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Retzian-(Ce)

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Moss mine, Nordmark, Filipstad, Värmland, Sweden
© Knut Eldjarn

Show Retzian-(Ce) Photos (2)
Formula:
Mn
2+
2
Ce(AsO
 
4
)(OH)
 
4
System:OrthorhombicColour:Chocolate brown to ...
Hardness:4
Name:
Named after Anders Jahon Retzius (1742-1821), Swedish naturalist and Professor of Botany plus the -(Ce) suffix due to the dominance of Ce in the composition.


Retzian Group. The Ce analogue of Retzian-(La) and Retzian-(Nd).

Classification of Retzian-(Ce)

IMA status:Approved
Strunz 8th edition ID:7/B.15-30
Nickel-Strunz 10th (pending) edition ID:8.BM.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
M : With medium-sized and large cations, (OH, etc.):RO4 = 4:1
Dana 8th edition ID:41.3.4.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
Hey's CIM Ref.:20.4.16

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
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Type Occurrence of Retzian-(Ce)

Type Locality:Moss mine, Nordmark, Filipstad, Värmland, Sweden
Place of Conservation of Type Material:Smithsonian
Geological Setting of type material:Cavities in dolomite
Associated Minerals at type locality:
JacobsitePyrochroite

Physical Properties of Retzian-(Ce)

Lustre:Vitreous, Greasy
Diaphaneity (Transparency):Translucent
Colour:Chocolate brown to chestnut-brown; brown in transmitted light.
Streak:Light brown
Hardness (Mohs):4
Fracture:Irregular/Uneven, Conchoidal
Density (measured):4.15 g/cm3
Density (calculated):4.45 g/cm3

Crystallography of Retzian-(Ce)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pban {P2/b 2/a 2/n}
Space Group Setting:Pban
Cell Parameters:a = 5.670(3) Å, b = 12.03(1) Å, c = 4.863(4) Å
Ratio:a:b:c = 0.471 : 1 : 0.404
Unit Cell Volume:V 331.71 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals prismatic [001], sometimes also tabular {010}.
Twinning:On {150}, doubtful.

Optical Data of Retzian-(Ce)

Type:Biaxial (+)
RI values: nα = 1.777 nβ = 1.788 nγ = 1.800
Maximum Birefringence:δ = 0.023

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v slight
Pleochroism:Visible
Comments:X = c = Nearly colourless to orange-yellow
Y = b = Yellowish brown to dark brown
Z = a = Red-brown to crimson red.

Chemical Properties of Retzian-(Ce)

Formula:
Mn
2+
2
Ce(AsO
 
4
)(OH)
 
4
Essential elements:As, Ce, H, Mn, O
All elements listed in formula:As, Ce, H, Mn, O

Relationship of Retzian-(Ce) to other Species

Member of Group:
Retzian Group:
Mn
2+
2
REE(AsO
 
4
)(OH)
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
8.BM.05Retzian-(La)
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4
8.BM.05Retzian-(Nd)
Mn
2+
2
(Nd,Ce,La)(AsO
 
4
)(OH)
 
4
8.BM.10Paulkellerite
(BiO)
 
2
Fe
3+
 
[(OH)
 
2
|PO
 
4
]
8.BM.10Kolitschite
PbZn
 
0.5
Fe
 
3
(AsO
 
4
)
 
2
(OH)
 
6
8.BM.15Brendelite
(Bi
3+
 
,Pb)
 
2
(Fe
3+
 
,Fe
2+
 
)[(O,OH)
 
3
|PO
 
4
]
Related Minerals - Hey's Index Grouping:

- +
20.4.1Mansfieldite
AlAsO
 
4
·2H
 
2
O
20.4.2Bulachite
Al
 
2
[(OH)
 
3
|AsO
 
4
] · 3H
 
2
O
20.4.3Alumopharmacosiderite
KAl
 
4
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 6-7H
 
2
O
20.4.4Luetheite
Cu
 
2
Al
 
2
[(OH)
 
2
|AsO
 
4
]
 
2
20.4.5Arsenogoyazite
SrAl
 
3
[(OH)
 
5
|(AsO
 
4
)
 
2
] · H
 
2
O
20.4.6Arsenocrandallite
(Ca,Sr)Al
 
3
[(OH)
 
5
|(AsO
 
4
,PO
 
4
)
 
2
] · H
 
2
O
20.4.7Arsenoflorencite-(Ce)
CeAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.8Arsenoflorencite-(La)
LaAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.9Arsenoflorencite-(Nd)
NdAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.10Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
AsO
 
4
(OH)
 
5
20.4.11Gasparite-(Ce)
(Ce,REE)AsO
 
4
20.4.12Chernovite-(Y)
YAsO
 
4
20.4.13Agardite-(Y)
(Y,Ca)Cu
 
6
[(OH)
 
6
|(AsO
 
4
,HAsO
 
4
)|(AsO
 
4
)
 
2
] · 3H
 
2
O
20.4.14Agardite-(La)
(La,Ce)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.4.15Goudeyite
(Al,Y)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.4.17Retzian-(La)
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4
20.4.18Retzian-(Nd)
Mn
2+
2
(Nd,Ce,La)(AsO
 
4
)(OH)
 
4

Other Names for Retzian-(Ce)

Synonyms:
Retzian
Other Languages:
Russian:Ретциан-(Ce)

Other Information

Other Information:Soluble in acids.
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 Retzian-(Ce)

Reference List:Sjögren (1894) Bulletin of the Geological Institute Upsala: 2: 54 (as Retzian).

Sjögren (1897) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 19 (as Retzian).

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 126.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 794-795 (as Retzian).

American Mineralogist (1967): 52: 1603-1613.

Moore, P.B. (1968) Contributions to Swedish mineralogy. I. Studies on the basic arsenates of manganese: retzian, hemafibrite, synadelphite, arsenoclasite, arseniopleite, and akrochordite. Arkiv. Mineral. Geol., 4(5), 425–444.

American Mineralogist (1982): 67: 841-845.

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    Localities for Retzian-(Ce)

    Hide Locality List
    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.
    (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.
    South Africa
     
    • Northwest Province
      • Western Bushveld Complex
        • Rustenburg District
          • Pilansberg Complex
    		The Canadian Mineralogist, V 42, 2004, pp. 1169-1178.
    Sweden
     
    • Värmland
      • Filipstad
        • Nordmark
    		Min.Mag.(1978) 42, 133-136
    Bull. Geol. Inst. Univ. Upsala (1895): 2, 54-59; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 795.
    Mineral and/or Locality
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