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Guyanaite

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Formula:
CrO(OH)
Specific Gravity:
4.53-4.81 (Calculated)
Crystal System:
Orthorhombic
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. for the country where the mineral was first found: Guyana / Guiana.
The β phase of CrO(OH). As with other Cr mineral species from the Merume River locality, such as bracewellite, grimaldiite, and mcconnellite, this species is NOT universally present in every specimen and verification of each specimen is required.

A nanophase Fe analogue is known as 'proto-goethite'.


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Classification of GuyanaiteHide

Approved
4.FD.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
D : Hydroxides with OH, without H2O; chains of edge-sharing octahedra
6.1.2.3

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
7.14.4

7 : Oxides and Hydroxides
14 : Oxides of Cr

Pronounciation of GuyanaiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of GuyanaiteHide

Density:
4.53-4.81 g/cm3 (Calculated)

Optical Data of GuyanaiteHide

Type:
Biaxial
Dispersion:
r > v extreme
Comments:
brown colours

Chemical Properties of GuyanaiteHide

Formula:
CrO(OH)
Common Impurities:
Fe,Al,V

Crystallography of GuyanaiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 4.857-4.862 Å, b = 4.295-4.314 Å, c = 2.951-2.958 Å
Ratio:
a:b:c = 1.131 : 1 : 0.687
Unit Cell V:
61.56 ų (Calculated from Unit Cell)
Z:
2
Comment:
Space group is P21nm or Pnnm (LP phase); HP phase: Pnnm

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.224 (vvs)
2.432 (vs)
1.636 (s)
1.719 (ms)
1.609 (ms)
1.516 (ms)
2.524 (m)

Type Occurrence of GuyanaiteHide

General Appearance of Type Material:
microcrystalline aggregates, alluvial grains; very rarely as prismatic crystals, up to 0.1 mm
Geological Setting of Type Material:
In an alluvial placer deposit, in fine-grained intergrowth with other chromium oxide-hydroxide minerals
Associated Minerals at Type Locality:

Synonyms of GuyanaiteHide

Other Language Names for GuyanaiteHide

German:Guyanait
Spanish:Guyanaita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Bracewellite1 photo of Guyanaite associated with Bracewellite on mindat.org.
Grimaldiite1 photo of Guyanaite associated with Grimaldiite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.FD.05SpertiniiteCu(OH)2Orth.
4.FD.10BracewelliteCrO(OH)Orth. mmm (2/m 2/m 2/m)
4.FD.10DiasporeAlO(OH)Orth. mmm (2/m 2/m 2/m)
4.FD.10GroutiteMn3+O(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
4.FD.10Montroseite(V3+,Fe3+)O(OH)Orth.
4.FD.10TsumgalliteGaO(OH)Orth.
4.FD.15ManganiteMn3+O(OH)Mon. 2/m : P21/b
4.FD.20Yttrotungstite-(Y)YW2O6(OH)3
4.FD.20Yttrotungstite-(Ce)(Ce,Nd,Y)W2O6(OH)3Mon. 2 : P21
4.FD.20Unnamed (Nd-analogue of Yttrotungstite-(Ce))(Nd,Ce,La)W2O6(OH)3
4.FD.25FrankhawthorneiteCu2Te6+O4(OH)2Mon.
4.FD.30KhinitePb2+Cu2+3[Te6+O6](OH)2Orth. mm2 : Fdd2
4.FD.30Khinite-3TPb2+Cu2+3Te6+O6(OH)2Trig. 3 : P32

Related Minerals - Dana Grouping (8th Ed.)Hide

6.1.2.1BöhmiteAlO(OH)Orth. mmm (2/m 2/m 2/m)
6.1.2.2Lepidocrociteγ-Fe3+O(OH)Orth. mm2 : Cmc21

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.14.1EskolaiteCr2O3Trig.
7.14.2BracewelliteCrO(OH)Orth. mmm (2/m 2/m 2/m)
7.14.3GrimaldiiteCrO(OH)Trig.
7.14.5YimengiteK(Cr,Ti,Fe,Mg)12O19Hex.
7.14.6Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38Trig.
7.14.7McconnelliteCuCrO2Trig.
7.14.8RedledgeiteBa(Ti4+6Cr3+2)O16Tet.
7.14.9HawthorneiteBaMgTi3Cr4Fe2+2Fe3+2O19Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.14.10ZincochromiteZnCr2O4Iso.
7.14.11Wattersite(Hg+2)2Hg2+(CrO4)O2Mon. 2/m : B2/b
7.14.12ChromiteFe2+Cr3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.14.13MagnesiochromiteMgCr2O4Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

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

References for GuyanaiteHide

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)
Jahn, S., Wunder, B., Koch-Müller, M., Tarrieu, L., Pöhle, M., Watenphul, A., Taran, M.N. (2012): Pressure-induced hydrogen bond symmetrisation in guyanaite, β-CrOOH: evidence from spectroscopy and ab initio simulations. European Journal of Mineralogy: 24(5): 839-850
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for GuyanaiteHide

Localities for GuyanaiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Finland
 
  • Eastern Finland Region
    • Outokumpu Cu-Co-Zn-Ni-Ag-Au ore field
Vuorelainen, Yrjö; Häkli, T.A.; Kataja, M. 1968. A hydrated oxide of chromium as a pseudumorph after eskolaite, Outokumpu, Finland. Bulletin of the Geological Society of Finland n:o 40, p. 125-129, illus.
Guyana (TL)
 
  • Mazaruni District
    • Kamakusa
Geol.Soc.Amer.,Progr.Ann. Meeting (1967) p. 151; MINERALOGICAL MAGAZINE, DECEMBER 1984, VOL. 48, PP. 560 2
  • Upper Takutu-Upper Essequibo Region
    • Omai
Voicu, G., & Bardoux, M. (2002). Geochemical behavior under tropical weathering of the Barama–Mazaruni greenstone belt at Omai gold mine, Guiana Shield. Applied geochemistry, 17(3), 321-336.
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.
USA
 
  • Utah
    • San Juan Co.
Schulze, D. J., Flemming, R. L., Shepherd, P. H., & Helmstaedt, H. (2014). Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah. American Mineralogist, 99(7), 1277-1283.
Mineral and/or Locality  
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