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Cechite Mineral Data
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General Cechite Information
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 Chemical Formula: |
Pb(Fe++,Mn)(VO4)(OH) |
| Composition: |
Molecular Weight = 394.54 gm |
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Manganese 6.96 % Mn 8.99 % MnO |
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Vanadium 12.91 % V 23.05 % V2O5 |
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Iron 7.08 % Fe 9.11 % FeO |
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Hydrogen 0.26 % H 2.28 % H2O |
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Lead 52.52 % Pb 56.57 % PbO |
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Oxygen 20.28 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
PbFe2+0.5Mn2+0.5(VO4)(OH) |
| Environment: |
On specimens form old mine dumps from a polymetallic ore deposit. |
| IMA Status: |
Approved IMA 1981 |
| Locality: |
Vrancice, Pribram, Stredocsky Kraj, Cechy, Bohemia, Czech Republic. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Frantisek Cech (1944-), mineralogist, Charles University, Prague, Czech Republic. |
| Synonym: |
ICSD 43079 |
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PDF 35-530 |
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Cechite Image |
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Images:
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Cechite
Comments: Black tabular crystal of cechite on matrix.
Location: Alexander Gallery, Vrancice, PrÃbram, Stredoceský Kraj, Bohemia, Czech Republic.
Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag |
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Cechite Crystallography
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| Axial Ratios: |
a:b:c =0.8057:1:0.6456 |
| Cell Dimensions: |
a = 7.607, b = 9.441, c = 6.096, Z = 4; V = 437.80 Den(Calc)= 5.99 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam |
| X Ray Diffraction: |
By Intensity(I/Io): 3.228(1), 2.625(0.81), 5.119(0.77), |
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Physical Properties of Cechite
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| Cleavage: |
None |
| Color: |
Black. |
| Density: |
5.88 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
| Hardness: |
4.5-5 - Near Apatite |
| Luster: |
Sub Metallic |
| Magnetism: |
Magnetic |
| Streak: |
black |
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Optical Properties of Cechite
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| Optical Data: |
Biaxial (?) |
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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
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| RL Anisotrophism: |
Perceptible to strong, light gray to dark gray with brownish tint. |
| RL Bireflectance: |
Weak to imperceptible. |
| RL Color: |
Gray white with a yellowish tint, whitish, yellowish or rosy internal reflections. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Cechite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 420 nm |
17.00 |
19.30 |
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| 440 nm |
16.30 |
18.90 |
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| 460 nm |
16.00 |
18.50 |
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| 480 nm |
15.60 |
18.30 |
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| 500 nm |
15.40 |
18.10 |
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| 520 nm |
15.10 |
17.80 |
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| 540 nm |
14.80 |
17.60 |
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| 560 nm |
14.60 |
17.60 |
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| 580 nm |
14.40 |
17.70 |
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| 600 nm |
14.40 |
18.00 |
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| 620 nm |
14.50 |
18.30 |
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| 640 nm |
14.80 |
18.60 |
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| 660 nm |
15.10 |
18.90 |
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| 680 nm |
15.20 |
18.80 |
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| 700 nm |
15.30 |
18.70 |
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Calculated Relative Intensity Colors of Cechite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
590% |
| R1 |
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| R2 |
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Calculated Properties of Cechite
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| Electron Density: |
Bulk Density (Electron Density)=5.21 gm/cc
note: Specific Gravity of Cechite =5.99 gm/cc.
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| Fermion Index: |
Fermion Index = 0.11
Boson Index = 0.89 |
| Photoelectric: |
PECechite = 934.40 barns/electron
U=PECechite x rElectron Density=4,865.89 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cechite is Not Radioactive |
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Cechite Classification
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| Dana Class: |
41.05.02.04 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen |
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(41.05)where (A B)2 (XO4) Zq |
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(41.05.02)Descloizite Group |
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41.05.02.01 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m |
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41.05.02.02 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m |
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41.05.02.03 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m |
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41.05.02.04 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m |
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41.05.02.05 Duftite-alpha PbCu(AsO4)(OH) P 212121 2 2 2 |
| Strunz Class: |
08.BH.40 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.B - Phosphates, etc. with Additional Anions, without H2O |
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08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1 |
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08.BH.40 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m |
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08.BH.40 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m |
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08.BH.40 Duhamelite? Pb2Cu4Bi(VO4)4(OH)3•8(H2O) Unk Ortho |
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08.BH.40 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m |
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08.BH.40 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m |
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Other Cechite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4) |
| 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 - 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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Cechite
Pb(Fe++,Mn)(VO4)(OH)
Dana No: 41.05.02.04 Strunz No: 08.BH.40
Locality:
Notes:
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