Cechite Mineral Data

Cechite Mineral Data
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General Cechite Information

Help on Chemical Formula: Chemical Formula: Pb(Fe++,Mn)(VO4)(OH)
Help on Composition: Composition: Molecular Weight = 394.54 gm
   Manganese   6.96 %  Mn    8.99 % MnO
   Vanadium   12.91 %  V    23.05 % V2O5
   Iron        7.08 %  Fe    9.11 % FeO
   Hydrogen    0.26 %  H     2.28 % H2O
   Lead       52.52 %  Pb   56.57 % PbO
   Oxygen     20.28 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbFe2+0.5Mn2+0.5(VO4)(OH)
Help on Environment: Environment: On specimens form old mine dumps from a polymetallic ore deposit.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Vrancice, Pribram, Stredocsky Kraj, Cechy, Bohemia, Czech Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frantisek Cech (1944-), mineralogist, Charles University, Prague, Czech Republic.
Help on Synonym: Synonym: ICSD 43079
  PDF 35-530
 

Cechite Image

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Cechite

Comments: Black tabular crystal of cechite on matrix.
Location: Alexander Gallery, Vrancice, Príbram, Stredoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Cechite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.8057:1:0.6456
Help on Cell Dimensions: Cell Dimensions: a = 7.607, b = 9.441, c = 6.096, Z = 4; V = 437.80 Den(Calc)= 5.99
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.228(1), 2.625(0.81), 5.119(0.77),
Click Here for Large Cechite Structure Window Crystal Structure:

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Pertlik F , Neues Jahrbuch fur Mineralogie, Monatshefte , 1989 (1989) p.34-40, The crystal structure of cechite, Pb(Fe,Mn)(VO4)(OH) with Fe>Mn. A mineral of the descloizite group, Locality: Vrancice, Bohemian pluton, Pribram, Czechoslovakia (Czech Republic)

 

Physical Properties of Cechite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 5.88
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Magnetic
Help on Streak: Streak: black
 

Optical Properties of Cechite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.1962) where Ncalc=Dcalc*KC+1
NCalc= 2.15 - from Gladstone-Dale relationship (KC = 0.1962) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Perceptible to strong, light gray to dark gray with brownish tint.
Help on RL Bireflectance: RL Bireflectance: Weak to imperceptible.
Help on RL Color: RL Color: Gray white with a yellowish tint, whitish, yellowish or rosy internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Cechite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 420 nm   17.00   19.30 
   
 440 nm   16.30   18.90 
 460 nm   16.00   18.50 
 480 nm   15.60   18.30 
 500 nm   15.40   18.10 
 520 nm   15.10   17.80 
 540 nm   14.80   17.60 
 560 nm   14.60   17.60 
 580 nm   14.40   17.70 
 600 nm   14.40   18.00 
 620 nm   14.50   18.30 
 640 nm   14.80   18.60 
 660 nm   15.10   18.90 
 680 nm   15.20   18.80 
 700 nm   15.30   18.70 
Calculated Relative Intensity Colors of Cechite in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 590%
R1                        
R2                        
 

Calculated Properties of Cechite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.21 gm/cc
note: Specific Gravity of Cechite =5.99 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PECechite = 934.40 barns/electron
U=PECechite x rElectron Density=4,865.89 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cechite is Not Radioactive
 

Cechite Classification
Help on Dana Class: Dana Class: 41.05.02.04 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.05)where (A B)2 (XO4) Zq
  (41.05.02)Descloizite Group
 
41.05.02.01 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m
 
41.05.02.02 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m
 
41.05.02.03 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m
 
41.05.02.04 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m
 
41.05.02.05 Duftite-alpha PbCu(AsO4)(OH) P 212121 2 2 2
Help on Strunz Class: Strunz Class: 08.BH.40 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
 
08.BH.40 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m
 
08.BH.40 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m
 
08.BH.40 Duhamelite? Pb2Cu4Bi(VO4)4(OH)3•8(H2O) Unk Ortho
 
08.BH.40 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m
 
08.BH.40 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m
 

Other Cechite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Cechite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Cechite

Pb(Fe++,Mn)(VO4)(OH)
Dana No: 41.05.02.04 Strunz No: 08.BH.40
Locality:

 

Notes: