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Gayite

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About GayiteHide

Formula:
NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O
Colour:
greenish black
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
3.15
Crystal System:
Monoclinic
Name:
For Hebe Dina Gay (b. 1927), Professor Emeritus of Mineralogy of the National University of Cordoba (Argentina).
Dufrénite Group. The Mn2+-analogue of natrodufrénite.

Visually it is very similar to dufrénite and can only be distinguished with certainty by chemical analyses or X-ray diffraction


Classification of GayiteHide

Approved
Approval Year:
2009
8.DK.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
42.9.1.5

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O

Pronounciation of GayiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of GayiteHide

Vitreous
Transparency:
Transparent
Colour:
greenish black
Streak:
olive green
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100}
Parting:
none
Fracture:
Irregular/Uneven
Density:
3.15(5) g/cm3 (Measured)    3.245 g/cm3 (Calculated)

Optical Data of GayiteHide

Type:
Biaxial (+)
RI values:
nα = 1.787(3) nβ = 1.792(3) nγ = 1.806(3)
2V:
Measured: 60° (5), Calculated: 62.1°
Max Birefringence:
δ = 0.019
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v
Pleochroism:
Strong
Comments:
strong with X (bluish-green) >>Z (orange) > Y (yellow).

Chemical Properties of GayiteHide

Formula:
NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O
IMA Formula:
NaMnFe5(PO4)4(OH)6 · 2H2O

Crystallography of GayiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 25.975(3) Å, b = 5.1766(4) Å, c = 13.929(11) Å
β = 111.293(2)°
Ratio:
a:b:c = 5.018 : 1 : 2.691
Unit Cell V:
1,745.07 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.045 (60)
4.147 (37)
3.424 (71)
3.179 (100)
2.881 (42)
2.426 (36)
2.109 (39)
1.585 (50)

Type Occurrence of GayiteHide

General Appearance of Type Material:
Tabular crystals reach 130 µm on edge and are often grouped, sometimes as curved, worm-like aggregates up to about 1 mm long composed of clusters of subparallel crystals.
Place of Conservation of Type Material:
Cotype material is deposited in the Natural History Museum of Los Angeles County, California (specimen no. 59843), and in the Museo de Mineralogía “Dr. Alfred Stelzner,” Universidad Nacional de Córdoba, Argentina (specimen no. MS003278).
Geological Setting of Type Material:
granitic pegmatite with triplite masses.
Associated Minerals at Type Locality:

Synonyms of GayiteHide

Relationship of Gayite to other SpeciesHide

Other Members of this group:
BurangaiteNaFe2+Al5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
MatioliiteNaMgAl5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
NatrodufréniteNaFe2+Fe3+5(PO4)4(OH)6 · 2H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Variscite3 photos of Gayite associated with Variscite on mindat.org.
Apatite1 photo of Gayite associated with Apatite on mindat.org.
Saléeite1 photo of Gayite associated with Saléeite on mindat.org.
Gordonite1 photo of Gayite associated with Gordonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DK.RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2OMon. 2/m
8.DK.10BariopharmacosideriteBa0.5Fe3+4(AsO4)3(OH)4 · 5H2OTet. 4 2m : P4 2m
8.DK.10PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
8.DK.10Natropharmacosiderite(Na,K)Fe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
8.DK.10Hydroniumpharmacosiderite(H3O)Fe4(AsO4)3(OH)4 · 4H2OIso. 4 3m : P4 3m
8.DK.12PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2OIso. 4 3m : P4 3m
8.DK.12NatropharmacoalumiteNaAl4(AsO4)3(OH)4 · 4H2OIso. 4 3m : P4 3m
8.DK.12BariopharmacoalumiteBa0.5Al4(AsO4)3(OH)4 · 4H2OIso. 4 3m : P4 3m
8.DK.15BurangaiteNaFe2+Al5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
8.DK.15DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
8.DK.15NatrodufréniteNaFe2+Fe3+5(PO4)4(OH)6 · 2H2OMon.
8.DK.15MatioliiteNaMgAl5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
8.DK.20KidwelliteNaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33Mon. 2/m : P2/b
8.DK.25Bleasdaleite(Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13Mon.
8.DK.30Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2OMon.
8.DK.35KrasnoviteBa(Al,Mg)(PO4,CO3)(OH)2 · H2OOrth.

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

42.9.1.1BurangaiteNaFe2+Al5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
42.9.1.2DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
42.9.1.3NatrodufréniteNaFe2+Fe3+5(PO4)4(OH)6 · 2H2OMon.

Fluorescence of GayiteHide

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 GayiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Colombo, F., González del Tánago, J. (2010): Gayite, a new dufrénite-group mineral from the Gigante granitic pegmatite, Córdoba province, Argentina. American Mineralogist, 95, 386–391.

Internet Links for GayiteHide

Localities for GayiteHide

ⓘ - 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.
Argentina (TL)
 
  • Córdoba
    • Punilla Department
Kampf, A.R., Colombo, F., González del Tánago, J. (2010): Gayite, a new dufrénite-group mineral from the Gigante granitic pegmatite, Córdoba province, Argentina. American Mineralogist, 95, 386–391.; Kampf, A.R., F. Colombo, W.B. Simmons Jr., A. Falster, J.W. Nizamoff (2010): Galliskiite, Ca4Al2(PO4)2F8 x 5H2O, a new mineral from the Gigante granitic pegmatite, Cordoba province, Argentina. American Mineralogist. 95, 392-96
Brazil
 
  • Minas Gerais
    • Galiléia
      • Sapucaia do Norte
Sergio Varvello collection
Czech Republic
 
  • Vysočina Region
    • Žďár nad Sázavou District
      • Křižanov
ŠKODA R., STANĚK J., Gayite from granitic pegmatite at Cyrilov near Velké Meziříčí, Moldanubicum. Acta Mus. Moraviae, Sci. geol., Brno: MZM Brno, 95, 2s. 87-180. ISSN 1211-8796. 2010.
Portugal
 
  • Viseu District
    • Sátão
      • Ferreira de Aves
        • Aldeia Nova
Pedro Alves collection and analytical data
Mineral and/or Locality  
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