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Alamosite

A valid IMA mineral species - grandfathered
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About AlamositeHide

Formula:
PbSiO3
Also given as Pb12(Si12O36).
Colour:
Colorless to white, cream, or light gray
Lustre:
Adamantine
Hardness:
Specific Gravity:
6.488
Crystal System:
Monoclinic
Name:
Named after its discovery locality at Alamos, Mun. de Alamos, Sonora, Mexico.
This page provides mineralogical data about Alamosite.


Unique IdentifiersHide

Mindat ID:
93
Long-form identifier:
mindat:1:1:93:8
GUID
(UUID V4):
8f20d8d5-9286-4e5c-a468-f7d22561375b

IMA Classification of AlamositeHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1909

Classification of AlamositeHide

9.DO.20

9 : SILICATES (Germanates)
D : Inosilicates
O : Inosilicates with 7-, 8-, 10-, 12- and 14-periodic chains
65.7.1.1

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
7 : Single-Width Unbranched Chains, W=1 with chains P > 7
14.13.1

14 : Silicates not Containing Aluminum
13 : Silicates of Pb

Mineral SymbolsHide

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

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

Physical Properties of AlamositeHide

Adamantine
Transparency:
Transparent, Translucent
Colour:
Colorless to white, cream, or light gray
Streak:
White
Hardness:
4½ on Mohs scale
Cleavage:
Perfect
{010}
Density:
6.488(2) g/cm3 (Measured)    6.30 g/cm3 (Calculated)

Optical Data of AlamositeHide

Type:
Biaxial (-)
RI values:
nα = 1.947 nβ = 1.961 nγ = 1.968
2V:
Measured: 65° , Calculated: 70°
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively weak

Chemistry of AlamositeHide

Mindat Formula:
PbSiO3

Also given as Pb12(Si12O36).
Common Impurities:
Al,Fe,Mn,Ca

Crystallography of AlamositeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
Setting:
P2/m
Cell Parameters:
a = 12.247 Å, b = 7.059 Å, c = 11.236 Å
β = 113.12°
Ratio:
a:b:c = 1.735 : 1 : 1.592
Unit Cell V:
893.35 ų (Calculated from Unit Cell)
Z:
12
Morphology:
Crystals fibrous parallel [010]; as radiating aggregates and balls, to 7.5 cm.
Comment:
P2/n

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0010657AlamositeBoucher M L, Peacor D R (1968) The crystal structure of alamosite, PbSiO3 Zeitschrift fur Kristallographie 126 98-1111968Alamos, Sonora, Mexico0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.34 Å(100)
3.56 Å(95)
3.53 Å(75)
2.300 Å(75)
3.23 Å(70)
2.987 Å(70)
3.25 Å(60)
Comments:
Tsumeb, Namibia.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47h : [Near-surface oxidized, dehydrated minerals]
Geological Setting:
As a rare secondary mineral in the oxidized zone of lead-bearing base metal deposits.

Type Occurrence of AlamositeHide

General Appearance of Type Material:
Radiating fibrous spheres.
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, 84859, 85509.
Associated Minerals at Type Locality:
Reference:
Palache, C., Merwin, H.E. (1909) Alamosite, a new lead silicate from Mexico. American Journal of Science: 27: 399-401.

Other Language Names for AlamositeHide

German:Alamosit
Spanish:Alamosita

Common AssociatesHide

Associated Minerals Based on Photo Data:
18 photos of Alamosite associated with MelanotekitePb2Fe3+2(Si2O7)O2
10 photos of Alamosite associated with KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8
4 photos of Alamosite associated with LeadhillitePb4(CO3)2(SO4)(OH)2
2 photos of Alamosite associated with WillemiteZn2SiO4
2 photos of Alamosite associated with HematiteFe2O3
2 photos of Alamosite associated with Calcium-bearing Queitite(Pb,Ca)4Zn2(SO4)(SiO4)(Si2O7)
2 photos of Alamosite associated with GanomalitePb9Ca5Mn(Si2O7)4(SiO4)O
2 photos of Alamosite associated with QuartzSiO2
1 photo of Alamosite associated with LuddeniteCu2Pb2Si5O14 · 4H2O
1 photo of Alamosite associated with ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1

Related Minerals - Strunz-mindat GroupingHide

9.DO.BraccoiteNaMn2+5[Si5As5+O17(OH)](OH)Tric. 1 : P1
9.DO.Illoqite-(Ce)Na2NaBaCeZnSi6O17Orth. mmm (2/m 2/m 2/m) : Pcca
9.DO.05Pyroxferroite(Fe,Mn,Ca)SiO3Tric.
9.DO.05PyroxmangiteMn2+SiO3Tric. 1 : P1
9.DO.10PellyiteBa2Ca(Fe,Mg)2Si6O17Orth. mmm (2/m 2/m 2/m)
9.DO.15Nordite-(Ce)(Ce,La)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17Orth. mmm (2/m 2/m 2/m) : Pcca
9.DO.15Nordite-(La)(La,Ce)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17Orth. mmm (2/m 2/m 2/m) : Pcca
9.DO.15Ferronordite-(Ce)Na3SrCeFe2+Si6O17Orth. mmm (2/m 2/m 2/m) : Pcca
9.DO.15Manganonordite-(Ce)Na3SrCeMn2+Si6O17Orth. mmm (2/m 2/m 2/m) : Pcca
9.DO.15Ferronordite-(La)Na3Sr(La,Ce)FeSi6O17Orth.
9.DO.15MeieraniteNa2Sr3MgSi6O17Orth.
9.DO.25LiebauiteCa3Cu5Si9O26Mon. 2/m : B2/b
9.DO.30VladykiniteNa3Sr4(Fe2+Fe3+)Si8O24 Mon. 2/m : P21/b

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 AlamositeHide

References for AlamositeHide

Localities for AlamositeHide

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.
Canada
 
  • Québec
    • Abitibi-Témiscamingue
      • Rouyn-Noranda TE
Caplette et al. (2015)
Chile
 
  • Tarapacá
    • Tamarugal Province
Zori et al. (2013)
Germany
 
  • Bavaria
    • Upper Palatinate
      • Neustadt an der Waldnaab District
        • Pressath
Dill (2008)
Mexico
 
  • Hidalgo
    • Zimapán Municipality
      • Zimapán
Smith et al. (1953) +1 other reference
  • Sonora
    • Álamos Municipality
[Amer.J.Sci. (1909) +1 other reference
Namibia
 
  • Oshikoto Region
    • Tsumeb
Medenbach et al. (1975) +1 other reference
Norway
 
  • Viken
    • Lunner
      • Grua
        • Grua mining district
Folvik (2013)
Poland
 
  • Silesian Voivodeship
    • Świętochłowice
Tyszka et al. (2018)
Sweden
 
  • Värmland County
    • Filipstad
      • Långban Ore District
Holtstam et al. (1999) +1 other reference
      • Nordmark mining district
        • Jakobsberg ore field
Nysten (2003) +1 other reference
      • Persberg ore district
        • Pajsberg
The Harstigen mine +1 other reference
Tajikistan
 
  • Districts of Republican Subordination
Agakhanov et al. (2017) +1 other reference
USA
 
  • Arizona
    • Cochise County
      • Tombstone Mining District
Anthony et al. (1995)
    • Maricopa County
      • Osborn Mining District
        • Tonopah
          • Tiger Wash
Raman analyzed at the University of ... +1 other reference
    • Mohave County
      • Artillery Mountains
        • Artillery Peak
Williams (1982)
        • Rawhide Wash
www.mindat.org (n.d.)
            • Rawhide mine area
Williams (1982) +1 other reference
Anthony et al. (1995)
    • Pinal County
      • Mammoth Mining District
        • Tiger
          • St. Anthony deposit
Analyzed at the University of Western ...
 
Mineral and/or Locality  
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