Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Grimaldiite

Big Photo

Red Lead Mine, Dundas mineral field, Zeehan District, Tasmania, Australia
© Ralph Bottrill

Formula:
CrO(OH)
System:TrigonalHardness:3½ - 4½
Polymorph of:Bracewellite, Guyanaite
This page provides mineralogical data about Grimaldiite.

Classification of Grimaldiite

IMA status:Approved
Strunz 8th edition ID:4/F.07-70
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:6.1.5.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
Hey's CIM Ref.:7.14.3

7 : Oxides and Hydroxides
14 : Oxides of Cr
mindat.org URL:http://www.mindat.org/min-1750.html
Please feel free to link to this page.

Type Occurrence of Grimaldiite

Type Locality:Merume river, Kamakusa, Mazaruni District, Guyana
Year of Discovery:1967

Physical Properties of Grimaldiite

Hardness (Mohs):3½ - 4½

Crystallography of Grimaldiite

Crystal System:Trigonal

Chemical Properties of Grimaldiite

Formula:
CrO(OH)
Essential elements:Cr, H, O
All elements listed in formula:Cr, H, O

Relationship of Grimaldiite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FE.05Amakinite
(Fe
2+
 
,Mg)(OH)
 
2
4.FE.05Brucite
Mg(OH)
 
2
4.FE.05Portlandite
Ca(OH)
 
2
4.FE.05Pyrochroite
Mn(OH)
 
2
4.FE.05Theophrastite
Ni(OH)
 
2
4.FE.10Bayerite
Al(OH)
 
3
4.FE.10Doyleite
Al(OH)
 
3
4.FE.10Gibbsite
Al(OH)
 
3
4.FE.10Nordstrandite
Al(OH)
 
3
4.FE.15Böhmite
AlO(OH)
4.FE.15Lepidocrocite
γ-Fe
3+
 
O(OH)
4.FE.20Heterogenite
CoO(OH)
4.FE.25Feitknechtite
Mn
3+
 
O(OH)
4.FE.25Lithiophorite
(Al,Li)MnO
 
2
(OH)
 
2
4.FE.30Quenselite
PbMnO
 
2
(OH)
4.FE.35Ferrihydrite
Fe
 
5
O
 
3
(OH)
 
9
4.FE.40Feroxyhyte
Fe
3+
 
O(OH)
4.FE.40Vernadite
(Mn
4+
 
,Fe
3+
 
,Ca,Na)(O,OH)
 
2
 · nH
 
2
O
4.FE.45Quetzalcoatlite
Zn
 
6
Cu
 
3
(TeO
 
6
)
 
2
(OH)
 
6
·Ag
 
x
Pb
 
y
Cl
 
x+2y
Related Minerals - Hey's Index Grouping:

- +
7.14.1Eskolaite
Cr
 
2
O
 
3
7.14.2Bracewellite
CrO(OH)
7.14.4Guyanaite
CrO(OH)
7.14.5Yimengite
K(Cr,Ti,Fe,Mg)
 
12
O
 
19
7.14.6Mathiasite
K(Ti,Cr,Fe,Mg,Zr)
 
21
O
 
38
7.14.7Mcconnellite
CuCrO
 
2
7.14.8Redledgeite
Ba
 
x
([Cr,Fe,V]
3+
2x
Ti
 
8-2x
)O
 
16
7.14.9Hawthorneite
BaMgTi
 
3
Cr
 
4
Fe
 
4
O
 
19
7.14.10Zincochromite
ZnCr
 
2
O
 
4
7.14.11Wattersite
(Hg-Hg)
2+
2
Hg
2+
 
[O
 
2
|CrO
 
4
]
7.14.12Chromite
FeCr
 
2
O
 
4
7.14.13Magnesiochromite
MgCr
 
2
O
 
4
7.14.14 Donathite

Other Names for Grimaldiite

Synonyms:
IMA1967-036
Other Languages:
German:Grimaldiit
Russian:Гримальдит
Spanish:Grimaldiita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Grimaldiite

Reference List:American Mineralogist: 62: 593.

Internet Links for Grimaldiite

Search Engines:
  • Look for Grimaldiite on Google
  • Look for Grimaldiite images on Google
    • External Links:
  • Look for Grimaldiite on Webmineral
  • Look for Grimaldiite on Athena Mineralogy
  • Look for Grimaldiite on Wikipedia
  • Look for Grimaldiite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Grimaldiite in the Natural History Museum (London) online catalogue
  • Grimaldiite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Fine Minerals from Dan Weinrich Minerals
  • Fabre Minerals - search for Grimaldiite specimens
  • The Arkenstone - Fine Minerals
  • Edwards Minerals - Fine Specimens
  • Search for - Grimaldiite - on e-Rocks Mineral Sales & Auctions
  • Buy fine minerals and gemstones from Pala International
  • SpiriferMinerals.com - high quality specimens
  • Wilensky Fine Minerals
  • Buy from David K Joyce minerals
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Top quality minerals from Kristalle of California
  • rare and unusual minerals mainly crystallized
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Grimaldiite

    Hide Locality List
    The 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. ? 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
      • Zeehan District
        • Dundas mineral field
    		Bottrill, unpub data
    Bolivia
     
    • Potosí Department
      • Chayanta Province
        • Pakajake Canyon (Pacajake Canyon)
    		[MinRec 32:476]; MINERALOGICAL MAGAZINE, DECEMBER 1984, VOL. 48, PP. 560 2
    Guyana
     
    • Mazaruni District
      • Kamakusa
    		Geol.Soc.Amer.,Progr.Ann. Meeting (1967) p. 151; MINERALOGICAL MAGAZINE, DECEMBER 1984, VOL. 48, PP. 560 2
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 17th Oct 2009 14:32:06