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Alamosite

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Formula:
Pb12[Si12O36]
System:
Monoclinic
Colour:
Colorless to white, ...
Hardness:
Name:
Named after its discovery locality at Alamos, Mun. de Alamos, Sonora, Mexico.
This page provides mineralogical data about Alamosite.

Classification of Alamosite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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Type Occurrence of Alamosite

Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, 84859, 85509.
Year of Discovery:
1909
Associated Minerals at Type Locality:

Occurrences of Alamosite

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

Physical Properties of Alamosite

Adamantine
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colorless to white, cream, or light gray
Streak:
white
Hardness (Mohs):
Cleavage:
Perfect
{010}

Crystallography of Alamosite

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

Optical Data of Alamosite

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

Chemical Properties of Alamosite

Formula:
Pb12[Si12O36]
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Fe,Mn,Ca

Relationship of Alamosite to other Species

9.DO.05Pyroxferroite(Fe,Mn,Ca)SiO3
9.DO.05PyroxmangiteMnSiO3
9.DO.10PellyiteBa2Ca(Fe,Mg)2Si6O17
9.DO.15Nordite-(Ce)(Ce,La)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
9.DO.15Nordite-(La)(La,Ce)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
9.DO.15Ferronordite-(Ce)Na3SrCeFe2+Si6O17
9.DO.15Manganonordite-(Ce)Na3SrCeMn2+Si6O17
9.DO.15Ferronordite-(La)Na3Sr(La,Ce)FeSi6O17
9.DO.25LiebauiteCa3Cu5Si9O26
14.13.2PlumbotsumitePb13(CO3)6(Si10O27) · 3H2O
14.13.3LuddeniteCu2Pb2Si5O14 · 4H2O
14.13.4MolybdophyllitePb8Mg9[Si10O28(OH)8|O2|(CO3)3] · H2O
14.13.5MargarosanitePb(Ca,Mn2+)2(Si3O9)
14.13.6GanomalitePb9Ca5Mn(Si2O7)4(SiO4)O
14.13.7KentrolitePb2Mn23+(Si2O7)O2
14.13.8BarysilitePb8Mn2+[Si2O7]3
14.13.9MelanotekitePb2Fe23+(Si2O7)O2
14.13.10CreaseyitePb2Cu2Fe23+(Si4.67Al0.33)O15.33(OH)3 · H2O

Other Names for Alamosite

Name in Other Languages:
German:Alamosit
Spanish:Alamosita

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 Alamosite

Reference List:
Zeitschrift für Kristallographie: 126: 98-111.

Internet Links for Alamosite

Localities for Alamosite

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.
Mexico
 
  • Hidalgo
    • Mun. de Zimapán
      • Zimapán
Panczner, W. D. (1987): Minerals of Mexico. Van Nostrand Reinhold, New York, 459 pp, p.87.
  • Sonora
    • Mun. de Álamos
[Amer.J.Sci., ser. 4 (1909) 27, 399; Clark, 1993 - "Hey's Mineral Index, 3rd Edition"]
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany
Norway
 
  • Oppland
    • Lunner
      • Grua
        • Grua Mining District
Folvik, H. O. (2013): Alamositt fra Skjerpemyr, Grua, Oppland. Stein. 40 (1), 13
Sweden
 
  • Värmland
    • Filipstad
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.
      • Persberg district
        • Pajsberg
http://www.geonord.se/langban/LBS_web/Harstigen.htm
USA
 
  • Arizona
    • Cochise Co.
      • Tombstone Hills
        • Tombstone District
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 104, 242.
    • Maricopa Co.
      • Big Horn Mts
        • Osborn District
          • Tonopah
            • Belmont Mountain
              • Tiger Wash
Raman analyzed at the University of Arizona.
    • Mohave Co.
      • Artillery Mts
        • Artillery Peak
S. A. Williams (1982) Luddenite, a New Copper-Lead Silicate from Arizona Mineralogical Magazine 1982 46 : 363-364
        • Rawhide Wash
http://www.mindat.org/mesg-7-84077.html
          • 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, Min.Mag.: 46:363-364.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 280.
    • Pinal Co.
      • Mammoth District
        • Tiger
          • St. Anthony deposit
Analyzed at the University of Western Syndey, Australia.
Mineral and/or Locality  
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