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Carlfrancisite

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Formula:
Mn
2+
3
(Mn
2+
 
,Mg,Fe
3+
 
,Al)
 
42
[As
3+
 
O
 
3
]
 
2
(As
5+
 
O
 
4
)
 
4
[(Si,As
5+
 
)O
 
4
]
 
6
[(As
5+
 
,Si)O
 
4
]
 
2
(OH)
 
42
System:Trigonal
Name:
Named in honor of Dr. Carl A. Francis, mineralogist and former curator of the Harvard University Mineralogical Museum (for 34 years). His professional interests include systematic mineralogy and the geology of pegmatites.


Closely related to mcgovernite and turtmannite.

Classification of Carlfrancisite

IMA status:Approved 2012
Nickel-Strunz 10th (pending) edition ID:8.BE.45

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
Dana 8th edition ID:43.4.9.3

43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
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Type Occurrence of Carlfrancisite

Type Locality:E15-11 south stope, 11 level, Asia West sector, Kombat Mine (Klein Otavi; Asis), Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Place of Conservation of Type Material:In the collections of the Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada, catalogue number M56375

Crystallography of Carlfrancisite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:R3c
Space Group Setting:R3c
Cell Parameters:a = 8.2238(2) Å, c = 205.113(6) Å
Ratio:a:c = 1 : 24.941
Unit Cell Volume:V 12,013.48 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
4.107(48)
3.243(54)
3.051(43)
2.918(47)
2.826(100)
2.676(63)
2.371(88)
1.552(84)

Chemical Properties of Carlfrancisite

Formula:
Mn
2+
3
(Mn
2+
 
,Mg,Fe
3+
 
,Al)
 
42
[As
3+
 
O
 
3
]
 
2
(As
5+
 
O
 
4
)
 
4
[(Si,As
5+
 
)O
 
4
]
 
6
[(As
5+
 
,Si)O
 
4
]
 
2
(OH)
 
42
Simplified for copy/paste:Mn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42
Essential elements:As, H, Mn, O, Si
All elements listed in formula:Al, As, Fe, H, Mg, Mn, O, Si

Relationship of Carlfrancisite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BE.05Augelite
Al
 
2
(PO
 
4
)(OH)
 
3
8.BE.10Grattarolaite
Fe
3+
3
(PO
 
4
)O
 
3
8.BE.15Cornetite
Cu
 
3
(PO
 
4
)(OH)
 
3
8.BE.20Clinoclase
Cu
 
3
(AsO
 
4
)(OH)
 
3
8.BE.25Arhbarite
Cu
 
2
Mg(AsO
 
4
)(OH)
 
3
8.BE.25Gilmarite
Cu
 
3
(AsO
 
4
)(OH)
 
3
8.BE.30Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
8.BE.30Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
8.BE.30Raadeite
Mg
 
7
(PO
 
4
)
 
2
(OH)
 
8
8.BE.30Argandite
Mn
 
7
(VO
 
4
)
 
2
(OH)
 
8
8.BE.35Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.35Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.40Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
(AsO
 
4
)(OH)
 
5
8.BE.45Dixenite
CuMn
2+
14
Fe
2+
 
(SiO
 
4
)
 
2
(As
5+
 
O
 
4
)(As
3+
 
O
 
3
)
 
5
(OH)
 
6
8.BE.45Hematolite
(Mn,Mg,Al,Fe
3+
 
)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
8.BE.45Kraisslite
Zn
 
3
(Mn,Mg)
 
25
(Fe
3+
 
,Al)(As
3+
 
O
 
3
)
 
2
[(Si,As
5+
 
)O
 
4
]
 
10
(OH)
 
16
8.BE.45Mcgovernite
Mn
 
19
Zn
 
3
(AsO
 
4
)
 
3
(AsO
 
3
)(SiO
 
4
)
 
3
(OH)
 
21
8.BE.45Arakiite
(Zn,Mn
2+
 
)(Mn
2+
 
,Mg)
 
12
(Fe
3+
 
,Al)
 
2
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
8.BE.45Turtmannite
(Mn,Mg)
 
22.5
Mg
 
3-3x
((V
5+
 
,As
5+
 
)O
 
4
)
 
3
(As
3+
 
O
 
3
)
 
x
(SiO
 
4
)
 
3
O
 
5-5x
(OH)
 
20+x
8.BE.50Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
· 2H
 
2
O
8.BE.55Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
(AsO
 
4
)
 
2
(SiO
 
4
)(OH)
 
8
8.BE.60Kolicite
Mn
2+
7
Zn
 
4
(AsO
 
4
)
 
2
(SiO
 
4
)
 
2
(OH)
 
8
8.BE.65Sabelliite
(Cu,Zn)
 
2
Zn(AsO
 
4
,SbO
 
4
)(OH)
 
3
8.BE.70Jarosewichite
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
8.BE.75Theisite
Cu
 
5
Zn
 
5
(AsO
 
4
,SbO
 
4
)
 
2
(OH)
 
14
8.BE.80Coparsite
Cu
 
4
(AsO
 
4
,VO
 
4
)O
 
2
Cl
8.BE.85Waterhouseite
Mn
2+
7
(PO
 
4
)
 
2
(OH)
 
8

Other Names for Carlfrancisite

Synonyms:
IMA2012-033
Other Languages:

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 Carlfrancisite

Reference List:

- +
Hawthorne, F.C. and Pinch, W.W. (2012): Carlfrancisite, IMA 2012-033. CNMNC Newsletter No. 14, October 2012, page 1286; Mineralogical Magazine, 76, 1281-1288.

Internet Links for Carlfrancisite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
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  • Search for Carlfrancisite on Well-Arranged Molecules
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  • Localities for Carlfrancisite

    (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.
    Namibia
     
    • Otjozondjupa Region
      • Grootfontein District
        • Kombat
          • Kombat Mine (Klein Otavi; Asis)
            • Asia West sector
              • 11 level
    Hawthorne, F.C. and Pinch, W.W. (2012): Carlfrancisite, IMA 2012-033. CNMNC Newsletter No. 14, October 2012, page 1286; Mineralogical Magazine, 76, 1281-1288.
    Mineral and/or Locality  
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