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Swamboite-(Nd)

A valid IMA mineral species
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06312990014948198887285.jpg
Swamboite-(Nd)

Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
01873710014977248825305.jpg
Swamboite-(Nd), etc.

Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
09518860017078756417996.jpg
Swamboite-(Nd)

Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
06312990014948198887285.jpg
Swamboite-(Nd)

Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
03855150014961274129255.jpg
Swamboite-(Nd), etc.

Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
02540230017057845188421.jpg
Swamboite-(Nd)

Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
06312990014948198887285.jpg
Swamboite-(Nd)

Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
01873710014977248825305.jpg
Swamboite-(Nd), etc.

Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
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About Swamboite-(Nd)Hide

Formula:
Nd0.333[(UO2)(SiO3OH)](H2O)~2.5
Colour:
Deep to very pale yellow
Hardness:
2½
Specific Gravity:
4.0
Crystal System:
Monoclinic
Name:
Named after its discovery locality, in the Swambo deposit, Democratic Republic of the Congo (Zaire). Renamed by IMA as Swamboite-(Nd) in 2017.
Originally described as a new mineral with a formula U0.333H2(UO2SiO4)2·10H2O.

The correct formula is: Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5; the formula and name were changed in 2017 (IMA 17-A redefinition/renaming proposal). This makes swamboite-(Nd) the third Nd-U mineral.


Unique IdentifiersHide

Mindat ID:
3843
Long-form identifier:
mindat:1:1:3843:6
GUID
(UUID V4):
2affab6f-1531-41b2-8550-bbce52fe0a8e

IMA Classification of Swamboite-(Nd)Hide

IMA status:
Approved
IMA status notes:
Redefined by the IMA, Renamed by the IMA
IMA Formula:
Nd0.333[(UO2)(SiO3OH)](H2O)~2.5
Approval year:
1981
Approval history:
Redefined and renamed as Swamboite-(Nd) by IMA in febr. 2017 (Proposal 17-A)
Type description reference:
Deliens, M., Piret, P. (1981) La swamboïte, nouveau silicate d'uranium hydraté du shaba, Zaïre. The Canadian Mineralogist, 19 (4) 553-557

Classification of Swamboite-(Nd)Hide

Strunz-mindat (2024):
9.AK.20

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
Dana 8th ed.:
53.3.1.8

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Hey's CIM Ref.:
14.16.4

14 : Silicates not Containing Aluminum
16 : Silicates of U

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
Swa-NdIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Swamboite-(Nd)Hide

Transparency:
Transparent
Colour:
Deep to very pale yellow
Hardness:
2½ on Mohs scale
Cleavage:
Distinct/Good
{201}, good.
Density:
4.0 g/cm3 (Measured)    4.064 g/cm3 (Calculated)

Optical Data of Swamboite-(Nd)Hide

Type:
Biaxial (-)
RI values:
nα = 1.640 nβ = 1.661 nγ = 1.663
2V:
Measured: 30° , Calculated: 32°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v moderate
Pleochroism:
Visible
Comments:
X = colorless; Y = Z = light yellow

Chemistry of Swamboite-(Nd)Hide

Mindat Formula:
Nd0.333[(UO2)(SiO3OH)](H2O)~2.5
Elements listed:
H, Nd, O, Si, U - search for minerals with similar chemistry

Crystallography of Swamboite-(Nd)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 17.64(3) Å, b = 21.00(5) Å, c = 20.12(4) Å
β = 103.42°
Ratio:
a:b:c = 0.84 : 1 : 0.958
Unit Cell V:
7,249.74 ų (Calculated from Unit Cell)
Z:
18
Morphology:
As acicular crystals elongated

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.67 Å(100)
4.75 Å(80)
4.32 Å(80)
3.51 Å(60)
2.979 Å(60b)
5.85 Å(50)
4.49 Å(50)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47f : [Uranyl (U⁶⁺) minerals]

Type Occurrence of Swamboite-(Nd)Hide

Type Locality:
ⓘ Swambo Hill, Kambove Territory, Haut-Katanga, DR Congo
General Appearance of Type Material:
acicular crystals
Place of Conservation of Type Material:
Royal Museum of Central Africa, Tervuren, Belgium, RGM13690.
Associated Minerals at Type Locality:
SoddyiteGypsumCurite
Reference:
Deliens, M. & Piret, P. (1981): La swamboïte, nouveau silicate d'uranium hydraté du shaba, Zaïre. Canadian Mineralogist 19, 553-557

Synonyms of Swamboite-(Nd)Hide

Other Language Names for Swamboite-(Nd)Hide

German:Swamboit
Spanish:Swamboita

Common AssociatesHide

Associated Minerals Based on Photo Data:
15 photos of Swamboite-(Nd) associated with Soddyite(UO2)2SiO4 · 2H2O
2 photos of Swamboite-(Nd) associated with KasolitePb(UO2)(SiO4) · H2O
1 photo of Swamboite-(Nd) associated with UraniniteUO2
1 photo of Swamboite-(Nd) associated with GypsumCaSO4 · 2H2O
1 photo of Swamboite-(Nd) associated with UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
1 photo of Swamboite-(Nd) associated with HeterogeniteCo3+O(OH)
1 photo of Swamboite-(Nd) associated with CuritePb3(H2O)2[(UO2)4O4(OH)3]2

Related Minerals - Strunz-mindat GroupingHide

9.AK.OrlitePb3(UO2)3(Si2O7)2 · 6H2O
9.AK.05Soddyite(UO2)2SiO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Fddd
9.AK.10CuprosklodowskiteCu(UO2)2(SiO3OH)2 · 6H2OTric. 1 : P1
9.AK.10OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca
9.AK.10SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
9.AK.15Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
9.AK.15KasolitePb(UO2)(SiO4) · H2OMon. 2/m : P21/b
9.AK.15NatroboltwooditeNa(UO2)(SiO3OH) · H2OOrth. 2 2 2 : P21 21 21
9.AK.15ParauranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2/m : P21/b
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2OMon. 2/m : P2/b
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2OMon. 2/m : B2/m
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))Orth. mmm (2/m 2/m 2/m)
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2OOrth.
9.AK.40UranosiliteUO3 · 7SiO2Orth.

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.

Internet Links for Swamboite-(Nd)Hide

References for Swamboite-(Nd)Hide

Localities for Swamboite-(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 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Bahia
Pires et al. (2014)
DR Congo (TL)
 
  • Haut-Katanga
    • Kambove Territory
Deliens et al. (1981) +2 other references
USA
 
  • Utah
    • San Juan County
      • White Canyon Mining District
Haynes (2000)
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