Alamosite Mineral Data
General Alamosite Information
Chemical Formula:
PbSiO3
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
Empirical Formula:
Pb(SiO3 )
Environment:
As a rare secondary mineral in the oxidized zone of lead-bearing base metal deposits.
IMA Status:
Valid Species (Pre-IMA) 1909
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.
Name Origin:
For the Mexican type locality at Alamos.
Name Pronunciation:
Alamosite + Pronunciation
Synonym:
ICSD 26812
PDF 29-782
Alamosite Image
Images:
Alamosite
Comments: White alamosite crystal group. John Schneider Collection.
Location: Tsumeb, Namibia.
Scale: 3.5x3x2 cm.
© Dan Weinrich
Alamosite Crystallography
Axial Ratios:
a:b:c =1.5919:1:1.7355
Cell Dimensions:
a = 11.209, b = 7.041, c = 12.22, Z = 12; beta = 113.15° V = 886.78 Den(Calc)= 6.37
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/n
X Ray Diffraction:
By Intensity(I/Io ): 2.3(1), 3.34(1), 3.56(0.8),
Physical Properties of Alamosite
Cleavage:
{010} Perfect
Color:
Colorless, White.
Density:
6.49
Diaphaneity:
Transparent to Translucent
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Adamantine
Streak:
white
Optical Properties of Alamosite
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
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
Electron Density:
Bulk Density (Electron Density)=5.50 gm/cc note: Specific Gravity of Alamosite =6.49 gm/cc.
Fermion Index:
Fermion Index = 0.16 Boson Index = 0.84
Photoelectric:
PEAlamosite =1,325.74 barns/electronU=PEAlamosite x r Electron Density=7,289.43 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Alamosite is Not Radioactive
Alamosite Classification
Dana Class:
65.07.01.01 (65) Inosilicate Single-Width Unbranched Chains, W=1
(65.07) with chains P>7
(65.07.01) Dana Group
65.07.01.01 Alamosite PbSiO3 P 2/n 2/m
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
References:
NAME( AntBidBlaNic2) PHYS. PROP.(AmMin, v91, p220) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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
15 - WWW-MINCRYST
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Alamosite
PbSiO3
Dana No: 65.07.01.01 Strunz No: 09.DO.20
Locality:
Notes:
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