Grguricite

CaCr2(CO3)2(OH)4 · 4H2O
IMA status
  • Approved
IMA symbol
Ggu
Also known as
  • Grguriciet

Where it forms, where it's found

Geological setting

Pb-Ba-V mineralization

Type locality
Adeghoual (Aderhoual)
  1. Mibladen
  2. Aït Oufella Caïdat
  3. Midelt Cercle
  4. Midelt Province
  5. Drâa-Tafilalet Region
  6. Morocco

32.7306°, -4.6967°

2recorded occurrences
Source · OpenStreetMap

Physical

Colour
lilac

Crystallography

Crystal system
Triclinic
Space group
#2
Cell parameters
a = 5.724(2) Å · b = 6.5304(9) Å · c = 14.646(4) Å
Cell angles
α = 81.682(1) ° · β = 83.712(2) ° · γ = 86.365(2) °
Ratio a:b:c
1 : 1.141 : 2.559
Type-locality form

crusts comprising very fine-grained crystalline aggregates

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen1415.999223.986
55.42%
24CrChromiumChromium251.996103.992
25.73%
20CaCalciumCalcium140.07840.078
9.92%
6CCarbonCarbon212.01124.022
5.94%
1HHydrogenHydrogen121.00812.096
2.99%
Total404.174100.00%

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

From IMA formula

Synonyms

  • Grguriciet

In other languages

German
Grguricit · IMA 2019-123

Classification

Strunz
10th ed.

5.DB

  • 5CarbonatesClass
  • 5.DCarbonates with additional anions, with H2ODivision
  • 5.DBWith large and medium-sized cationsGroup
  • 5.DBGrguriciteSpecies

Group, growth & confusion

Literature, links & citation

Citations
  1. 2020Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2020) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) - Newsletter 54. European Journal of Mineralogy, 32 (2) 275-283 doi:10.5194/ejm-32-275-2020 DOI: 10.5194/ejm-32-275-2020
  2. 2020Rumsey, Michael S., Welch, Mark D., Spratt, John, Kleppe, Annette K. (2020) Grguricite, CaCr2(CO3)2(OH)4.4H2O, a new alumohydrocalcite analogue. Mineralogical Magazine, 84 (5). 778-784 doi:10.1180/mgm.2020.66DOI: 10.1180/mgm.2020.66
  3. 2022(2022) Grguricite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Grguricite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/grguricite-54365},
  note      = {Accessed 2026-05-11}
}