VS
Name
—
(K,Na)(UO₂)(SiO₃OH)·1.5H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
3.5–4
Mohs hardness
—
4.7
Specific gravity
—
—
Streak
—
Pearly; radial aggregates vitreous to silky; dull to earthy in microcrystalline pseudomorphs
Luster
—
{010} perfect, {001} imperfect
Cleavage
—
P2_1/m
Space group
—
—
Structural group
—
Bwd · Grandfathered
IMA
—
1956
Named in
—
Pale yellow
Typical colors
—
K · Na · U · O · Si · H
Elements
—