Retzian-(Nd)
A valid IMA mineral species
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About Retzian-(Nd)
Anders Jahan Retzius
Formula:
Mn2+2Nd(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
Member of:
Name:
Named in 1982 by Pete J. Dunn and Bozidar Darko Sturman for its relationship to retzius-(Ce). The -(Nd) suffix denotes the dominance of neodymium 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, Chemistry, and Natural History at Lund University.
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, Chemistry, and Natural History at Lund University.
Isostructural with:
Unique Identifiers
Mindat ID:
3394
Long-form identifier:
mindat:1:1:3394:3
Similar Names
| Retzian-(Ce) | A valid IMA mineral species | Mn22+Ce(AsO4)(OH)4 |
| Retzian-(La) | A valid IMA mineral species | Mn22+La(AsO4)(OH)4 |
IMA Classification of Retzian-(Nd)
Approved
IMA Formula:
Mn2+2NdAs5+O4(OH)4
Approval year:
1982
First published:
1982
Classification of Retzian-(Nd)
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
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
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)
20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rtz-Nd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Retzian-(Nd)
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)
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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v moderate
Optical Extinction:
Parallel. XYZ = cba.
Pleochroism:
Visible
Comments:
X= yellow
Y= reddish brown
Z= brown
Y= reddish brown
Z= brown
Comments:
Original description said dispersion r
Chemistry of Retzian-(Nd)
Mindat Formula:
Mn2+2Nd(AsO4)(OH)4
Element Weights:
Crystallography of Retzian-(Nd)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/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. Elongated parallel to [100], with forms {001}, {010}, {150} (rare), {130}, {110}, {201}, {021} (rare).
Twinning:
Radial, spokelike, trillings or sixlings rare
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.05 Å | (20) |
| 4.89 Å | (30) |
| 3.534 Å | (60) |
| 2.726 Å | (100) |
| 1.857 Å | (30) |
| 1.625 Å | (20) |
| 1.463 Å | (20) |
Comments:
Similar to retzian-(Ce) and retzian-(La).
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Retzian-(Nd)
General Appearance of Type Material:
Euhedral crystals.
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1983,238.
Geological Survey of Canada, Ottawa, Ontario, Canada.
Royal Ontario Museum, Toronto, Ontario, Canada.
American Museum of Natural History, New York City, New York, USA.
Harvard University, Cambridge, Massachusetts, USA, number 119000.
National Museum of Natural History, Washington, D.C., USA, number 143762.
Geological Survey of Canada, Ottawa, Ontario, Canada.
Royal Ontario Museum, Toronto, Ontario, Canada.
American Museum of Natural History, New York City, New York, USA.
Harvard University, Cambridge, Massachusetts, USA, number 119000.
National Museum of Natural History, Washington, D.C., USA, number 143762.
Geological Setting of Type Material:
Metamorphosed stratiform zinc orebody.
Associated Minerals at Type Locality:
Synonyms of Retzian-(Nd)
Other Language Names for Retzian-(Nd)
Relationship of Retzian-(Nd) to other Species
Member of:
Other Members of Retzian Group:
| Retzian-(Ce) | Mn2+2Ce(AsO4)(OH)4 | Orth. mmm(2/m2/m2/m) : Pban |
| Retzian-(La) | Mn2+2La(AsO4)(OH)4 | Orth. mmm(2/m2/m2/m) : Pban |
Structurally related to group(s):
| Retzian Group | Mn2+2REE(AsO4)(OH)4 |
Related Minerals - Strunz-mindat Grouping
| 8.BM. | Gunmaite | (Na2Sr)Sr2Al10(PO4)4F14(OH)12 |
| 8.BM. | Betpakdalite-NaNa | [Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] |
| 8.BM.05 | Retzian-(Ce) | Mn2+2Ce(AsO4)(OH)4 |
| 8.BM.05 | Retzian-(La) | Mn2+2La(AsO4)(OH)4 |
| 8.BM.10 | Paulkellerite | (BiO)2Fe3+(PO4)(OH)2 |
| 8.BM.10 | Kolitschite | PbZn0.5Fe3(AsO4)2(OH)6 |
| 8.BM.15 | Brendelite | (Bi3+,Pb)2(Fe3+,Fe2+)(PO4)O2(OH) |
Fluorescence of Retzian-(Nd)
Not fluorescent in UV
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Retzian-(Nd)
mindat.org URL:
https://www.mindat.org/min-3394.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Retzian-(Nd)
Reference List:
Moore, Paul B. (1967) Crystal chemistry of the basic manganese arsenate minerals: I. The crystal structures of flinkite, Mn2+2Mn3+(OH)4(AsO4) and retzian, Mn2+2Y3+(OH)4(AsO4) American Mineralogist, 52 (11-12) 1603-1613
Localities for Retzian-(Nd)
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Switzerland | |
| Roth et al. (2013) |
USA (TL) | |
| Dunn et al. (1982) +1 other reference |
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Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA