Kentrolite Mineral Data

Kentrolite Mineral Data
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General Kentrolite Information

Help on Chemical Formula: Chemical Formula: Pb2Mn+++2Si2O9
Help on Composition: Composition: Molecular Weight = 718.61 gm
   Magnesium   0.03 %  Mg    0.06 % MgO
   Titanium    0.27 %  Ti    0.44 % TiO2
   Manganese   9.79 %  Mn   14.06 % Mn2O3
   Aluminum    0.15 %  Al    0.28 % Al2O3
   Iron        4.74 %  Fe    6.78 % Fe2O3
   Silicon     7.89 %  Si   16.89 % SiO2
   Lead       57.09 %  Pb   61.50 % PbO
   Oxygen     20.04 %  O
             ______        ______ 
             100.00 %      100.01 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb1.98Mn3+1.28Fe3+0.61Al0.04Ti0.04Mg0.01Si2.02O9
Help on Environment: Environment: In a cavity in calcite in a metamorphosed stratiform zinc deposit. Forms a series with melanotekite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1880
Help on Locality: Locality: The unknown type locality is southern Chile. Vermland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for spike or thorn, for its prismatic habit.
Help on Name Pronunciation: Name Pronunciation: Kentrolite + Pronunciation Say KENTROLITE
 

Kentrolite Image

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

Kentrolite

Comments: Brownish red grains of kentrolite in matrix.
Location: Langban mine, Varmland, Sweden. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Kentrolite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.6317:1:0.9043
Help on Cell Dimensions: Cell Dimensions: a = 6.961, b = 11.018, c = 9.964, Z = 4; V = 764.20 Den(Calc)= 6.25
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.74(1), 2.86(1), 2.9(1),
Click Here for Large Kentrolite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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 Help on Above


Moore P B , Sen Gupta P K , Shen J , Schlemper E O , American Mineralogist , 76 (1991) p.1389-1399, The kentrolite-melanotekite series, 4Pb2(Mn,Fe)2O2[Si2O7]: Chemical, crystallographic relations, lone-pair splitting, and cation relation to 8URe2

 

Physical Properties of Kentrolite

Help on Cleavage: Cleavage: {110} Distinct
Help on Color: Color: Dark reddish brown, Reddish black.
Help on Density: Density: 6.19
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: dark brown
 

Optical Properties of Kentrolite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1925,KPDmeas= 0.1944,KC= 0.183
Ncalc = 2.13 - 2.14
Help on Optical Data: Optical Data: Biaxial (+), a=2.1, b=2.2, g=2.31, bire=0.2100, 2V(Calc)=88, 2V(Meas)=88. Dispersion strong, r < v.
Help on Pleochroism (x): Pleochroism (x): bright yellowish pink.
Help on Pleochroism (y): Pleochroism (y): reddish brown.
Help on Pleochroism (z): Pleochroism (z): deep brownish red.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Kentrolite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   14.70   18.70 
   
 420 nm   14.40   18.10 
 440 nm   14.10   17.50 
 460 nm   13.90   16.90 
 480 nm   13.60   16.40 
 500 nm   13.40   16.00 
 520 nm   13.20   15.70 
 540 nm   13.00   15.40 
 560 nm   12.90   15.20 
 580 nm   12.80   15.00 
 600 nm   12.60   14.90 
 620 nm   12.50   14.80 
 640 nm   12.50   14.70 
 660 nm   12.40   14.50 
 680 nm   12.40   14.40 
 700 nm   12.30   14.30 
Calculated Relative Intensity Colors of Kentrolite in Air
Relative
Intensity		    0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 690%
R1                        
R2                        
 

Calculated Properties of Kentrolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.43 gm/cc
note: Specific Gravity of Kentrolite =6.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PEKentrolite =1,013.97 barns/electron
U=PEKentrolite x rElectron Density=5,503.35 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kentrolite is Not Radioactive
 

Kentrolite Classification
Help on Dana Class: Dana Class: 56.02.10.02 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.10)Melanotekite group
 
56.02.10.01 Melanotekite Pb2Fe2Si2O9 C 2221 2 2 2
 
56.02.10.02 Kentrolite Pb2Mn2Si2O9 P bcn 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 09.BE.80 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.80 Kentrolite Pb2Mn2Si2O9 P bcn 2/m 2/m 2/m
 
09.BE.80 Melanotekite Pb2Fe2Si2O9 C 2221 2 2 2
 

Other Kentrolite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Kentrolite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Kentrolite

Pb2Mn+++2Si2O9
Dana No: 56.02.10.02 Strunz No: 09.BE.80
Locality:

 

Notes: