Mineral - Alamosite
Alamosite
Chemical Properties
Mineral Class
Silicates
Toxicity
high
Formula
PbSiO₃
Unit Cell
a=12.25 b=7.06 c=11.24 β=113° Z=12
Physical Properties
Hardness
4.5
Streak
white
Density
Very Heavy (>6)
Cleavage
Perfect after {010}
Fracture
Tenacity
Optical Properties
Color
whitegray
Birefringence
0.021
Luster
Adamantine
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
P2/m (10)
Habit
fibrous, acicular, radial
Formation
Oxidation zone of lead deposits
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Alamosite
Composition
Elements
Mass
SiO₂
20.01
Al₂O₃
0.09
FeO
0.18
MnO
0.02
PbO
78.95
CaO
0.09
Namibia (Mackay 1952)
Name and first record : Named after the type locality of Álamos in Mexico. Described in 1909 by Charles Palache and Herbert E. Merwin.
Chemistry :
Synonyms :
Varieties :
Abbreviation : Aam
literature
Mackay, A. L. (1952). The unit cell and space group of alamosite (PbSiO3). Mineralogical magazine and journal of the Mineralogical Society , 29 (218), 933-935.