Stromeyerite Mineral Data

Stromeyerite Mineral Data +

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General Stromeyerite Information

Chemical Formula:

AgCuS

Composition:

Molecular Weight = 203.48 gm

Copper 31.23 % Cu

Silver 53.01 % Ag

Sulfur 15.76 % S

______

100.00 %

Empirical Formula:

CuAgS

Environment:

Copper-silver veins where silver replaces copper in bornite.

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Zmeinogorsk mine, Kolyvan, Siberia, Russia Link to MinDat.org Location Data.

Name Origin:

Named after Friedrich Stromeyer (1776-1835), German mineralogiist and chemist,

Synonym:

ICSD 66580

PDF 44-1436

Stromeyerite Image

Images:

Stromeyerite

Comments: 1.5 cm spray of hair-like Stromeyerite crystals on quartz and calcite matrix.
Location: Vrancice near Pribram, Czech Republic. Scale: Picture size 2 cm.
© John Veevaert

Stromeyerite Crystallography

Axial Ratios:

a:b:c =0.6096:1:1.1996

Cell Dimensions:

a = 4.06, b = 6.66, c = 7.99, Z = 4; V = 216.05 Den(Calc)= 6.26

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mcm

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

By Intensity(I/I_o): 2.61(1), 2.07(0.8), 3.33(0.8),

Physical Properties of Stromeyerite

Cleavage:

None

Color:

Blue gray, Dark blue, Dark steel gray, Steel gray.

Density:

6 - 6.3, Average = 6.15

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

steel gray

Optical Properties of Stromeyerite

RL Anisotrophism:

Strong, vivid blue and deep violet.

RL Color:

White, dull grayish.

RL Pleochroism:

Weak in air, stronger in oil, grayish brown to whitish gray, with a faint bluish gray tint or creamy.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Stromeyerite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	32.90	40.00
420 nm	32.20	40.70
440 nm	31.50	41.40
460 nm	30.40	38.60
480 nm	29.20	36.00
500 nm	28.40	33.80
520 nm	28.00	32.10
540 nm	27.70	31.00
560 nm	27.50	30.20
580 nm	27.40	29.70
600 nm	27.30	29.40
620 nm	27.30	29.10
640 nm	27.30	28.90
660 nm	27.40	28.80
680 nm	27.60	28.90
700 nm	27.80	29.00

**Calculated Relative Intensity Colors of Stromeyerite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%
R₁
R₂

Calculated Properties of Stromeyerite

Electron Density:

r_electron=5.66 gm/cc
note: r_Stromeyerite=6.26 gm/cc.

Fermion Index

Fermion Index = 0.00118
Boson Index = 0.99882

Photoelectric:

PE_Stromeyerite= 149.03 barns/electron
U=PE_Stromeyerite x r_electron= 843.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stromeyerite is Not Radioactive

Stromeyerite Classification

Dana Class:

2.4.6.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.4.6)Dana Group

2.4.6.1 Stromeyerite AgCuS C mcm 2/m 2/m 2/m

2.4.6.2 Eucairite CuAgSe Pmmn 2/m 2/m 2/m

Strunz Class:

II/B.06-30 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 Stromeyerite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Print or Cut-and-Paste your Stromeyerite Specimen Label here :

Stromeyerite

AgCuS
Dana No: 2.4.6.1 Strunz No: II/B.06-30
Locality:

Notes: