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Retzian-(Nd)

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Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
© 2008, JGW

Formula:
Mn
2+
2
(Nd,Ce,La)(AsO
 
4
)(OH)
 
4
System:OrthorhombicColour:Pinkish brown to reddish ...
Hardness:3 - 4
Name:
Named after Anders Jahon Retzius (1742-1821), Swedish naturalist and Professor of Botany plus the -(Nd) suffix due to the dominance of Nd in the composition.


Retzian Group. Nd analogue of Retzian-(Ce) and Retzian-(La).

Classification of Retzian-(Nd)

IMA status:Approved 1982
Explanation of status:redefinition of retzian, not requiring approval of the Commission
Strunz 8th edition ID:7/B.15-40
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.3.4.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
Hey's CIM Ref.: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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Type Occurrence of Retzian-(Nd)

Type Locality:Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
General Appearance of Type Material:euhedral crystals
Place of Conservation of Type Material:Smithsonian 143762
Geological Setting of type material:Metamorphosed stratiform zinc orebody

Physical Properties of Retzian-(Nd)

Lustre:Vitreous, Dull
Diaphaneity (Transparency):Transparent
Comment:vitreous to dull on crystal faces and vitreous on fracture surfaces
Colour:Pinkish brown to reddish brown
Comment:Darker in center of crystals
Streak:Very light brown
Hardness (Mohs):3 - 4
Cleavage:None Observed
Fracture:Irregular/Uneven
Comment:tends to break along parallel planes
Density (calculated):4.45 g/cm3
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 {P2/b 2/a 2/n}
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:Euhedral crystals with forms {001}, {010), {150}, {130), {110}, {201}, and {021), and is elongate parallel to {001]
Twinning:Radial, spokelike, trillings or sixlings rare

Optical Data of Retzian-(Nd)

Type:Biaxial (+)
RI values: nα = 1.744 nβ = 1.782 nγ = 1.798
2V:Measured: 69° , Calculated: 71°
Maximum Birefringence:δ = 0.054

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v moderate
Pleochroism:Visible
Comments:X= yellow
Y= reddish brown
Z= brown

Chemical Properties of Retzian-(Nd)

Formula:
Mn
2+
2
(Nd,Ce,La)(AsO
 
4
)(OH)
 
4
Essential elements:As, H, Mn, Nd, O
All elements listed in formula:As, Ce, H, La, Mn, Nd, O

Relationship of Retzian-(Nd) to other Species

Member of Group:
Retzian Group:
Mn
2+
2
REE(AsO
 
4
)(OH)
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
8.BM.05Retzian-(Ce)
Mn
2+
2
Ce(AsO
 
4
)(OH)
 
4
8.BM.05Retzian-(La)
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4
8.BM.10Paulkellerite
(BiO)
 
2
Fe
3+
 
[(OH)
 
2
|PO
 
4
]
8.BM.10Kolitschite
PbZn
 
0.5
Fe
 
3
(AsO
 
4
)
 
2
(OH)
 
6
8.BM.15Brendelite
(Bi
3+
 
,Pb)
 
2
(Fe
3+
 
,Fe
2+
 
)[(O,OH)
 
3
|PO
 
4
]
Related Minerals - Hey's Index Grouping:

- +
20.4.1Mansfieldite
AlAsO
 
4
·2H
 
2
O
20.4.2Bulachite
Al
 
2
[(OH)
 
3
|AsO
 
4
] · 3H
 
2
O
20.4.3Alumopharmacosiderite
KAl
 
4
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 6-7H
 
2
O
20.4.4Luetheite
Cu
 
2
Al
 
2
[(OH)
 
2
|AsO
 
4
]
 
2
20.4.5Arsenogoyazite
SrAl
 
3
[(OH)
 
5
|(AsO
 
4
)
 
2
] · H
 
2
O
20.4.6Arsenocrandallite
(Ca,Sr)Al
 
3
[(OH)
 
5
|(AsO
 
4
,PO
 
4
)
 
2
] · H
 
2
O
20.4.7Arsenoflorencite-(Ce)
CeAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.8Arsenoflorencite-(La)
LaAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.9Arsenoflorencite-(Nd)
NdAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.10Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
AsO
 
4
(OH)
 
5
20.4.11Gasparite-(Ce)
(Ce,REE)AsO
 
4
20.4.12Chernovite-(Y)
YAsO
 
4
20.4.13Agardite-(Y)
(Y,Ca)Cu
 
6
[(OH)
 
6
|(AsO
 
4
,HAsO
 
4
)|(AsO
 
4
)
 
2
] · 3H
 
2
O
20.4.14Agardite-(La)
(La,Ce)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.4.15Goudeyite
(Al,Y)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.4.16Retzian-(Ce)
Mn
2+
2
Ce(AsO
 
4
)(OH)
 
4
20.4.17Retzian-(La)
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4

Other Names for Retzian-(Nd)

Synonyms:
Retzian-(Y)
Other Languages:
Russian:Ретциан-(Nd)

Other Information

Health Warning: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.

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    Localities for Retzian-(Nd)

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    The 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. ? 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.
    USA
     
    • 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.
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