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Alamosite Mineral Data

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General Alamosite Information

Help on Chemical  Formula: Chemical Formula: PbSiO3
Help on Composition: Composition: Molecular Weight = 283.28 gm
   Silicon   9.91 %  Si   21.21 % SiO2
   Lead     73.14 %  Pb   78.79 % PbO
   Oxygen   16.94 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb(SiO3)
Help on Environment: Environment: As a rare secondary mineral in the oxidized zone of lead-bearing base metal deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1909
Help on Locality: Locality: From Mexico, in Sonora, at Alamos, and the San Pascual mine, Zimpan, Hidalgo. In the USA, from Arizona, in the Mammoth-St. Anthony mine, at Tiger, Pinal Co., the Lucky Cuss mine, Tomb Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Mexican type locality at Alamos.
Help on Name Pronunciation: Name Pronunciation: Alamosite + Pronunciation Say ALAMOSITE
Help on Synonym: Synonym: ICSD 26812
  PDF 29-782

Alamosite Image

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Comments: White alamosite crystal group. John Schneider Collection.
Location: Tsumeb, Namibia. Scale: 3.5x3x2 cm.
© Dan Weinrich

Alamosite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5919:1:1.7355
Help on Cell Dimensions: Cell Dimensions: a = 11.209, b = 7.041, c = 12.22, Z = 12; beta = 113.15° V = 886.78 Den(Calc)= 6.37
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.3(1), 3.34(1), 3.56(0.8),

Physical Properties of Alamosite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 6.49
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Alamosite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1505,KPDmeas= 0.1477,KC= 0.1489
Ncalc = 1.95 - 1.97
Help on Optical Data: Optical Data: Biaxial (-), a=1.947, b=1.961, g=1.968, bire=0.0210, 2V(Calc)=70, 2V(Meas)=65.

Calculated Properties of Alamosite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.50 gm/cc
note: Specific Gravity of Alamosite =6.49 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEAlamosite =1,325.74 barns/electron
U=PEAlamosite x rElectron Density=7,289.43 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alamosite is Not Radioactive

Alamosite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.07)with chains P>7
  (65.07.01)Dana Group Alamosite PbSiO3 P 2/n 2/m
Help on  Strunz Class: Strunz Class: 09.DO.20 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DO -Inosilicates with 7-, 8-, 10-, 12- and 14-periodic chains
09.DO.20 Alamosite PbSiO3 P 2/n 2/m

Other Alamosite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AmMin, v91, p220) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Alamosite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.DO.20





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