Nontronite

Smectite Group.

History

Activities related to discovery and approval of the group members

Structural context

Nontronite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/m
a5.277
b9.14
c9.6—9.78 (9.72)
alpha90
beta90—101 (97.3333)
gamma90
volume463.025—463.04 (463.035)

Based on 4 measurements

Chemical context

Stoichiometric formulas

Nontronite
mindat.org
  • March 13, 2023Na0.3Fe2((Si,Al)4O10)(OH)2·nH2O
IMA
  • March 13, 2023Na0.3Fe3+2(Si,Al)4O10(OH)2 · nH2O
mineralogy.rocks
  • Aug. 30, 2022Na0.3Fe3+2(Si,Al)4O10(OH)2·nH2O

Elements recorded on EPMA

4
Fe
4
O
4
Si
3
H
3
Na
2
Al
1
Ca
1
Mg

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • olive-green
  • yellow-green
        Color noteOriginal color note from the source
        Green, olive-green, yellow-green, yellow, orange, brown
        Lustre
        Resinous
        Waxy
        Dull
        Fracture
        Splintery
        Conchoidal
        Transparency
        Translucent
        Opaque
        Hardness
        1.5—2
        Measured density
        2.2—2.3