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Retzian-(La)

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Anders Jahan Retzius
Formula:
(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
Colour:
Dark reddish-brown
Lustre:
Sub-Vitreous, Resinous, Waxy
Hardness:
3 - 4
Specific Gravity:
4.49 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in 1984 by Pete J. Dunn, Donald Ralph Peacor, and William B. Simmons for its relationship to retzius-(Ce). The -(La) suffix denotes the dominance of lanthanum in the composition relative to the earlier cerium-dominant mineral.

The root name is 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.
Isostructural with:
Hide all sections | Show all sections

Classification of Retzian-(La)Hide

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)

Physical Properties of Retzian-(La)Hide

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

Optical Data of Retzian-(La)Hide

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)Hide

Formula:
(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
IMA Formula:
Mn2+2La(AsO4)(OH)4

Crystallography of Retzian-(La)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pban
Setting:
Pban
Cell Parameters:
a = 5.670 Å, b = 12.01 Å, c = 4.869 Å
Ratio:
a:b:c = 0.472 : 1 : 0.405
Unit Cell V:
331.56 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Pseudohexagonal, also blocky

X-Ray Powder DiffractionHide

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)

Type Occurrence of Retzian-(La)Hide

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

Synonyms of Retzian-(La)Hide

Other Language Names for Retzian-(La)Hide

Relationship of Retzian-(La) to other SpeciesHide

Structurally related to group(s):
Retzian GroupMn2+2REE(AsO4)(OH)4

Related Minerals - Nickel-Strunz GroupingHide

8.BM.Betpakdalite-NaNa[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] Mon. 2/m : B2/m
8.BM.05Retzian-(Ce)Mn2+2Ce(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
8.BM.05Retzian-(Nd)Mn2+2(Nd,Ce,La)(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
8.BM.10Paulkellerite(BiO)2Fe3+(PO4)(OH)2Mon. 2/m : B2/b
8.BM.10KolitschitePbZn0.5Fe3(AsO4)2(OH)6Mon. 2/m : B2/b
8.BM.15Brendelite(Bi3+,Pb)2(Fe3+,Fe2+)(PO4)O2(OH)Mon. 2/m : B2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

41.3.4.1Retzian-(Ce)Mn2+2Ce(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
41.3.4.2Retzian-(Nd)Mn2+2(Nd,Ce,La)(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.4.1MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
20.4.2BulachiteAl2(AsO4)(OH)3 · 3H2OOrth.
20.4.3PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2OIso. 4 3m : P4 3m
20.4.4LuetheiteCu2Al2(AsO4)2(OH)4Mon. 2/m : P21/m
20.4.5ArsenogoyaziteSrAl3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
20.4.6ArsenocrandalliteCaAl3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m)
20.4.7Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6Trig. 3m (3 2/m) : R3m
20.4.8Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6Trig. 3m (3 2/m) : R3m
20.4.9Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6Trig.
20.4.10Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5Tric.
20.4.11Gasparite-(Ce)Ce(AsO4)
20.4.12Chernovite-(Y)Y(AsO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
20.4.13Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
20.4.14Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2OHex. 6/m
20.4.15GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2OHex.
20.4.16Retzian-(Ce)Mn2+2Ce(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
20.4.18Retzian-(Nd)Mn2+2(Nd,Ce,La)(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban

Fluorescence of Retzian-(La)Hide

Not fluorescent in UV

Other InformationHide

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)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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)Hide

Localities for Retzian-(La)Hide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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: Mineralogical Magazine:48:533-535 (1984); Dunn(1995):Pt5:678-679.
Mineral and/or Locality  
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