Matildite Mineral Data

Matildite Mineral Data +

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General Matildite Information

Chemical Formula:

AgBiS2

Composition:

Molecular Weight = 380.98 gm

Silver 28.31 % Ag

Bismuth 54.85 % Bi

Sulfur 16.83 % S

______

100.00 %

Empirical Formula:

AgBiS₂

Environment:

Moderate to high temperature hydrothermal deposts and in pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1883

Locality:

Matilda mine, near Moroccha, Provinence Junin, Peru. Link to MinDat.org Location Data.

Name Origin:

Named after its locality

Synonym:

ICSD 44340

PDF 24-1031

Schapbachite

Matildite Image

Images:

Matildite

Comments: Gray platy metallic crystalline matildite in white quartz.
Location: Sullivan Mountain, Montezuma District, Summit County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Matildite Crystallography

Axial Ratios:

a:c = 1:4.66256

Cell Dimensions:

a = 4.066, c = 18.958, Z = 3; V = 271.43 Den(Calc)= 6.99

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 2.827(1), 3.3(0.8), 2.03(0.6),

Physical Properties of Matildite

Cleavage:

None

Color:

Gray, Iron black.

Density:

6.9

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

light gray

Optical Properties of Matildite

RL Anisotrophism:

Weak.

RL Color:

White.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Matildite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	41.40	47.20
420 nm	41.90	47.80
440 nm	42.20	48.30
460 nm	43.10	48.80
480 nm	43.40	49.30
500 nm	43.40	49.30
520 nm	43.00	49.00
540 nm	42.80	48.40
560 nm	42.50	47.80
580 nm	42.20	47.30
600 nm	41.70	46.90
620 nm	41.30	46.70
640 nm	40.80	46.70
660 nm	40.30	46.70
680 nm	39.90	46.30
700 nm	39.30	46.10

**Calculated Relative Intensity Colors of Matildite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	220%
R₁
R₂

Calculated Properties of Matildite

Electron Density:

r_electron=5.94 gm/cc
note: r_Matildite=6.99 gm/cc.

Fermion Index

Fermion Index = 0.00126
Boson Index = 0.99874

Photoelectric:

PE_Matildite=1,114.91 barns/electron
U=PE_Matildite x r_electron=6,627.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Matildite is Not Radioactive

Matildite Classification

Dana Class:

3.7.1.1 (3)Sulfides - Sulfosalts

(3.7)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.7.1)Dana Group

3.7.1.1 Matildite AgBiS2 P 3m1 3 2/m

3.7.1.2 Bohdanowiczite AgBiSe2 P 3m1 3 2/m

3.7.1.3 Volynskite AgBiTe2 P 3m1 3 2/m

3.7.1.4 Zlatogorite! CuNiSb2 P 3m1 3 2/m

Strunz Class:

II/C.16-30 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.16 - Miargyrite - Volynskite series

II/C.16-05 Cuboargyrite! AgSbS F m3m 4/m 3 2/m

II/C.16-10 Miargyrite AgSbS2 C 2/c 2/m

II/C.16-15 Baumstarkite! Ag3(Sb,As)2SbS6 P1 1

II/C.16-20 Aramayoite Ag3Sb2(Sb,Bi)S6 P1 1

II/C.16-30 Matildite AgBiS2 P 3m1 3 2/m

II/C.16-35 Schapbachite! AgBiS2 F m3m 4/m 3 2/m

II/C.16-40 Bohdanowiczite AgBiSe2 P 3m1 3 2/m

II/C.16-50 Volynskite AgBiTe2 P 3m1 3 2/m

Other Matildite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

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Matildite

AgBiS2
Dana No: 3.7.1.1 Strunz No: II/C.16-30
Locality:

Notes: