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Retzian-(Nd)

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Anders Jahan Retzius
Formula:
Mn22+(Nd,Ce,La)(AsO4)(OH)4
System:
Orthorhombic
Colour:
Pinkish brown to dark ...
Hardness:
3 - 4
Name:
Named in 1982 by Pete J. Dunn and Bozidar Darko Sturman in honor of Anders Jahan Retzius [October 3, 1742 Kristianstad, Sweden - October 6, 1821 Stockholm, Sweden], Swedish naturalist and Professor of Botany, Chemistry, and Natural History at Lund University, plus the -(Nd) suffix due to the dominance of Nd in the composition relative to the earlier Ce-dominant mineral.
Isostructural with:

Classification of Retzian-(Nd)

Approved 1982
Explanation of status:
redefinition of retzian, not requiring approval of the Commission
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
41.3.4.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
20.4.18

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
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http://www.mindat.org/min-3394.html
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Type Occurrence of Retzian-(Nd)

General Appearance of Type Material:
euhedral crystals
Place of Conservation of Type Material:
Smithsonian 143762
Geological Setting of Type Material:
Metamorphosed stratiform zinc orebody
Associated Minerals at Type Locality:

Physical Properties of Retzian-(Nd)

Sub-Vitreous, Resinous, Dull
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
sub-vitreous to dull on crystal faces and vitreous on fracture surfaces
Colour:
Pinkish brown to dark reddish brown
Comment:
Darker in center of crystals
Streak:
Very light brown
Hardness (Mohs):
3 - 4
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
Possible parting observed, possibly parallel to color zoning
Fracture:
Irregular/Uneven, Sub-Conchoidal
Comment:
tends to break along parallel planes
Density:
3.77 - 4.01 g/cm3 (Measured)    4.45 g/cm3 (Calculated)
Comment:
greater than 4.2

Crystallography of Retzian-(Nd)

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pban
Space Group Setting:
Pban
Cell Parameters:
a = 5.69Å, b = 12.12Å, c = 4.874Å
Ratio:
a:b:c = 0.469 : 1 : 0.402
Unit Cell Volume:
V 336.12 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals maybe be tabular, but equant in two directions to slightly blocky somewhat rectangular prisms. Euhedral crystals with forms {001}, {010), {150}, {130), {110}, {201}, and {021), and is elongated parallel to {001]
Twinning:
Radial, spokelike, trillings or sixlings rare
X-Ray Powder Diffraction Data:
d-spacingIntensity
6.05 (20)
4.89 (30)
3.534 (60)
2.726 (100)
1.857 (30)
1.625 (20)
1.463 (20)
Comments:
Similar to retzian-(Ce) and retzian-(La)

Optical Data of Retzian-(Nd)

Type:
Biaxial (+)
RI values:
nα = 1.744 nβ = 1.782 nγ = 1.798
2V:
Measured: 69° , Calculated: 71°
Birefringence:
0.054
Max Birefringence:
δ = 0.054
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v moderate
Optical Extinction:
Parallel. XYZ = cba
Pleochroism:
Visible
Comments:
X= yellow
Y= reddish brown
Z= brown
Comments:
Original description said dispersion r

Chemical Properties of Retzian-(Nd)

Formula:
Mn22+(Nd,Ce,La)(AsO4)(OH)4
Essential elements:
All elements listed in formula:

Relationship of Retzian-(Nd) 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-(La)(Mn2+,Mg)2(La,Ce,Nd)(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)2(OH)5 · H2O
20.4.6ArsenocrandalliteCaAl3(AsO4)2(OH)5 · H2O
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
20.4.17Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4

Other Names for Retzian-(Nd)

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-(Nd)

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.

Dunn, P. J. and Sturman, B. D. (1982) Retzian-(Nd), a new mineral from Sterling Hill, New Jersey and a redefinition of retzian. American Mineralogist: 67: 841-845.

Internet Links for Retzian-(Nd)

Localities for Retzian-(Nd)

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
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. & Sturman, : Am.Min.:67:841-845 (1982); Dunn(1995)Pt5:679-680.
Mineral and/or Locality  
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