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Retzian-(Nd)

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Anders Jahan Retzius
Formula:
Mn2+2(Nd,Ce,La)(AsO4)(OH)4
Colour:
Pinkish brown to dark reddish brown
Lustre:
Sub-Vitreous, Resinous, Dull
Hardness:
3 - 4
Specific Gravity:
3.77 - 4.01
Crystal System:
Orthorhombic
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:
Hide all sections | Show all sections

Classification of Retzian-(Nd)Hide

Approved
Approval Year:
1982
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)

Physical Properties of Retzian-(Nd)Hide

Sub-Vitreous, Resinous, Dull
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:
3 - 4 on Mohs scale
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

Optical Data of Retzian-(Nd)Hide

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)Hide

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

Crystallography of Retzian-(Nd)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pban
Setting:
Pban
Cell Parameters:
a = 5.69 Å, b = 12.12 Å, c = 4.874 Å
Ratio:
a:b:c = 0.469 : 1 : 0.402
Unit Cell 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 DiffractionHide

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)

Type Occurrence of Retzian-(Nd)Hide

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:

Synonyms of Retzian-(Nd)Hide

Other Language Names for Retzian-(Nd)Hide

Relationship of Retzian-(Nd) to other SpeciesHide

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

Related Minerals - Nickel-Strunz GroupingHide

8.BM.05Retzian-(Ce)Mn2+2Ce(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
8.BM.05Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(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
41.3.4.3Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(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
20.4.17Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban

Fluorescence of Retzian-(Nd)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-(Nd)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.
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)Hide

Localities for Retzian-(Nd)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
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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