Mckinstryite Mineral Data

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.

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

Diaphaniety:

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:

r_electron=5.92 gm/cc
note: r_Mckinstryite=6.57 gm/cc.

Fermion Index

Fermion Index = 0.00113
Boson Index = 0.99887

Photoelectric:

PE_Mckinstryite= 166.34 barns/electron
U=PE_Mckinstryite x r_electron= 984.06 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mckinstryite is Not Radioactive

Mckinstryite Classification

Dana Class:

2.4.5.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.4.5)Dana Group

2.4.5.1 Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m

Strunz Class:

II/B.06-20 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold

II/B.06 - Jalpaite - Imiterite series

II/B.06-10 Jalpaite Ag3CuS2 I 4₁/amd 4/m 2/m 2/m

II/B.06-20 Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m

II/B.06-30 Stromeyerite AgCuS C mcm 2/m 2/m 2/m

II/B.06-40 Eucairite CuAgSe Pmmn 2/m 2/m 2/m

II/B.06-50 Henryite Cu4Ag3Te4 Unk Cubic

II/B.06-55 Brodtkorbite! Cu2HgSe2 P 2₁/n 2/m

II/B.06-60 Imiterite Ag2HgS2 P 2₁/c 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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Mckinstryite

(Ag,Cu)2S
Dana No: 2.4.5.1 Strunz No: II/B.06-20
Locality:

Notes: