Matildite Mineral Data

[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.

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

Name Pronunciation:

Matildite + Pronunciation

Synonym:

Beegerite - mixture of schirmerite and matildite

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

Images:

Matildite Bismuth Bismuthinite

Comments: SEM image of native Bi replaced by bismuthinite and matildite. Black areas represent gangue minerals. (CanMin, v43:899).
Location: Uranium deposit at Niederschlema-Alberoda, Germany. Scale: See Image.
© Canadian Mineralogist

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Geller S , Wernick J H , Acta Crystallographica , 12 (1959) p.46-54, Ternary semiconducting compounds with sodium chloride-like structure: AgSbSe2,, AgSbTe2, AgBiS2, AgBiSe2, Locality: synthetic, Sample: annealed at T = 152 C for t = 15 days

Physical Properties of Matildite

Cleavage:

None

Color:

Gray, Iron black.

Density:

6.9

Diaphaneity:

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:

Bulk Density (Electron Density)=5.94 gm/cc
note: Specific Gravity of Matildite =6.99 gm/cc.

Fermion Index:

Fermion Index = 0.0012630538
Boson Index = 0.9987369462

Photoelectric:

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

Radioactivity:

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

Matildite Classification

Dana Class:

03.07.01.01 (03)Sulfides - Sulfosalts

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

(03.07.01)Matildite Group

03.07.01.01 Matildite AgBiS2 P 3m1 3 2/m

03.07.01.02 Bohdanowiczite AgBiSe2 P 3m1 3 2/m

03.07.01.03 Volynskite AgBiTe2 P 3m1 3 2/m

03.07.01.04 Zlatogorite! CuNiSb2 P 3m1 3 2/m

Strunz Class:

02.JA.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.J - Sulfosalts of PbS Archetype

02.JA -Galena derivatives with little or no Pb

02.JA.20 Bohdanowiczite AgBiSe2 P 3m1 3 2/m

02.JA.20 Matildite AgBiS2 P 3m1 3 2/m

02.JA.20 Volynskite AgBiTe2 P 3m1 3 2/m

Other Matildite Information

References:

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

See Also:

Links to other databases for Matildite :
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

Search for Matildite using:

[ALTAVISTA] [AOL] [bing] [GeoScienceWorld] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Matildite :

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Lapis Mineral Journal

Mineral News

UV Tools

Wrights Rock Shop

Translate Matildite Mineral Data :

Ask about Matildite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Matildite

AgBiS2
Dana No: 03.07.01.01 Strunz No: 02.JA.20
Locality:

Notes: