Geocronite Mineral Data

Geocronite Mineral Data
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General Geocronite Information

Help on Chemical Formula: Chemical Formula: Pb14(Sb,As)6S23
Help on Composition: Composition: Molecular Weight = 4,321.99 gm
   Antimony  14.08 %  Sb
   Arsenic    1.73 %  As
   Lead      67.12 %  Pb
   Sulfur    17.06 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb14Sb5AsS23
Help on Environment: Environment: Hydrothermal veins with sulfides and other sulfosalt minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1839
Help on Locality: Locality: Meredo, Galicia, Spain. Kilbricken Co.., Clare, Ireland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "Earth" and "Saturn", the alchemistic name for lead.
Help on Name Pronunciation: Name Pronunciation: Geocronite + Pronunciation Say GEOCRONITE
Help on Synonym: Synonym: ICSD 41808
  Kilbrickenite
  PDF 43-1474
 

Geocronite Image

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

Geocronite

Comments: Many black geocronite crystals intergrown in milky quartz(?) matrix.
Location: Sala Silver Mine, Sala, Västmanland, Sweden. Scale: 17x17x12 mm.
© John Betts - Fine Minerals

Geocronite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.2807:1:0.2662
Help on Cell Dimensions: Cell Dimensions: a = 8.963, b = 31.93, c = 8.5, Z = 2; beta = 118.02° V = 2,147.46 Den(Calc)= 6.68
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.537(1), 3.056(0.97), 2.8897(0.96),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
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<space> - Start-Stop Rotation
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Help on Above

Forms: ( 2 2 5) ( 2 2 5) ( 0 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 Geocronite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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A - Atoms On/Off
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B - Bonds On/Off
 Help on Above


Birnie R W , Burnham C W , American Mineralogist , 61 (1976) p.963-970, The crystal structure and extent of solid solution of geocronite

 

Physical Properties of Geocronite

Help on Cleavage: Cleavage: {011} Distinct
Help on Color: Color: Blue gray, Gray, Silver white.
Help on Density: Density: 6.4
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: lead gray
 

Optical Properties of Geocronite

Help on RL Anisotrophism: RL Anisotrophism: Moderate.
Help on RL Color: RL Color: Pure white.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Geocronite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   44.70   44.80 
   
 420 nm   43.50   44.00 
 440 nm   42.30   43.20 
 460 nm   41.30   42.30 
 480 nm   40.50   41.60 
 500 nm   39.90   41.00 
 520 nm   39.30   40.50 
 540 nm   38.80   40.10 
 560 nm   38.40   39.70 
 580 nm   38.10   39.30 
 600 nm   37.80   39.00 
 620 nm   37.40   38.50 
 640 nm   37.00   38.10 
 660 nm   36.50   37.60 
 680 nm   36.00   37.00 
 700 nm   35.40   36.30 
Calculated Relative Intensity Colors of Geocronite in Air
Relative
Intensity		    0%   30%   60%   90% 100% 120% 150% 180% 210% 240%
R1                    
R2                    
 

Calculated Properties of Geocronite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.58 gm/cc
note: Specific Gravity of Geocronite =6.68 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEGeocronite =1,286.21 barns/electron
U=PEGeocronite x rElectron Density=7,172.53 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Geocronite is Not Radioactive
 

Geocronite Classification
Help on Dana Class: Dana Class: 03.03.01.02 (03)Sulfides - Sulfosalts
  (03.03)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.03.01)Dana Group
 
03.03.01.01 Jordanite Pb14(As,Sb)6S23 P 21/m 2/m
 
03.03.01.02 Geocronite Pb14(Sb,As)6S23 P 21/m 2/m
Help on Strunz Class: Strunz Class: 02.JB.30a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.J - Sulfosalts of PbS Archetype
  02.JB -Galena derivatives, with Pb
 
02.JB.30a Jordanite Pb14(As,Sb)6S23 P 21/m 2/m
 
02.JB.30a Geocronite Pb14(Sb,As)6S23 P 21/m 2/m
 

Other Geocronite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Geocronite :
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 Geocronite here :
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Print or Cut-and-Paste your Geocronite Specimen Label here :

Geocronite

Pb14(Sb,As)6S23
Dana No: 03.03.01.02 Strunz No: 02.JB.30a
Locality:

 

Notes: