Carnotite

Carnotite Group. A secondary mineral resulting from the alteration of Uraninite, Montroseite, or Davidite. Occurs in sandstones, especially in paleochannels, near fossil carbonaceous matter, in calcretes and near playas. Chemically close to vandermeerscheite.

History

Activities related to discovery and approval of the group members

Structural context

Carnotite
Crystal System monoclinicSpace Group P21/c
a5.8952—6.62 (6.3684)
b8.3541—8.403 (8.3757)
c10.4142—10.43 (10.4221)
alpha90
beta100.56—104.2 (102.98)
gamma90
volume504.2—559.922 (541.3347)

Based on 4 measurements

Chemical context

Stoichiometric formulas

Carnotite
mindat.org
  • March 13, 2023K2(UO2)2(VO4)2·3H2O
IMA
  • March 13, 2023K2(UO2)2(VO4)2 · 3H2O
mineralogy.rocks
  • Aug. 30, 2022K2(U6+O2)2(V5+O4)2·3H2O

Elements recorded on EPMA

2
O
2
U
2
V
1
Ag
1
K

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • bright yellow
  • greenish yellow
Color noteOriginal color note from the source
Bright yellow, yellow, greenish yellow
StreakStreak entities, recognized using a custom trained NER model
  • -yellow
Streak noteOriginal streak note from the source
Strontian-yellow
Lustre
Sub-Vitreous
Resinous
Waxy
Silky
Dull
Earthy
Fracture
Micaceous
Transparency
Translucent
Tenacity
fragile
Hardness
2
Calculated density
4.91