Čechite
A valid IMA mineral species
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About Čechite
František Čech
Formula:
PbFe2+(VO4)(OH)
Colour:
Black
Lustre:
Resinous, Sub-Metallic
Hardness:
4½ - 5
Specific Gravity:
5.88
Crystal System:
Orthorhombic
Member of:
Name:
Named by Zdeněk Mrázek and Zdeněk Táborský in 1981 in honor of František Čech [August 17, 1929 Mèřín near Velké, Mezíříkí, Czech Republic - September 4, 1995], mineralogist, Charles University, Prague, Czech Republic.
Co-Type Localities:
Isostructural with:
Name Encoding
CP1252:
Cechite
Latin-1:
Cechite
ASCII-7:
Cechite
Unique Identifiers
Mindat ID:
925
Long-form identifier:
mindat:1:1:925:6
IMA Classification of Čechite
Classification of Čechite
8.BH.40
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
41.5.2.4
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
21.4.19
21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni
21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Čec | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Čechite
Resinous, Sub-Metallic
Transparency:
Opaque
Colour:
Black
Comment:
{110} and {010}.
Streak:
Black
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Conchoidal
Density:
5.88 g/cm3 (Measured) 5.94 g/cm3 (Calculated)
Optical Data of Čechite
Type:
Biaxial
Anisotropism:
Visible to strong, light gray to dark gray with brownish tint.
Bireflectance:
Very weak to imperceptible.
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 460nm | 16.0% | 18.5% |
| 540nm | 14.8% | 17.6% |
| 580nm | 14.4% | 17.7% |
| 660nm | 15.1% | 18.9% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 18.9%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Gray white with a yellow tint (Blue light); yellow brown (yellow light); internal reflections vary from white, pale yellow, or rose
Chemistry of Čechite
Mindat Formula:
PbFe2+(VO4)(OH)
Element Weights:
Crystallography of Čechite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 7.605(3) Å, b = 9.435(4) Å, c = 6.099(2) Å
Ratio:
a:b:c = 0.806 : 1 : 0.646
Unit Cell V:
437.62 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Rounded crystals; anhedral.
Twinning:
None reported.
Comment:
SG Pnam
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.119 Å | (77) |
| 4.249 Å | (51) |
| 3.345 Å | (42) |
| 3.228 Å | (100) |
| 2.908 Å | (77) |
| 2.663 Å | (53) |
| 2.625 Å | (81) |
Comments:
ICDD 35-530
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Čechite
Co-Type Localities:
General Appearance of Type Material:
Granular masses up to 3 cm. Rare crystals up to 3 mm long.
Place of Conservation of Type Material:
Charles University, Praha, Czech Republic, 20037 (holotype).
Geological Setting of Type Material:
Old mine dumps of a polymetallic ore deposit.
Associated Minerals at Type Locality:
Other Language Names for Čechite
Relationship of Čechite to other Species
Member of:
Other Members of Adelite-Descloizite Group:
| Adelite | CaMg(AsO4)(OH) | Orth. 222 : P212121 |
| Arsendescloizite | PbZn(AsO4)(OH) | Orth. 222 : P212121 |
| Austinite | CaZn(AsO4)(OH) | Orth. 222 : P212121 |
| Cobaltaustinite | CaCo(AsO4)(OH) | Orth. 222 : P212121 |
| Conichalcite | CaCu(AsO4)(OH) | Orth. 222 : P212121 |
| Descloizite | PbZn(VO4)(OH) | Orth. mmm(2/m2/m2/m) : Pnma |
| Duftite | PbCu(AsO4)(OH) | Orth. 222 : P212121 |
| 'Duftite-alpha' | PbCu(AsO4)(OH) | |
| Gottlobite | CaMg(VO4)(OH) | Orth. 222 : P212121 |
| Hermannroseite | CaCu(PO4)(OH) | Orth. 222 : P212121 |
| Mottramite | PbCu(VO4)(OH) | Orth. mmm(2/m2/m2/m) : Pnma |
| Nickelaustinite | CaNi(AsO4)(OH) | Orth. 222 : P212121 |
| Plumbogottlobite | PbMg(VO4)(OH) | Orth. mmm(2/m2/m2/m) : Pnma |
| Pyrobelonite | PbMn2+(VO4)(OH) | Orth. mmm(2/m2/m2/m) : Pnma |
| Tangeite | CaCu(VO4)(OH) | Orth. 222 : P212121 |
| 'Unnamed (Pb-analogue of Nickelaustinite)' | PbNi(AsO4)(OH) | |
| Vuagnatite | CaAl(SiO4)(OH) | Orth. 222 : P212121 |
Common Associates
Associations Based on Photo Data:
| 30 photos of Čechite associated with Fluorite | CaF2 |
| 9 photos of Čechite associated with Chervetite | Pb2(V2O7) |
| 6 photos of Čechite associated with Calderónite | Pb2Fe3+(VO4)2(OH) |
| 3 photos of Čechite associated with Hematite | Fe2O3 |
| 3 photos of Čechite associated with Mottramite | PbCu(VO4)(OH) |
| 1 photo of Čechite associated with 'Apatite' | Ca5(PO4)3A |
Related Minerals - Strunz-mindat Grouping
| 8.BH. | Peterchinite | Zn3Zn2(OH)6As[O3(OH)3] |
| 8.BH. | Reznitskyite | CaMg(VO4)F |
| 8.BH. | Plumbogottlobite | PbMg(VO4)(OH) |
| 8.BH. | Cuprozheshengite | Pb4CuZn2(AsO4)2(PO4)2(OH)2 |
| 8.BH. | Zheshengite | Pb4ZnZn2(AsO4)2(PO4)2(OH)2 |
| 8.BH. | Crimsonite | PbFe3+2(PO4)2(OH)2 |
| 8.BH.05 | Thadeuite | Ca(Mg,Fe2+)3(PO4)2(OH,F)2 |
| 8.BH.10 | Panasqueiraite | CaMg(PO4)(OH) |
| 8.BH.10 | Isokite | CaMg(PO4)F |
| 8.BH.10 | Lacroixite | NaAl(PO4)F |
| 8.BH.10 | Arsenatrotitanite | NaTi(AsO4)O |
| 8.BH.10 | Maxwellite | NaFe3+(AsO4)F |
| 8.BH.10 | Durangite | NaAl(AsO4)F |
| 8.BH.10 | Kononovite | NaMg(SO4)F |
| 8.BH.15 | Drugmanite | Pb2Fe3+(PO4)(PO3OH)(OH)2 |
| 8.BH.20 | Nigelcookite | PbFe2+2V3+2(PO4)3(OH)3 |
| 8.BH.20 | Plumbojohntomaite | PbFe2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Cirrolite | Ca3Al2(PO4)3(OH)3 (?) |
| 8.BH.20 | Penikisite | Ba(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3 |
| 8.BH.20 | Perloffite | Ba(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Bjarebyite Group | |
| 8.BH.20 | Strontioperloffite | SrMn2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Plumboperloffite | PbMn2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Johntomaite | BaFe2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Bjarebyite | (Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3 |
| 8.BH.20 | Kulanite | Ba(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3 |
| 8.BH.25 | Bertossaite | Li2CaAl4(PO4)4(OH)4 |
| 8.BH.25 | Natropalermoite | Na2SrAl4(PO4)4(OH)4 |
| 8.BH.25 | Palermoite | Li2SrAl4(PO4)4(OH)4 |
| 8.BH.30 | Sewardite | CaFe3+2(AsO4)2(OH)2 |
| 8.BH.30 | Carminite | PbFe3+2(AsO4)2(OH)2 |
| 8.BH.35 | Adelite | CaMg(AsO4)(OH) |
| 8.BH.35 | Duftite | PbCu(AsO4)(OH) |
| 8.BH.35 | Cobaltaustinite | CaCo(AsO4)(OH) |
| 8.BH.35 | Nickelaustinite | CaNi(AsO4)(OH) |
| 8.BH.35 | Gabrielsonite | PbFe3+(As3+O3)O |
| 8.BH.35 | Conichalcite | CaCu(AsO4)(OH) |
| 8.BH.35 | Arsendescloizite | PbZn(AsO4)(OH) |
| 8.BH.35 | 'Duftite-alpha' | PbCu(AsO4)(OH) |
| 8.BH.35 | Gottlobite | CaMg(VO4)(OH) |
| 8.BH.35 | Austinite | CaZn(AsO4)(OH) |
| 8.BH.35 | Hermannroseite | CaCu(PO4)(OH) |
| 8.BH.35 | Tangeite | CaCu(VO4)(OH) |
| 8.BH.40 | Khorixasite | (Bi0.67◻0.33)Cu(VO4)(OH) |
| 8.BH.40 | Mottramite | PbCu(VO4)(OH) |
| 8.BH.40 | Descloizite | PbZn(VO4)(OH) |
| 8.BH.40 | Pyrobelonite | PbMn2+(VO4)(OH) |
| 8.BH.45 | Bayldonite | PbCu3(AsO4)2(OH)2 |
| 8.BH.45 | Vésigniéite | BaCu3(VO4)2(OH)2 |
| 8.BH.50 | Paganoite | NiBi(AsO4)O |
| 8.BH.55 | Jagowerite | BaAl2(PO4)2(OH)2 |
| 8.BH.55 | Harrisonite | Ca(Fe2+,Mg)6(PO4)2(SiO4)2 |
| 8.BH.60 | Attakolite | CaMn2+Al4(SiO3OH)(PO4)3(OH)4 |
| 8.BH.65 | Leningradite | PbCu3(VO4)2Cl |
| 8.BH.70 | Katiarsite | KTiO(AsO4) |
| 8.BH.70 | Yurgensonite | K2SnTiO2(AsO4)2 |
| 8.BH.75 | Melanarsite | K3Cu7Fe3+O4(AsO4)4 |
| 8.BH.80 | Evseevite | Na2Mg(AsO4)F |
| 8.BH.80 | Moraskoite | Na2Mg(PO4)F |
| 8.BH.85 | Piccoliite | NaCaMn3+2(AsO4)2O(OH) |
Fluorescence of Čechite
Not fluorescent.
Other Information
IR Spectrum:
The infra-red spectrum is very similar to those of descloizite and mottramite, giving absorption bands characteristic of the (VO4) group and (OH) group.
Notes:
Dissolves readily in HCl (1:1) or HNO3 (1:1).
Magnetic.
Magnetic.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Čechite
mindat.org URL:
https://www.mindat.org/min-925.html
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References for Čechite
Reference List:
Localities for Čechite
Showing 8 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Czech Republic (TL) | |
| Mrázek et al. (1981) +1 other reference |
| J.Hyrsl (1992) |
France | |
| Queneau (n.d.) |
Italy | |
| Balestra C. (2004) +1 other reference |
Spain | |
| Rosell et al. (2017) |
USA | |
| Castor et al. (2004) |
| Storm Sears collection |
|
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Maria Magdalena Mine, Ulldemolins, Priorat, Tarragona, Catalonia, Spain