Mineral - Andersonite
Andersonite
Chemical Properties
Mineral Class
Carbonates
Toxicity
radioactive
Formula
Na₂Ca(UO₂)(CO₃)₃ · 6H₂O
Unit Cell
a=17.90 c=23.73 Z=18
Physical Properties
Hardness
2.5
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
nd
Tenacity
Brittle
Optical Properties
Color
yellowgreen
Birefringence
0.020
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
ditrigonal-scalenohedral - 3 m
Space Group
R 3 m (166)
Habit
coarse, crusty, massive, Octahedron, pyramidal
Formation
Secondary, in the oxidation zone of uranium-bearing supergene deposits
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Andersonite
Composition
Elements
Mass
SO₃
1.60
CO₂
19.60
UO₃
43.40
MgO
0.50
CaO
8.90
Na₂O
9.30
H₂O
16.70
Arizona (Palache et al. 1952)
Name and first discovery : Named after the American USGS geologist Charles Alfred Anderson (1902-1990), who first described the mineral in 1951.
Chemistry :
Synonyms :
Varieties :
Abbreviation : Anr
literature
Palache, C., Berman, H., & Frondel, C. (1952). Dana's system of mineralogy. Geologiska Föreningen i Stockholm Förhandlingar , 74 (2), 218-219.