite
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| Electron Density: |
Bulk Density (Electron Density)=5.92 gm/cc
note: Specific Gravity of Mckinstryite =6.57 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0011325692
Boson Index = 0.9988674308 |
| Photoelectric: |
PEMckinstryite = 166.34 barns/electron
U=PEMckinstryite x rElectron Density= 984.06 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mckinstryite is Not Radioactive |
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Mckinstryite Classification
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| Dana Class: |
02.04.05.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.04)where Am Bn Xp, with (m+n):p=2:1 |
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(02.04.05)Dana Group |
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02.04.05.01 Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m |
| Strunz Class: |
02.BA.25b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BA -With Cu, Ag, Au |
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02.BA.25b Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m |
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Other Mckinstryite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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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Print or Cut-and-Paste your Mckinstryite Specimen Label here :
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Mckinstryite
(Ag,Cu)2S
Dana No: 02.04.05.01 Strunz No: 02.BA.25b
Locality:
Notes:
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