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Molybdofornacite

Big Photo

Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA
© Wm. Wise (2006)

Show Molybdofornacite Photos (26)
Formula:
Pb
 
2
Cu[OH|(AsO
 
4
,PO
 
4
)|(MoO
 
4
,CrO
 
4
)]
System:MonoclinicColour:Light green
Lustre:AdamantineHardness:2 - 3
This page provides mineralogical data about Molybdofornacite.

Classification of Molybdofornacite

IMA status:Approved 1982
Strunz 8th edition ID:6/F.02-30
Nickel-Strunz 10th (pending) edition ID:7.FC.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
Dana 8th edition ID:43.4.3.3

43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hey's CIM Ref.:22.5.5

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate
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Type Occurrence of Molybdofornacite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia

Physical Properties of Molybdofornacite

Lustre:Adamantine
Colour:Light green
Hardness (Mohs):2 - 3

Crystallography of Molybdofornacite

Crystal System:Monoclinic
Cell Parameters:a = 8.1Å, b = 5.94Å, c = 17.65Å
β = 109.17°
Ratio:a:b:c = 1.364 : 1 : 2.971
Unit Cell Volume:V 802.12 ų (Calculated from Unit Cell)

Optical Data of Molybdofornacite

Type:Biaxial (+)
RI values: nα = 2.050 nγ = 2.150
Maximum Birefringence:δ = 0.100

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v strong

Chemical Properties of Molybdofornacite

Formula:
Pb
 
2
Cu[OH|(AsO
 
4
,PO
 
4
)|(MoO
 
4
,CrO
 
4
)]
Essential elements:As, Cu, H, Mo, O, Pb
All elements listed in formula:As, Cr, Cu, H, Mo, O, P, Pb

Relationship of Molybdofornacite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.FC.05Vauquelinite
Pb
 
2
Cu[OH|PO
 
4
|CrO
 
4
]
7.FC.10Fornacite
Pb
 
2
Cu[OH|AsO
 
4
|CrO
 
4
]
7.FC.15Hemihedrite
Pb
 
10
Zn[(F,OH)
 
2
|(CrO
 
4
)
 
6
|(SiO
 
4
)
 
2
]
7.FC.15Iranite
Pb
 
10
Cu[(F,OH)
 
2
|(CrO
 
4
)
 
6
|(SiO
 
4
)
 
2
]
7.FC.20Cassedanneite
Pb
 
5
[VO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
7.FC.20Embreyite
Pb
 
5
[PO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.5.1Vauquelinite
Pb
 
2
Cu[OH|PO
 
4
|CrO
 
4
]
22.5.2Embreyite
Pb
 
5
[PO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
22.5.3Cassedanneite
Pb
 
5
[VO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
22.5.4Fornacite
Pb
 
2
Cu[OH|AsO
 
4
|CrO
 
4
]
22.5.6Mendozavilite
Na(Ca,Mg)
 
2
[Fe
 
6
(PO
 
4
)
 
2
(PMo
 
11
O
 
39
)(OH,Cl)
 
10
]·33H
 
2
O
22.5.7Paramendozavilite
NaAl
 
4
[Fe
 
7
(PO
 
4
)
 
5
(PMo
 
12
O
 
40
)(OH)
 
16
]·56H
 
2
O
22.5.8Betpakdalite
{Mg(H
 
2
O)
 
6
}Ca
 
2
(H
 
2
O)
 
13
[Mo
6+
8
As
5+
2
Fe
3+
3
O
 
36
(OH)](H
 
2
O)
 
4
22.5.9Natrobetpakdalite
(Na
 
2
,Ca)Fe
 
2
(As
 
2
Mo
 
6
O
 
28
)·15H
 
2
O
22.5.10Obradovicite
H
 
4
(K,Na)CuFe
 
2
AsO
 
4
(MoO
 
4
)
 
5
·12H
 
2
O
22.5.11Melkovite
CaFeH
 
6
(MoO
 
4
)
 
4
PO
 
4
·6H
 
2
O or near·
22.5.12Rankachite
(V
4+
 
,V
5+
 
)(W
6+
 
,Fe
3+
 
)
 
2
O
 
8
(OH)•(Ca
 
x
H
 
2
O
 
y
) with x ~ 0.5, y ~ 2.
22.5.13Olmsteadite
KFe
2+
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
2
 · 2H
 
2
O
22.5.14Johnwalkite
K(Mn
2+
 
,Fe
2+
 
,Fe
3+
 
)
 
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
2
 · 2(H
 
2
O,OH)

Other Names for Molybdofornacite

Synonyms:
IMA1982-062
Other Languages:
German:Molybdofornacit
Spanish:Molybdofornacita

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 Molybdofornacite

Reference List:Neues Jahrbuch für Mineralogie, Monatshefte (1983): 289-295.

American Mineralogist (1984): 69: 567.

Internet Links for Molybdofornacite

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    Localities for Molybdofornacite

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