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Guyanaite

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Merume river, Kamakusa, Mazaruni District, Guyana
© Rick Turner, 2009

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

Classification of Guyanaite

IMA status:Approved
Strunz 8th edition ID:4/F.07-60
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:6.1.2.3

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
Hey's CIM Ref.:7.14.4

7 : Oxides and Hydroxides
14 : Oxides of Cr
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Type Occurrence of Guyanaite

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

Crystallography of Guyanaite

Crystal System:Orthorhombic
Cell Parameters:a = 4.86Å, b = 4.29Å, c = 2.96Å
Ratio:a:b:c = 1.133 : 1 : 0.69
Unit Cell Volume:V 61.71 ų (Calculated from Unit Cell)

Optical Data of Guyanaite

Type:Biaxial
Dispersion:r > v extreme

Chemical Properties of Guyanaite

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

Relationship of Guyanaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FD.05Spertiniite
Cu(OH)
 
2
4.FD.10Bracewellite
CrO(OH)
4.FD.10Diaspore
AlO(OH)
4.FD.10Goethite
α-Fe
3+
 
O(OH)
4.FD.10Groutite
Mn
3+
 
O(OH)
4.FD.10Montroseite
(V,Fe)O(OH)
4.FD.10Tsumgallite
GaO(OH)
4.FD.15Manganite
Mn
3+
 
O(OH)
4.FD.20Yttrotungstite-(Y)
YW
 
2
O
 
6
(OH)
 
3
4.FD.20Yttrotungstite-(Ce)
(Ce,Nd,Y)W
 
2
O
 
6
(OH)
 
3
4.FD.20Unnamed (Nd-analogue of Yttrotungstite-(Ce) )
(Nd,Ce, La)W
 
2
O
 
6
(OH)
 
3
4.FD.25Frankhawthorneite
Cu
 
2
[(OH)
 
2
|TeO
 
4
]
4.FD.30Khinite
Pb
2+
 
Cu
2+
3
(TeO
 
6
)(OH)
 
2
4.FD.30Parakhinite
Pb
2+
 
Cu
2+
3
TeO
 
6
(OH)
 
2
Related Minerals - Hey's Index Grouping:

- +
7.14.1Eskolaite
Cr
 
2
O
 
3
7.14.2Bracewellite
CrO(OH)
7.14.3Grimaldiite
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 Guyanaite

Synonyms:
IMA1967-034
Other Languages:
German:Guyanait
Russian:Гвианаит
Spanish:Guyanaita

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 Guyanaite

Reference List:American Mineralogist: 62: 593.

Internet Links for Guyanaite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Guyanaite in the Natural History Museum (London) online catalogue
  • Guyanaite details from Handbook of Mineralogy (PDF)
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    Localities for Guyanaite

    (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.
    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
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