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Retzian-(Ce)

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Anders Jahan Retzius
Formula:
Mn22+Ce(AsO4)(OH)4
System:
Orthorhombic
Colour:
Chocolate brown to ...
Hardness:
4
Name:
Named after Anders Jahon Retzius (1742-1821), Swedish naturalist and Professor of Botany plus the -(Ce) suffix due to the dominance of Ce in the composition.
Retzian Group. The Ce analogue of Retzian-(La) and Retzian-(Nd).

Classification of Retzian-(Ce)

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
41.3.4.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
20.4.16

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
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First Recorded Occurrence of Retzian-(Ce)

Place of Conservation of First Recorded Material:
Smithsonian
Geological Setting of First Recorded Material:
Cavities in dolomite
Associated Minerals at First Recorded Locality:

Physical Properties of Retzian-(Ce)

Vitreous, Greasy
Diaphaneity (Transparency):
Translucent
Colour:
Chocolate brown to chestnut-brown; brown in transmitted light.
Streak:
Light brown
Hardness (Mohs):
4
Fracture:
Irregular/Uneven, Conchoidal
Density:
4.15 g/cm3 (Measured)    4.45 g/cm3 (Calculated)

Crystallography of Retzian-(Ce)

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pban
Space Group Setting:
Pban
Cell Parameters:
a = 5.670(3) Å, b = 12.03(1) Å, c = 4.863(4) Å
Ratio:
a:b:c = 0.471 : 1 : 0.404
Unit Cell Volume:
V 331.71 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals prismatic [001], sometimes also tabular {010}.
Twinning:
On {150}, doubtful.

Optical Data of Retzian-(Ce)

Type:
Biaxial (+)
RI values:
nα = 1.777 nβ = 1.788 nγ = 1.800
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v slight
Pleochroism:
Visible
Comments:
X = c = Nearly colourless to orange-yellow
Y = b = Yellowish brown to dark brown
Z = a = Red-brown to crimson red.

Chemical Properties of Retzian-(Ce)

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

Relationship of Retzian-(Ce) to other Species

Structurally related to group(s):
Retzian GroupMn22+REE(AsO4)(OH)4
8.BM.05Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
8.BM.05Retzian-(Nd)Mn22+(Nd,Ce,La)(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
20.4.17Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
20.4.18Retzian-(Nd)Mn22+(Nd,Ce,La)(AsO4)(OH)4

Other Names for Retzian-(Ce)

Name in Other Languages:

Other Information

Other Information:
Soluble in acids.
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-(Ce)

Reference List:
Sjögren (1894) Bulletin of the Geological Institute Upsala: 2: 54 (as Retzian).

Sjögren (1897) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 19 (as Retzian).

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 126.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 794-795 (as Retzian).

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.

American Mineralogist (1982): 67: 841-845.

Internet Links for Retzian-(Ce)

Localities for Retzian-(Ce)

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.
South Africa
 
  • North West Province
    • Bojanala Platinum District
      • Western Bushveld Complex
The Canadian Mineralogist, V 42, 2004, pp. 1169-1178.; R. Liferovich - L. Horváth p.c. (2004)
Sweden
 
  • Värmland
    • Filipstad
      • Nordmark (Nordmarksberg)
Min.Mag.(1978) 42, 133-136
Bull. Geol. Inst. Univ. Upsala (1895): 2, 54-59; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 795.
Mineral and/or Locality  
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