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Retzian-(La)

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Formula:
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4
System:OrthorhombicColour:Dark reddish-brown
Hardness:3 - 4
Name:
Named in 1984 by Pete J. Dunn, Donald Ralph Peacor, and William B. Simmons in honor of Anders Jahan Retzius [October 3, 1742 Kristianstad, Sweden - October 6, 1821 Stockholm, Sweden], Swedish naturalist and Professor of Botany, chemist, and natural history at Lund University, plus the -(La) suffix due to the dominance of La in the composition relative to the earlier Ce-dominant mineral.
Isostructural with:Retzian-(Ce), Retzian-(Nd)

Classification of Retzian-(La)

IMA status:Approved
Strunz 8th edition ID:7/B.15-20
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:41.3.4.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
Hey's CIM Ref.:20.4.17

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-(La)

Type Locality:Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
Place of Conservation of Type Material:Smithsonian 160290
Geological Setting of type material:Metamorphosed stratiform zinc orebody
Associated Minerals at type locality:
WillemiteTodorokiteFrankliniteCalcite

Physical Properties of Retzian-(La)

Lustre:Sub-Vitreous, Resinous, Waxy
Diaphaneity (Transparency):Transparent
Comment:Sub-vitreous on fractures, otherwise dull
Colour:Dark reddish-brown
Streak:Light brown
Hardness (Mohs):3 - 4
Tenacity:Brittle
Cleavage:None Observed
Fracture:Sub-Conchoidal
Comment:Fracture even
Density (calculated):4.49 g/cm3
Comment:Measured > 4.2

Crystallography of Retzian-(La)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pban
Space Group Setting:Pban
Cell Parameters:a = 5.670Å, b = 12.01Å, c = 4.869Å
Ratio:a:b:c = 0.472 : 1 : 0.405
Unit Cell Volume:V 331.56 ų (Calculated from Unit Cell)
Z:2
Morphology:Pseudohexagonal, also blocky
X-Ray Powder Diffraction:
d-spacingIntensity
5.98 (30)
4.84 (30)
3.51 (80)
2.715 (100)
1.848 (50)
1.615 (30)
1.456 (40)
Comments:Similar to retzian(Ce) and retzian-(Nd)

Optical Data of Retzian-(La)

Type:Biaxial (+)
RI values: nα = 1.766 nβ = 1.773 nγ = 1.788
2V:Measured: 82° , Calculated: 70°
Birefringence:0.022
Maximum Birefringence:δ = 0.022

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:strong r > v
Optical Extinction:Parallel, XYZ=cba
Pleochroism:Weak
Comments:pale brown to pale violet brown

Chemical Properties of Retzian-(La)

Formula:
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4
Simplified for copy/paste:(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
Essential elements:As, H, La, Mn, O
All elements listed in formula:As, Ce, H, La, Mg, Mn, Nd, O

Relationship of Retzian-(La) to other Species

Structurally related to group(s):
Retzian Group
Mn
2+
2
REE(AsO
 
4
)(OH)
 
4
Related Minerals - Nickel-Strunz Grouping):

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

- +
20.4.1Mansfieldite
AlAsO
 
4
· 2H
 
2
O
20.4.2Bulachite
Al
 
2
(AsO
 
4
)(OH)
 
3
· 3H
 
2
O
20.4.3Pharmacoalumite
KAl
 
4
(AsO
 
4
)
 
3
(OH)
 
4
· 6.5H
 
2
O
20.4.4Luetheite
Cu
 
2
Al
 
2
(AsO
 
4
)
 
2
(OH)
 
4
20.4.5Arsenogoyazite
SrAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
20.4.6Arsenocrandallite
CaAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
20.4.7Arsenoflorencite-(Ce)
CeAl
 
3
(AsO
 
4
)
 
2
(OH)
 
6
20.4.8Arsenoflorencite-(La)
(La,Ce,Nd)(Al,Fe
3+
 
)
 
3
(AsO
 
4
,PO
 
4
)
 
2
(OH)
 
6
20.4.9Arsenoflorencite-(Nd)
NdAl
 
3
(AsO
 
4
)
 
2
(OH)
 
6
20.4.10Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
(AsO
 
4
)(OH)
 
5
20.4.11Gasparite-(Ce)
(Ce,REE)(AsO
 
4
)
20.4.12Chernovite-(Y)
Y(AsO
 
4
)
20.4.13Agardite-(Y)
(Y,Ca)Cu
 
6
(AsO
 
4
)
 
2
(AsO
 
4
,HAsO
 
4
)(OH)
 
6
· 3H
 
2
O
20.4.14Agardite-(La)
(La,Ce)Cu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
· 3H
 
2
O
20.4.15Goudeyite
(Al,Y)Cu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
· 3H
 
2
O
20.4.16Retzian-(Ce)
Mn
2+
2
Ce(AsO
 
4
)(OH)
 
4
20.4.18Retzian-(Nd)
Mn
2+
2
(Nd,Ce,La)(AsO
 
4
)(OH)
 
4

Other Names for Retzian-(La)

Synonyms:
IMA1983-077
Other Languages:
Russian:Ретциан-(La)

Other Information

Fluorescence in UV light:Not fluorescent in UV
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-(La)

Reference List:

- +
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.

Mineralogical Magazine (1984): 48: 533-535.

American Mineralogist (1985): 70: 1332.

Internet Links for Retzian-(La)

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Retzian-(La) details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Retzian-(La)

    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.
    Switzerland
     
    • St Gallen
      • Alvier Group
        • Sargans
    Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 347.; Roth, P. & Meisser, N. (2013): Die seltenen Mineralien der Bündner Manganvorkommen. Schweizer Strahler 47 (3), 8-21 (in German and French).
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Ogdensburg
            • Sterling Hill
    Dunn, P.J., et al: Min.Mag.:48:533-535 (1984); Dunn(1995):Pt5:678-679.
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