Mckinstryite Mineral Data

General Mckinstryite Information

Chemical Formula:

(Ag,Cu)2S

Composition:

Molecular Weight = 212.34 gm

Copper 23.94 % Cu

Silver 60.96 % Ag

Sulfur 15.10 % S

______

100.00 %

Empirical Formula:

Ag_1.2Cu_0.8S

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

Mckinstryite Image

Images:

Click Here for Larger Mckinstryite Image

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

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

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

By Intensity(I/I_o): 2.606(1), 2.07(0.7), 3.508(0.6),

Physical Properties of Mckinstryite

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

Optical Properties of Mckinstryite

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	∑ 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**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	380%
R₁
R₂

Calculated Properties of Mckinstryite

Electron Density:

Bulk Density (Electron Density)=5.92 gm/cc
note: Specific Gravity of Mckinstryite =6.57 gm/cc.

Fermion Index:

Fermion Index = 0.0011325692
Boson Index = 0.9988674308

Photoelectric:

PE_Mckinstryite= 166.34 barns/electron
U=PE_Mckinstryite x rElectron Density= 984.06 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mckinstryite is Not Radioactive

Mckinstryite Classification

Dana Class:

02.04.05.01 (02)Sulfides - Including Selenides and Tellurides

(02.04)where Am Bn Xp, with (m+n):p=2:1

(02.04.05)Dana Group

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

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

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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Ask about Mckinstryite here :
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Print or Cut-and-Paste your Mckinstryite Specimen Label here :

Mckinstryite

(Ag,Cu)2S
Dana No: 02.04.05.01 Strunz No: 02.BA.25b
Locality:

Notes: