Alamosite Mineral Data + Say ALAMOSITE

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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 Synonym: Synonym: ICSD 26812
  PDF 29-782
 

Alamosite Image

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Alamosite

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 =1.7369:1:1.5936
Help on Cell Dimensions: Cell Dimensions: a = 12.254, b = 7.055, c = 11.243, Z = 12; beta = 113.15° V = 893.71 Den(Calc)= 6.32
Help on Crystal System: Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Pn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.3(1), 3.34(1), 3.56(0.8),
Click Here for Large Alamosite Structure Window Crystal Structure:

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Boucher M L , Peacor D R , Zeitschrift fur Kristallographie , 126 (1968) p.98-111, The crystal structure of alamosite, PbSiO3, Locality: Alamos, Sonora, Mexico

 

Physical Properties of Alamosite

Help on Cleavage: Cleavage: [010] Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 6.49
Help on Diaphaniety: Diaphaniety: 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= -0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1517,KPDmeas= 0.1477,KC= 0.1489
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:

relectron=5.50 gm/cc
note: rAlamosite =6.49 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.16635
Boson Index = 0.83365
Help on Photoelectric: Photoelectric:

PEAlamosite =1,325.74 barns/electron
U=PEAlamosite x relectron=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: 65.7.1.1 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.7)with chains P>7
  (65.7.1)Dana Group
 
65.7.1.1 Alamosite PbSiO3 Pn m
Help on  Strunz Class: Strunz Class: VIII/F.32-10 VIII - Silicates
  VIII/F - Inosilicates (chain and band) Twelve chains[Si12O36]24-
  VIII/F.32 - Alamosite series
 
VIII/F.32-10 Alamosite PbSiO3 Pn m
 
VIII/F.32-20 Aerinite (Ca,Na)6FeAl(Fe,Mg)2(Al,Mg)6[Si12O36(OH)12H][(H2O)12(CO3)] P 3c1 3m
 

Other Alamosite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Alamosite

PbSiO3
Dana No: 65.7.1.1 Strunz No: VIII/F.32-10
Locality:

 

Notes:

 

 
   
 
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