Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
U6+(UO2)6(SiO3OH)6 · 30H2O
Light yellow
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.

Classification of Swamboite-(Nd)

Redefined by the IMA, Renamed by the IMA
Approval Year:
Approval History:
Redefined and renamed as Swamboite-(Nd) by IMA in febr. 2017 (Proposal 17-A)

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)

14 : Silicates not Containing Aluminum
16 : Silicates of U

Physical Properties of Swamboite-(Nd)

Light yellow
Hardness (Mohs):

Optical Data of Swamboite-(Nd)

Biaxial (-)
RI values:
nα = 1.640 nβ = 1.661 nγ = 1.663
Measured: 34° , 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:
r < v moderate

Chemical Properties of Swamboite-(Nd)

IMA Formula:
U6+(UO2)6(SiO3OH)6 · 30H2O
Elements listed in formula:

Crystallography of Swamboite-(Nd)

Crystal System:
Cell Parameters:
a = 17.64 Å, b = 21 Å, c = 20.12 Å
β = 103.42°
a:b:c = 0.84 : 1 : 0.958
Unit Cell Volume:
V 7,249.74 ų (Calculated from Unit Cell)

Type Occurrence of Swamboite-(Nd)

Relationship of Swamboite-(Nd) to other Species

9.AK.05Soddyite(UO2)2SiO4 · 2H2O
9.AK.10CuprosklodowskiteCu(UO2)2(SiO3OH)2 · 6H2O
9.AK.10OursiniteCo(UO2)2(SiO3OH)2 · 6H2O
9.AK.10SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
9.AK.15Boltwoodite(K,Na)UO2(SiO3OH) · 1.5H2O
9.AK.15KasolitePb(UO2)SiO4 · H2O
9.AK.15NatroboltwooditeNa(UO2)(SiO3OH) · H2O
9.AK.15Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.15Beta-UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.25HaiweeiteCa(UO2)2Si5O12(OH)2 · 6H2O
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
9.AK.25RanquiliteCa(UO2)2[Si5O12(OH)2] · 6H2O
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2O
9.AK.30CoutinhoiteThxBa1-2x(UO2)2Si5O13 · 3H2O
9.AK.35UrsiliteMg4(UO2)4(Si2O5)5.5(OH)5 · 13H2O
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2O
14.16.3Soddyite(UO2)2SiO4 · 2H2O
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2O
14.16.6Boltwoodite(K,Na)UO2(SiO3OH) · 1.5H2O
14.16.7NatroboltwooditeNa(UO2)(SiO3OH) · H2O
14.16.8CuprosklodowskiteCu(UO2)2(SiO3OH)2 · 6H2O
14.16.9SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
14.16.10UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
14.16.11Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2O
14.16.12HaiweeiteCa(UO2)2Si5O12(OH)2 · 6H2O
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.17KasolitePb(UO2)SiO4 · H2O
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O
14.16.19OursiniteCo(UO2)2(SiO3OH)2 · 6H2O

Other Names for Swamboite-(Nd)

Name in Other Languages:

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.

References for Swamboite-(Nd)

Reference List:
Deliens, M. & Piret, P. (1981): La swamboïte, nouveau silicate d'uranium hydraté du shaba, Zaïre. Canadian Mineralogist 19, 553-557.

American Mineralogist (1983): 68: 1250.

CNMNC Newsletter No. 36, April 2017, Mineralogical Magazine, 81, 403–409

Internet Links for Swamboite-(Nd) URL:
Please feel free to link to this page.

Localities for Swamboite-(Nd)

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.
Democratic Republic of Congo (Zaïre) (TL)
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Swambo
Canadian Mineralogist(1981) 19, 553-557; Lapis 17(3), 13-40 (1992)
  • Utah
    • San Juan Co.
      • White Canyon District
        • White Canyon
R&M 75:4 p240-248
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: May 26, 2017 01:00:04 Page generated: April 24, 2017 17:13:14
Go to top of page