Kenotobermorite

Ca4Si6O15(OH)2(H2O)2 · 3H2O
IMA status
  • Approved
IMA symbol
Ktbm
IMA approved
2014
Also known as
  • Kenotobermoriet

Where it forms, where it's found

Type locality
N'Chwaning II Mine
  1. N'Chwaning Mines
  2. Joe Morolong Local Municipality
  3. John Taolo Gaetsewe District Municipality
  4. Northern Cape
  5. South Africa

-27.1361°, 22.8647°

2recorded occurrences
Source · OpenStreetMap

Crystallography

Crystal system
Monoclinic
Cell parameters
a = 11.265(2) Å · b = 7.386(1) Å · c = 44.970(9) Å
Ratio a:b:c
1 : 0.656 : 3.992
Comment

Spacegroup: F2dd

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen2215.999351.978
50.80%
14SiSiliconSilicon628.085168.510
24.32%
20CaCalciumCalcium440.078160.312
23.14%
1HHydrogenHydrogen121.00812.096
1.74%
Total692.896100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Kenotobermoriet

In other languages

German
Kenotobermorit
Italian
kenotobermorite

Classification

Strunz
10th ed.

9.DG.12

  • 9SilicatesClass
  • 9.DInosilicatesDivision
  • 9.DGInosilicates with 3-periodic single and multiple chainsGroup
  • 9.DG.12KenotobermoriteSpecies

Group, growth & confusion

In the same group
1 members
Commonly confused with
1 mineral

Literature, links & citation

Citations
  1. 2001Merlino, Stefano, Bonaccorsi, Elena, Armbruster, Thomas (2001) The real structure of tobermorite 11A: normal and anomalous forms, OD character and polytypic modifications. European Journal of Mineralogy, 13 (3) 577-590 doi:10.1127/0935-1221/2001/0013-0577DOI: 10.1127/0935-1221/2001/0013-0577
  2. 2014Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2014) New minerals and nomenclature modifications approved in 2014, CNMNC Newsletter No 21. Mineralogical Magazine, 78 (4) 797-804 doi:10.1180/minmag.2014.078.4.03DOI: 10.1180/minmag.2014.078.4.03
  3. 2015Biagioni, Cristian, Merlino, Stefano, Bonaccorsi, Elena (2015) The tobermorite supergroup: a new nomenclature. Mineralogical Magazine, 79 (2) 485-495 doi:10.1180/minmag.2015.079.2.22DOI: 10.1180/minmag.2015.079.2.22
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Kenotobermorite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/kenotobermorite-46180},
  note      = {Accessed 2026-05-11}
}