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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Alamosite=1,325.74 barns/electron
U=PE_Alamosite x rElectron 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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Print or Cut-and-Paste your Alamosite Specimen Label here :

Alamosite

PbSiO3
Dana No: 65.07.01.01 Strunz No: 09.DO.20
Locality:

Notes:

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