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Grimaldiite

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Formula:
CrO(OH)
Hardness:
3½ - 4½
Crystal System:
Trigonal
Name:
Named in 1967 by Charles Milton, Daniel E. Appleman, Edward Ching-Te Chao, Frank Cuttita, Joseph I. Dinnin, Edward J. Dwornik, Margaret Hall, Blanche L. Ingram, and Harry J. Rose, Jr. in honor of Frank Saverio Grimaldi [October 11, 1915 - April, 1985? Vienna, Virginia, USA], former chief chemist of the U. S. Geological Survey.
Polymorph of:
As with other Cr mineral species from the Merume River locality, such as bracewellite, guyanaite, and mcconnellite this species is NOT universally present in every specimen and verification of each specimen is required.


Classification of Grimaldiite

Approved
4.FE.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
E : Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
6.1.5.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
7.14.3

7 : Oxides and Hydroxides
14 : Oxides of Cr

Physical Properties of Grimaldiite

Hardness:
3½ - 4½ on Mohs scale

Chemical Properties of Grimaldiite

Formula:
CrO(OH)

Crystallography of Grimaldiite

Crystal System:
Trigonal

Type Occurrence of Grimaldiite

Synonyms of Grimaldiite

Other Language Names for Grimaldiite

German:Grimaldiit
Simplified Chinese:格羟铬矿
Spanish:Grimaldiita

Common Associates

Associated Minerals Based on Photo Data:
Mcconnellite3 photos of Grimaldiite associated with Mcconnellite on mindat.org.
Crocoite2 photos of Grimaldiite associated with Crocoite on mindat.org.
Guyanaite1 photo of Grimaldiite associated with Guyanaite on mindat.org.
Bracewellite1 photo of Grimaldiite associated with Bracewellite on mindat.org.
Gold1 photo of Grimaldiite associated with Gold on mindat.org.

Related Minerals - Nickel-Strunz Grouping

4.FE.05Amakinite(Fe2+,Mg)(OH)2
4.FE.05BruciteMg(OH)2
4.FE.05PortlanditeCa(OH)2
4.FE.05PyrochroiteMn(OH)2
4.FE.05TheophrastiteNi(OH)2
4.FE.10BayeriteAl(OH)3
4.FE.10DoyleiteAl(OH)3
4.FE.10GibbsiteAl(OH)3
4.FE.10NordstranditeAl(OH)3
4.FE.15BöhmiteAlO(OH)
4.FE.15Lepidocrociteγ-Fe3+O(OH)
4.FE.20HeterogeniteCo3+O(OH)
4.FE.25FeitknechtiteMn3+O(OH)
4.FE.25Lithiophorite(Al,Li)MnO2(OH)2
4.FE.30QuenselitePbMnO2(OH)
4.FE.35FerrihydriteFe3+10O14(OH)2
4.FE.40FeroxyhyteFe3+O(OH)
4.FE.40Vernadite(Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2O
4.FE.45QuetzalcoatliteZn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y

Related Minerals - Hey's Chemical Index of Minerals Grouping

7.14.1EskolaiteCr2O3
7.14.2BracewelliteCrO(OH)
7.14.4GuyanaiteCrO(OH)
7.14.5YimengiteK(Cr,Ti,Fe,Mg)12O19
7.14.6Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
7.14.7McconnelliteCuCrO2
7.14.8RedledgeiteBa(Ti4+6Cr3+2)O16
7.14.9HawthorneiteBaMgTi3Cr4Fe2+2Fe3+2O19
7.14.10ZincochromiteZnCr2O4
7.14.11Wattersite(Hg+2)2Hg2+(CrO4)O2
7.14.12ChromiteFe2+Cr3+2O4
7.14.13MagnesiochromiteMgCr2O4

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Found in some processing wastes of chromite mills in India.

References for Grimaldiite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 62: 593.
Milton, C., Appleman, D. E., Appleman, M. H., Chao, E. C. T., Cuttitta, F., Dinnin, J. I., Dwornik, E. J., Ingram, B. L. and Rose, H. J., Jr. (1976): Merumite, a complex assemblage of chromium minerals from Guyana. U.S. Geol. Surv. Prof. Paper 887, 1-29 + 6 plates.

Internet Links for Grimaldiite

mindat.org URL:
https://www.mindat.org/min-1750.html
Please feel free to link to this page.

Localities for Grimaldiite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Tasmania
    • West Coast municipality
      • Zeehan district
        • Dundas mineral field
Bottrill, unpub data; Kampf, A. R., Mills, S. J., Housley, R. M., Bottrill, R. S., & Kolitsch, U. (2012). Reynoldsite, Pb2Mn4+ 2 O5 (CrO4), a new phyllomanganate-chromate from the Blue Bell claims, California and the Red Lead mine, Tasmania. American Mineralogist, 97(7), 1187-1192.
Bolivia
 
  • Potosí Department
    • Chayanta Province
      • Pakajake Canyon (Pacajake Canyon)
Petrov, A., Smith, B., Smith, C. (2001) A Guide to Mineral Localities in Bolivia. Mineralogical Record Vol.32(6), pp. 457-482. Livingstone, A., Jackson, B., Davidson, P.J. (1984) Grimaldiite, CrOOH, a second occurrence, from the Hiaca Mine, Colquechaca, Bolivia. Mineraligical Magazine, December 1984, Vol.48, pp. 560-562.
Canada
 
  • Québec
    • Nord-du-Québec
      • Baie-James
        • Otish Mts
Robichaud, L., Lafontaine, J., & White, J. C. (2011). Structural analysis of the Matoush uranium deposit, Quebec. GeoCanada 2010 – Working with the Earth
China
 
  • Yunnan Province
    • Pu'er Prefecture
      • Mojiang Co.
Bingxi Wang (1983): Acta Petrologica Mineralogica et Analytica 2(1), 44-50
Guyana (TL)
 
  • Mazaruni District
    • Kamakusa
Geol.Soc.Amer.,Progr.Ann. Meeting (1967) p. 151; MINERALOGICAL MAGAZINE, DECEMBER 1984, VOL. 48, PP. 560 2
Russia
 
  • Urals Region
    • Middle Urals
      • Permskaya Oblast'
        • Gornozavodskii area
          • Saranovskaya Village (Sarany)
Суставов, С. Г., Шагалов, Е. С., Нурмухаметов, Ф. З., & Главатских, С. П. (2012). ПЕРВАЯ НАХОДКА В РОССИИ ОКСИГИДРАТОВ ХРОМА-ГРИМАЛЬДИТА И ГВИАНАИТА В ЮЖНО-САРАНОВСКОМ ХРОМИТОВОМ МЕСТОРОЖДЕНИИ. Литосфера, (3), 154-159.
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