Mineral - Boltwoodite
Boltwoodite
Chemical Properties
Mineral Class
Silicates
Toxicity
radioactive
Formula
(K,Na)(UO₂)(SiO₃OH) · 1,5 H₂O
Unit Cell
Physical Properties
Hardness
3.5 - 4
Streak
white
Density
Heavy (3,5-6)
Cleavage
Fracture
Tenacity
Optical Properties
Color
orangeyellow
Birefringence
0.030
Luster
Vitreous,
Pearly,
Waxy
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-sphenoidal - 2
Space Group
P2 1 (4)
Habit
tufty, acicular, radial
Formation
Metasomatose, Pegmatite
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Boltwoodite
Groups and Members
Uranophane-Group