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Krettnichite

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Manganese mine (incl. Johann Shaft; Jakob Adit), Krettnich, Wadern, Saarland, Germany
© Thomas Witzke

Show Krettnichite Photos (4)
Formula:
(Pb,Sr)(Mn
3+
 
,Co)
 
2
[VO
 
4
]
 
2
 · 2(OH,H
 
2
O)
System:MonoclinicColour:Reddish-brown
Lustre:AdamantineHardness:4½
Name:Named for the Type Locality near Krettnich, Saarland, Germany
This page provides mineralogical data about Krettnichite.

Classification of Krettnichite

IMA status:Approved 1998
Strunz 8th edition ID:7/C.31-74
Nickel-Strunz 10th (pending) edition ID:8.CG.15

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
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Type Occurrence of Krettnichite

Type Locality:Manganese mine (incl. Johann Shaft; Jakob Adit), Krettnich, Wadern, Saarland, Germany
Associated Minerals at type locality:
PyrobeloniteMottramiteBrackebuschite

Physical Properties of Krettnichite

Lustre:Adamantine
Diaphaneity (Transparency):Translucent on thin edges, Opaque
Colour:Reddish-brown
Streak:Brown
Hardness (Mohs):4½
Density (measured):4.5 - 4.8 g/cm3

Crystallography of Krettnichite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m (B1 1 2/m) [C2/m] {C1 2/m 1}
Cell Parameters:a = 9.29Å, b = 6.29Å, c = 7.69Å
β = 118°
Ratio:a:b:c = 1.477 : 1 : 1.223
Unit Cell Volume:V 396.76 ų (Calculated from Unit Cell)
Morphology:{001}, {111}, {332}, {331}

Epitaxial Relationships of Krettnichite

Epitaxial Minerals:
Brackebuschite
Epitaxi Comments:(201) Krettnichite x (102) Brackebuschite
X-Ray Powder Diffraction:
d-spacingIntensity
3.39 (95)
3.27 (100)
2.49 (95)

Optical Data of Krettnichite

Type:Biaxial
RI values: nα = 2.210 nγ = 2.390
Maximum Birefringence:δ = 0.180

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:relatively strong
Internal Reflections:red
Pleochroism:Visible
Comments:reddish brown to orange
Comments:observed on thin sections

Chemical Properties of Krettnichite

Formula:
(Pb,Sr)(Mn
3+
 
,Co)
 
2
[VO
 
4
]
 
2
 · 2(OH,H
 
2
O)
Idealised Formula:
PbMn
3+
2
[VO
 
4
]
 
2
 · 2(OH)
Essential elements:H, Mn, O, Pb, V
All elements listed in formula:Co, H, Mn, O, Pb, Sr, V

Relationship of Krettnichite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CG.05Cassidyite
Ca
 
2
(Ni
2+
 
,Mg)[PO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Collinsite
Ca
 
2
(Mg,Fe
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Gaitite
Ca
 
2
Zn[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Parabrandtite
Ca
 
2
Mn
2+
 
[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Talmessite
Ca
 
2
Mg[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05β-Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
8.CG.05Hillite
Ca
 
2
(Zn,Mg)[PO
 
4
]
 
2
 · 2 H
 
2
O
8.CG.10Brandtite
Ca
 
2
(Mn
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.10Roselite
Ca
 
2
(Co
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.10Wendwilsonite
Ca
 
2
(Mg,Co
2+
 
)[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.10Zincroselite
Ca
 
2
Zn[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.15Ferrilotharmeyerite
Ca(Fe
3+
 
,Zn)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Lotharmeyerite
Ca(Zn,Mn
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Mawbyite
Pb(Fe
3+
 
,Zn)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Mounanaite
PbFe
3+
2
[VO
 
4
]
 
2
 · 2(OH,F)
8.CG.15Thometzekite
Pb(Cu,Zn)
 
2
[AsO
 
4
,SO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Tsumcorite
Pb(Zn,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Cobaltlotharmeyerite
Ca(Co,Fe
3+
 
,Ni)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Cabalzarite
Ca(Mg,Al,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Cobalttsumcorite
Pb(Co,Fe
3+
 
,Ni)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Nickellotharmeyerite
Ca(Ni,Fe
3+
 
,Co)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Manganlotharmeyerite
Ca(Mn
3+
 
,Zn)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Schneebergite
(Bi
3+
 
,Ca)(Co,Ni,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Nickelschneebergite
(Bi
3+
 
,Ca)(Ni,Co,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.20Gartrellite
Pb(Cu,Fe
3+
 
,Zn)
 
2
[AsO
 
4
,SO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.20Helmutwinklerite
Pb(Zn,Cu)
 
2
[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.20Zincgartrellite
Pb(Zn,Fe
3+
 
,Cu)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.20Rappoldite
Pb(Co,Ni,Zn)
 
2
[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.20Phosphogartrellite
Pb(Cu,Fe
3+
 
)
 
2
[PO
 
4
,AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.20Lukrahnite
Ca(Cu,Zn)(Fe
3+
 
,Zn)[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.25Pottsite
HPbBi(VO
 
4
)
 
2
·2H
 
2
O

Other Names for Krettnichite

Synonyms:
IMA1998-044
Other Languages:
German:Krettnichit
Russian:Креттнихит
Spanish:Krettnichita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Krettnichite

Reference List:Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (2000): 129(6):42.

Brugger, J.; Armbruster, T.; Criddle, A.; Berlepsch, P.; Graeser, S.; Reeves, S. (2001): Description, crystal structure, and paragenesis of krettnichite, PbMn3+2(VO4)2(OH)2, the Mn3+ analogue of mounanaite. European Journal of Mineralogy: 13: 145-158.

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    Localities for Krettnichite

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    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Saarland
      • Wadern
        • Krettnich
    		[Eur.J.Mineral. 13:145-158]
    Mineral and/or Locality
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