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About AlamositeHide

Also given as Pb12(Si12O36).
Colorless to white, cream, or light gray
Crystal System:
Named after its discovery locality at Alamos, Mun. de Alamos, Sonora, Mexico.
This page provides mineralogical data about Alamosite.

Classification of AlamositeHide

Approved, 'Grandfathered' (first described prior to 1959)

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

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

14 : Silicates not Containing Aluminum
13 : Silicates of Pb

Physical Properties of AlamositeHide

Transparent, Translucent
Colorless to white, cream, or light gray
4½ on Mohs scale

Optical Data of AlamositeHide

Biaxial (-)
RI values:
nα = 1.947 nβ = 1.961 nγ = 1.968
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
relatively weak

Chemical Properties of AlamositeHide


Also given as Pb12(Si12O36).
Common Impurities:

Crystallography of AlamositeHide

Crystal System:
Cell Parameters:
a = 12.24 Å, b = 7.05 Å, c = 11.23 Å
β = 113.12°
a:b:c = 1.736 : 1 : 1.593
Unit Cell V:
891.23 ų (Calculated from Unit Cell)
Crystals fibrous parallel [010] ; as radiating aggregates and balls, to 7.5 cm.

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

Geological EnvironmentHide

Geological Setting:
As a rare secondary mineral in the oxidized zone of lead-bearing base metal deposits.

Type Occurrence of AlamositeHide

Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, 84859, 85509.
Associated Minerals at Type Locality:

Other Language Names for AlamositeHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
10 photos of Alamosite associated with MelanotekitePb2Fe3+2(Si2O7)O2
4 photos of Alamosite associated with LeadhillitePb4(CO3)2(SO4)(OH)2
4 photos of Alamosite associated with KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8
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

Related Minerals - Nickel-Strunz GroupingHide

9.DO.05PyroxmangiteMnSiO3Tric. 1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.13.2PlumbotsumitePb13(CO3)6(Si10O27) · 3H2OOrth.
14.13.3LuddeniteCu2Pb2Si5O14 · 4H2OMon.
14.13.4MolybdophyllitePb8Mg9[Si10O28(OH)8O2(CO3)3] · H2OMon. 2 : B2
14.13.5MargarosanitePb(Ca,Mn2+)2(Si3O9)Tric. 1 : P1
14.13.7KentrolitePb2Mn3+2(Si2O7)O2Orth. mmm (2/m 2/m 2/m) : Pbcm
14.13.9MelanotekitePb2Fe3+2(Si2O7)O2Orth. 2 2 2 : C2 2 21
14.13.10CreaseyitePb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

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.

References for AlamositeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, C., Merwin, H.E. (1909) Alamosite, a new lead silicate from Mexico. American Journal of Science: 27: 399-401.
Boucher, M.L., Donald, P.R. (1968) The crystal structure of alamosite, PbSiO3. Zeitschrift für Kristallographie: 126: 98-111.
Krivovichev, S.V., Burns, P.C. (2004) Crystal structure of synthetic alamosite Pb[SiO3]. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 133(5): 70-76.

Internet Links 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 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.
  • Tarapacá
    • Iquique Province
Zori, C., & Tropper, P. (2013). Silver lining: evidence for Inka silver refining in northern Chile. Journal of Archaeological Science, 40(8), 3282-3292.
  • Hidalgo
    • Zimapán Municipality
      • Zimapán
Panczner, W. D. (1987): Minerals of Mexico. Van Nostrand Reinhold, New York, 459 pp, p.87.; Smith R L, Simons F S, Vlisidis A C (1953) Hidalgoite, a new mineral. American Mineralogist 38, 1218-1224
  • Sonora
    • Álamos Municipality
[Amer.J.Sci., ser. 4 (1909) 27, 399; Clark, 1993 - "Hey's Mineral Index, 3rd Edition"]
  • Oshikoto Region
    • Tsumeb
Medenbach, O., & Schmetzer, K. (1975). Alamosit (PbSiO3) von Tsumeb–ein neuer Fundpunkte= Alamosite from Tsumeb–a new occurrence of PbSiO3. Neues Jahrbuch fur Mineralogie Abhandlungen, 123(2), 138-147.; Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany
  • Viken
    • Lunner
      • Grua
        • Grua mining district
Folvik, H. O. (2013): Alamositt fra Skjerpemyr, Grua, Oppland. Stein. 40 (1), 13
  • Silesian Voivodeship
    • Świętochłowice City County
Tyszka, R., Pietranik, A., Kierczak, J., Zieliński, G., & Darling, J. (2018). Cadmium distribution in Pb-Zn slags from Upper Silesia, Poland: Implications for cadmium mobility from slag phases to the environment. Journal of Geochemical Exploration, 186, 215-224.
  • Värmland County
    • Filipstad
      • Långban Ore District
Nysten, P. (1994): Mineralogiska notiser 3: Alamosit, Långban. Långbansnytt. 10.[ reprinted in: Långbansnytt. De första 20 åren 1983-2003. Långbansällskapet - Skrifter och rapporter. 2, 44]; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
      • Nordmark District
        • Jakobsberg ore field
Nysten, P. (1994): Mineralogiska notiser 3: Alamosit, Långban. Långbansnytt. 10.[ reprinted in: Långbansnytt. De första 20 åren 1983-2003. Långbansällskapet - Skrifter och rapporter. 2, 44]
      • Persberg ore district
        • Pajsberg; Geologiskt Forum 14 (1997)?
  • Districts of Republican Subordination
Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I., Muftakhov, V.A. (2016) Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new cesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine: 81: 113-122.
  • Arizona
    • Cochise County
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 104, 242.
    • Maricopa Co.
      • Osborn Mining District
        • Tonopah
          • Belmont Mountain
            • Tiger Wash
Raman analyzed at the University of Arizona.; Yang, H., Andrade, M.B., Downs, R.T., Gibbs, R.B., Jenkins, R.A. (2016): Raygrantite, Pb10Zn(SO4)6(SiO4)2(OH)2, a new mineral isostructural with iranite, from Big Horn Mountains, Maricopa County, Arizona, USA. Canadian Mineralogist: 54: 625-634.
    • Mohave County
      • Artillery Mountains
        • Artillery Peak
S. A. Williams (1982) Luddenite, a New Copper-Lead Silicate from Arizona Mineralogical Magazine 1982 46 : 363-364
        • Rawhide Wash
          • Rawhide Mine area
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 104, 369; Williams, S.A. (1982), Luddenite, a new copper-lead silicate mineral from AZ, Mineralogical Magazine: 46:363-364.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 280.
    • Pinal Co.
      • Mammoth Mining District
        • Tiger
          • St. Anthony deposit
Analyzed at the University of Western Syndey, Australia.
Mineral and/or Locality  
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