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Margaritasite

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About MargaritasiteHide

Formula:
(Cs,K,H3O)2(UO2)2(VO4)2 · H2O
Colour:
Yellow
Specific Gravity:
5.41 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
For the type locality
Unique combination of elements. The only known Cs vanadate mineral. Also the sixth non-silicate oxysalt mineral with species-defining Cs, after borates londonite and ramanite-(Cs), cesiodymite (sulphate), caesiumpharmacosiderite (arsenate), and mccrillisite (phosphate).


Classification of MargaritasiteHide

Approved
Approval Year:
1980
4.HB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
B : Uranyl Sorovanodates
40.2a.28.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
21.4.5

21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni

Physical Properties of MargaritasiteHide

Transparency:
Translucent
Colour:
Yellow
Density:
5.41 g/cm3 (Calculated)

Optical Data of MargaritasiteHide

Type:
Biaxial (-)
Comments:
α:<1.83 γ:>2.70 Synthetic

Chemical Properties of MargaritasiteHide

Formula:
(Cs,K,H3O)2(UO2)2(VO4)2 · H2O
IMA Formula:
Cs2(UO2)2(VO4)2 · H2O

Crystallography of MargaritasiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 10.514(3) Å, b = 8.425(3) Å, c = 7.252(5) Å
β = 106.01°
Ratio:
a:b:c = 1.248 : 1 : 0.861
Unit Cell V:
617.47 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular crystals to 3 microns, massive.

Type Occurrence of MargaritasiteHide

Place of Conservation of Type Material:
Smithsonian 149090
Geological Setting of Type Material:
Fumarole deposits in rhyolite

Synonyms of MargaritasiteHide

Other Language Names for MargaritasiteHide

Relationship of Margaritasite to other SpeciesHide

Member of:
Other Members of this group:
CarnotiteK2(UO2)2(VO4)2 · 3H2OMon. 2/m : P21/b
MetatyuyamuniteCa(UO2)2(VO4)2 · 3-5H2OOrth. mmm (2/m 2/m 2/m)
MetavanuraliteAl(UO2)2(VO4)2(OH) · 8H2OTric.
SengieriteCu2(UO2)2(VO4)2 · 6H2OMon. 2/m : P21/b
StrelkiniteNa2(UO2)2(VO4)2 · 6H2OOrth.
TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2OOrth. mmm (2/m 2/m 2/m) : Pnna
VanuraliteAl(UO2)2(V2O8)(OH) · 11H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Sklodowskite1 photo of Margaritasite associated with Sklodowskite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.HB.05CarnotiteK2(UO2)2(VO4)2 · 3H2OMon. 2/m : P21/b
4.HB.10SengieriteCu2(UO2)2(VO4)2 · 6H2OMon. 2/m : P21/b
4.HB.15CurienitePb(UO2)2(VO4)2 · 5H2OOrth.
4.HB.15FrancevilliteBa(UO2)2(VO4)2 · 5H2OOrth.
4.HB.15FritzscheiteMn(UO2)2(PO4,VO4)2 · 10H2O (?)Tet.
4.HB.20MetavanuraliteAl(UO2)2(VO4)2(OH) · 8H2OTric.
4.HB.20VanuraliteAl(UO2)2(V2O8)(OH) · 11H2OMon.
4.HB.25MetatyuyamuniteCa(UO2)2(VO4)2 · 3-5H2OOrth. mmm (2/m 2/m 2/m)
4.HB.25TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2OOrth. mmm (2/m 2/m 2/m) : Pnna
4.HB.30StrelkiniteNa2(UO2)2(VO4)2 · 6H2OOrth.
4.HB.35UvaniteU6+2V5+6O21 · 15H2O (?)Orth.
4.HB.40RauviteCa(UO2)2(V10O28) · 16H2O

Related Minerals - Dana Grouping (8th Ed.)Hide

40.2a.28.1CarnotiteK2(UO2)2(VO4)2 · 3H2OMon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

21.4.1UvaniteU6+2V5+6O21 · 15H2O (?)Orth.
21.4.2Vanuranylite(H3O)2(UO2)2(VO4)2 · 4H2O
21.4.3StrelkiniteNa2(UO2)2(VO4)2 · 6H2OOrth.
21.4.4CarnotiteK2(UO2)2(VO4)2 · 3H2OMon. 2/m : P21/b
21.4.6SengieriteCu2(UO2)2(VO4)2 · 6H2OMon. 2/m : P21/b
21.4.7MetatyuyamuniteCa(UO2)2(VO4)2 · 3-5H2OOrth. mmm (2/m 2/m 2/m)
21.4.8TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2OOrth. mmm (2/m 2/m 2/m) : Pnna
21.4.9RauviteCa(UO2)2(V10O28) · 16H2O
21.4.10FrancevilliteBa(UO2)2(VO4)2 · 5H2OOrth.
21.4.11MetavanuraliteAl(UO2)2(VO4)2(OH) · 8H2OTric.
21.4.12VanuraliteAl(UO2)2(V2O8)(OH) · 11H2OMon.
21.4.13CurienitePb(UO2)2(VO4)2 · 5H2OOrth.
21.4.14FritzscheiteMn(UO2)2(PO4,VO4)2 · 10H2O (?)Tet.
21.4.15Palenzonaite(Ca,Na)3CaMn2+2(VO4)3Iso. m3m (4/m 3 2/m) : Ia3d
21.4.16Santafeite(Na,Ca,Sr)12(Mn2+,Fe3+,Al,Mg)8Mn4+8(VO4)16(OH,O)20 · 8H2OOrth. mmm (2/m 2/m 2/m)
21.4.17PyrobelonitePbMn2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
21.4.18BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
21.4.19ČechitePbFe2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m)
21.4.20HeyitePb5Fe2+2(VO4)2O4Mon.
21.4.21MounanaitePbFe3+2(VO4)2(OH,F)2Mon. 2/m : B2/m
21.4.22SchubneliteFe3+VO4 · H2OTric.
21.4.23FervaniteFe3+4V5+4O16 · 5H2OMon.
21.4.24KazakhstaniteFe3+5V4+3V5+12O39(OH)9 · 9H2OMon.
21.4.25Bokite(Al,Fe3+)1.3(V5+,V4+,Fe3+)8O20 · 7.4H2OMon.
21.4.26Rusakovite(Fe3+,Al)5(VO4,PO4)2(OH)9 · 3H2O
21.4.27KolovratiteNixZny(VO4)0.67(x+y) · nH2O

Other InformationHide

Health Risks:
Radioactive

References for MargaritasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1982): 67: 1273-1289.

Internet Links for MargaritasiteHide

Localities for MargaritasiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Mexico (TL)
 
  • Chihuahua
    • Mun. de Aldama
      • Peña Blanca District
        • Sierra Peña Blanca
Amer.Min.(1982) 67, 1273-1289; Panczner(1987): 265 & 392.
Amer.Min.(1982) 67, 1273-1289; Panczner(1987):265 & 392.
Mineral and/or Locality  
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