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Roymillerite

A valid IMA mineral species
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03337030015712292548159.jpg
Roymillerite, etc.

Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia
03337030015712292548159.jpg
Roymillerite, etc.

Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia
03337030015712292548159.jpg
Roymillerite, etc.

Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia
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About RoymilleriteHide

03628700015548429137396.jpg
Roy Miller
Formula:
Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5
Colour:
Colourless to light pink
Lustre:
Vitreous
Specific Gravity:
5.973 (Calculated)
Crystal System:
Triclinic
Name:
Named for dr Roy McG. Miller for his contributions to the knowledge of the Namibia's geology
Chemically quite similar to britvinite; structurally related to britvinite and molybdophyllite. The combination of anion types in roymillerite is unique.

Crystal structure details:
- pyrophyllite-type TOT-modules of the Mg9(OH)8[(Si,Al)10O28] composition
- I-blocks of the Pb24(OH)6O4(CO3)10(BO3,SiO4) composition


Unique IdentifiersHide

Mindat ID:
50357
Long-form identifier:
mindat:1:1:50357:6
GUID
(UUID V4):
13f106d2-1c19-4aae-8960-53f42e8678a2

IMA Classification of RoymilleriteHide

Classification of RoymilleriteHide

Strunz-mindat (2024):
9.EG.70

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings

Mineral SymbolsHide

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

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

Physical Properties of RoymilleriteHide

Lustre:
Vitreous
Transparency:
Transparent
Comment:
strong
Colour:
Colourless to light pink
Cleavage:
Perfect
on (001)
Density:
5.973 g/cm3 (Calculated)

Optical Data of RoymilleriteHide

Type:
Biaxial (-)
RI values:
nα = 1.860(1) nβ = 1.940(1) nγ = 1.940(1)
2V:
Measured: 5° (5)
Max Birefringence:
δ = 0.080
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemistry of RoymilleriteHide

Mindat Formula:
Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5
Elements listed:
B, C, H, Mg, O, Pb, Si - search for minerals with similar chemistry

Crystallography of RoymilleriteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.316(1) Å, b = 9.316(1) Å, c = 26.463(4) Å
α = 83.295(3)°, β = 83.308(3)°, γ = 60.023(2)°
Ratio:
a:b:c = 1 : 1 : 2.841
Unit Cell V:
1971.2 ų
Z:
1
Morphology:
Platy single-crystal grains

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
25.9 Å(100)
13.1 Å(11)
3.480 Å(12)
3.378 Å(14)
3.282 Å(16)
3.185 Å(12)
2.684 Å(16)
2.382 Å(11)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations

Type Occurrence of RoymilleriteHide

Type Locality:
ⓘ Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia
General Appearance of Type Material:
Platy single-crystal grains, up to 1.5 x 0.3 mm in size
Place of Conservation of Type Material:
Cotype: mineralogical collections of the Swedish Museum of Natural History, Stockholm, Sweden (catalogue # 20080176)
Empirical Formula of Type Material:
Pb24.12Mg8.74Mn1.25Fe0.94B1.03Al1.04C9.46Si9.39H14.27O83
Chemical Analysis of Type Material:
MgO4.93 %
MnO1.24 %
FeO0.95 %
PbO75.38 %
B2O30.50 %
Al2O30.74 %
CO25.83 %
SiO27.90 %
H2O1.8 %
Total:99.27 %
Associated Minerals at Type Locality:
SahliniteRhodochrositeMelanotekiteJacobsiteHausmannite
GrootfonteiniteCerussiteBaryte
Reference:
Chukanov, N.V., Aksenov, S.M., Britvin, S.N., Rastsvetaeva, R.K., Belakovskiy, D.I., Van, K.V. (2017): Roymillerite, Pb24Mg9(Si9AlO28)(SiO4)(BO3)(CO3)10(OH)14O4, a new mineral: mineralogical characterization and crystal chemistry. Physics and Chemistry of Minerals: 44: 685-699.

Synonyms of RoymilleriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Roymillerite associated with RhodochrositeMnCO3
1 photo of Roymillerite associated with CerussitePbCO3
1 photo of Roymillerite associated with JacobsiteMn2+Fe3+2O4

Related Minerals - Strunz-mindat GroupingHide

9.EG.05CymriteBaAl2Si2(O,OH)8 · H2OMon. 2 : P21
9.EG.10Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26Mon.
9.EG.10ManganonaujakasiteNa6(Mn2+,Fe2+)Al4Si8O26Mon. 2/m : B2/m
9.EG.15DmisteinbergiteCa(Al2Si2O8)Trig. 3 2 : P3 1 2
9.EG.20KampfiteBa12(Si11Al5)O31(CO3)8Cl5Mon. m
9.EG.25SträtlingiteCa2Al2SiO7 · 8H2OTrig. 3m : R3m
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
9.EG.30Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2OMon.
9.EG.30Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2OMon. 2/m
9.EG.30Tamaite(Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2OMon. 2/m : P21/b
9.EG.35CoombsiteKMn2+13(Si,Al)18O42(OH)14Trig.
9.EG.35ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
9.EG.40Franklinphilite(K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2OTric.
9.EG.40LennilenapeiteK6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2OTric.
9.EG.40Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2OMon. 2/m : B2/m
9.EG.40Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2OTric. 1 : P1
9.EG.40ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27Tric. 1 : P1
9.EG.45Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)Mon. 2 : P21
9.EG.45TuscaniteKCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2OMon. 2/m : P21/b
9.EG.45LevantiteKCa3Al2(SiO4)(Si2O7)(PO4)Mon. 2 : P21
9.EG.50JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex. 6 m2 : P6c2
9.EG.55WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P3 1c
9.EG.60HyttsjöitePb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2OTrig. 3 : R3
9.EG.65ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2OMon. 2/m : B2/m
9.EG.70Britvinite[Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]Tric. 1 : P1
9.EG.75Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b
9.EG.75UM1989-30-SiO:AlBaCaFeHKMgMn(Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O
9.EG.75KayupovaiteNa2Mn10[(Si14Al2)O38(OH)8] · 7H2OMon. 2/m : B2/b

Other InformationHide

IR Spectrum:
Confirms the presence of the britvinite-type tetrahedral sheets, and the complex anions given in the formula
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 RoymilleriteHide

References for RoymilleriteHide

Localities for RoymilleriteHide

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.
Namibia (TL)
 
  • Otjozondjupa Region
    • Otavi Constituency
      • Kombat
Mineralogical Magazine +2 other references
Quick NavTopAbout RoymilleriteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
 
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