Retzian-(La)
A valid IMA mineral species
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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
Member of:
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.
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:
Unique Identifiers
Mindat ID:
3393
Long-form identifier:
mindat:1:1:3393:6
GUID
(UUID V4):
(UUID V4):
49d51e1b-2f50-4e34-ada8-80c166dbf14e
IMA Classification of Retzian-(La)
Classification of Retzian-(La)
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
41.3.4.3
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
20.4.17
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 |
|---|---|---|
| Rtz-La | 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-(La)
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)
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.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
Strong, r > v.
Optical Extinction:
Parallel. X = c; Y = b; Z = a.
Pleochroism:
Weak
Comments:
Pale brown to pale violet brown.
Comments:
Absorption: Z > Y > X.
Chemistry of Retzian-(La)
Mindat Formula:
(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
Crystallography of Retzian-(La)
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. Forms include {001}, {010}, {110}, and {150}.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.98 Å | (30) |
| 4.84 Å | (30) |
| 3.51 Å | (80) |
| 2.715 Å | (100) |
| 1.848 Å | (50) |
| 1.615 Å | (30) |
| 1.456 Å | (40) |
Comments:
Similar to retzian-(Ce) and retzian-(Nd).
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-(La)
General Appearance of Type Material:
Euhedral, pseudohexagonal crystals to 0.5 mm.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 160290.
Geological Setting of Type Material:
Metamorphosed stratiform zinc orebody.
Associated Minerals at Type Locality:
Synonyms of Retzian-(La)
Other Language Names for Retzian-(La)
Russian:Ретциан-(La)
Relationship of Retzian-(La) to other Species
Member of:
Other Members of this group:
| Retzian-(Ce) | Mn2+2Ce(AsO4)(OH)4 | Orth. mmm (2/m 2/m 2/m) : Pban |
| Retzian-(Nd) | Mn2+2(Nd,Ce,La)(AsO4)(OH)4 | Orth. mmm (2/m 2/m 2/m) : Pban |
Structurally related to group(s):
| Retzian Group | Mn2+2REE(AsO4)(OH)4 |
Related Minerals - Strunz-mindat Grouping
| 8.BM. | Betpakdalite-NaNa | [Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] |
| 8.BM. | Gunmaite | (Na2Sr)Sr2Al10(PO4)4F14(OH)12 |
| 8.BM.05 | Retzian-(Ce) | Mn2+2Ce(AsO4)(OH)4 |
| 8.BM.05 | Retzian-(Nd) | Mn2+2(Nd,Ce,La)(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-(La)
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-(La)
mindat.org URL:
https://www.mindat.org/min-3393.html
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References for Retzian-(La)
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
Dunn, Pete J., Peacor, Donald R., Simmons, William B. (1984) Retzian-(La), a new mineral from Sterling Hill, Sussex County, New Jersey. Mineralogical Magazine, 48 (349) 533-535 doi:10.1180/minmag.1984.048.349.08
Localities for Retzian-(La)
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.
Kazakhstan | |
| Vereshchagin et al. (2019) |
Switzerland | |
| Stalder et al. (1998) +1 other reference |
USA (TL) | |
| Dunn et al. (1984) +1 other reference |
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