Smithite Mineral Data (original) (raw)

General Smithite Information

Help on Chemical Formula: Chemical Formula:

AgAsS2

Help on Composition: Composition:

Molecular Weight = 246.92 gm

Silver 43.69 % Ag

Arsenic 30.34 % As

Sulfur 25.97 % S

______

100.00 %

Help on Empirical Formula: Empirical Formula:

AgAsS2

Help on Environment: Environment:

Of hydrothermal origin with other Ag-As sulfides.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1905

Help on Locality: Locality:

Lengenbach quarry, Binnental, Valais, Switzerland. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for George Frederick Smith (1872-1953), crystallographer of the British Museum, London, England.

Help on Name Pronunciation: Name Pronunciation:

Smithite Say SMITHITE

Help on Synonym: Synonym:

ICSD 64984

PDF 42-554

Smithite Image

Click Here for Larger Smithite Image in a New Browser Window Images:

Click Here for Larger Smithite Image Smithite Comments: Spheric, pseudo-hexagonal, reddish crystal of smithite with a gray sulfosalt on white dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland.Scale: Crystal size 0.5 mm. © Walter Gabriel

Click Here for Larger Smithite Image in a New Browser Window Images:

Click Here for Larger Smithite Image Smithite Chabourneite Comments: Black metallic chabourneite with conchoidal fracture, associated with yellow-red realgar and deep-red smithite. Location: Jas Roux, Pelvoux Mt., Valgaudemar, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France.Scale: See Image. © Rruff Database

Smithite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =2.2164:1:1.9536

Help on Cell Dimensions: Cell Dimensions:

a = 17.2, b = 7.76, c = 15.16, Z = 24; beta = 101.2° V = 1,984.90 Den(Calc)= 4.96

Help on Crystal System: Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.82(1), 3.21(0.8), 2.72(0.6),

Help on Forms: Forms:

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| | Forms:( 3 1 1) ( 3 1 1) ( 2 1 1) ( 4 1 1) ( 3 2 0) ( 1 0 1) ( 1 1 1) ( 1 0 0) ( 1 1 3) ( 5 1 1) ( 0 0 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Smithite Structure Window Crystal Structure:

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| | Hellner E , Burzlaff H , Naturwissenschaften , 51 (1964) p.35-36, Die struktur des smithits AgAsS2, Locality: Legenbach quarry, Binnatal, Switzerland | | -------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Smithite

Help on Cleavage: Cleavage:

{100} Perfect

Help on Color: Color:

Brown orange, Light red, Orange red.

Help on Density: Density:

4.9

Help on Diaphaneity: Diaphaneity:

Subtranslucent to opaque

Help on Fracture: Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Help on Habit: Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Help on Habit: Habit:

Pyramidal - Crystals are shaped like pyramids.

Help on Hardness: Hardness:

1.5-2 - Talc-Gypsum

Help on Luminescence: Luminescence:

Non-fluorescent.

Help on Luster: Luster:

Sub Metallic

Help on Streak: Streak:

vermilion red

Optical Properties of Smithite

Help on Optical Data: Optical Data:

Biaxial (-), b=3.27, 2V(Meas)=~65.

Help on Pleochroism (x): Pleochroism (x):

slight.

Help on Pleochroism (y): Pleochroism (y):

slight.

Help on Pleochroism (z): Pleochroism (z):

slight.

Help on Reflectivity Reflectivity

Standardized Intensity (100%) Reflection Spectra of Smithite in Air

λ R1 R 2 ∑ R1(λ) ∑ R2(λ)
400 nm 40.70 44.00
420 nm 40.00 43.20
440 nm 39.30 42.40
460 nm 38.70 41.50
480 nm 37.90 40.40
500 nm 37.00 39.20
520 nm 36.00 38.00
540 nm 35.00 36.60
560 nm 33.80 35.40
580 nm 32.70 34.70
600 nm 32.00 34.00
620 nm 31.40 33.40
640 nm 31.00 32.90
660 nm 30.60 32.40
680 nm 30.40 31.80
700 nm 30.10 31.40

Calculated Relative Intensity Colors of Smithite in Air

RelativeIntensity 0% 30% 60% 90% 100% 120% 150% 180% 210% 240% 270%
R1
R2

Calculated Properties of Smithite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=4.50 gm/cc
note: Specific Gravity of Smithite =4.96 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0019479447
Boson Index = 0.9980520553

Help on Photoelectric: Photoelectric:

PESmithite = 132.86 barns/electron
U=PESmithite x rElectron Density= 597.80 barns/cc.

Help on Radioactivity: Radioactivity:

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

Smithite Classification

Help on Dana Class: Dana Class:

03.07.03.01 (03)Sulfides - Sulfosalts

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

(03.07.03)Dana Group

03.07.03.01 Smithite AgAsS2 A2/a 2/m

03.07.03.02 Miargyrite AgSbS2 C 2/c 2/m

Help on Strunz Class: Strunz Class:

02.GC.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.G - Sulfarsenites, sulfantimonites, sulfbismuthites

02.GC -Poly-sulfarsenites

02.GC.30 Smithite AgAsS2 A2/a 2/m

Other Smithite Information

Help on References: References:

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

Help on See Also: See Also:

Links to other databases for Smithite :
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
15 - WWW-MINCRYST

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

Smithite

AgAsS2
Dana No: 03.07.03.01 Strunz No: 02.GC.30
Locality:

Notes: