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Retzian-(La)

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Anders Jahan Retzius
Formula:
(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
System:
Orthorhombic
Colour:
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:

Classification of Retzian-(La)

Approved
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
41.3.4.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
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)

Place of Conservation of Type Material:
Smithsonian 160290
Geological Setting of Type Material:
Metamorphosed stratiform zinc orebody
Associated Minerals at Type Locality:

Physical Properties of Retzian-(La)

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:
4.49 g/cm3 (Calculated)
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 Data:
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
Max Birefringence:
δ = 0.022
Image 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:
(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
Essential elements:
All elements listed in formula:

Relationship of Retzian-(La) to other Species

Structurally related to group(s):
Retzian GroupMn22+REE(AsO4)(OH)4
8.BM.05Retzian-(Ce)Mn22+Ce(AsO4)(OH)4
8.BM.05Retzian-(Nd)Mn22+(Nd,Ce,La)(AsO4)(OH)4
8.BM.10Paulkellerite(BiO)2Fe3+(PO4)(OH)2
8.BM.10KolitschitePbZn0.5Fe3(AsO4)2(OH)6
8.BM.15Brendelite(Bi3+,Pb)2(Fe3+,Fe2+)(PO4)O2(OH)
20.4.1MansfielditeAlAsO4 · 2H2O
20.4.2BulachiteAl2(AsO4)(OH)3 · 3H2O
20.4.3PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2O
20.4.4LuetheiteCu2Al2(AsO4)2(OH)4
20.4.5ArsenogoyaziteSrAl3(AsO4)(AsO3OH)(OH)6
20.4.6ArsenocrandalliteCaAl3(AsO4)(AsO3OH)(OH)6
20.4.7Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6
20.4.8Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6
20.4.9Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6
20.4.10Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5
20.4.11Gasparite-(Ce)(Ce,REE)(AsO4)
20.4.12Chernovite-(Y)Y(AsO4)
20.4.13Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
20.4.14Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2O
20.4.15GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2O
20.4.16Retzian-(Ce)Mn22+Ce(AsO4)(OH)4
20.4.18Retzian-(Nd)Mn22+(Nd,Ce,La)(AsO4)(OH)4

Other Names for Retzian-(La)

Name in Other Languages:

Other Information

Not fluorescent in UV
Health Risks:
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)

Localities for Retzian-(La)

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • 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.
Mineral and/or Locality  
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