Gayite
A valid IMA mineral species
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About Gayite
Hebe D. Gay
Formula:
NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O
Colour:
greenish black
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
3.15
Crystal System:
Monoclinic
Member of:
Name:
Named in honor of Hebe Dina Gay (26 January 1927, Río Cuarto, Cordoba, Argentina - 25 June 2018, Cordoba, Argentina), Professor of Mineralogy of the National University of Cordoba, Argentina. She curated the University’s Alfredo Stelzner Museum of Mineralogy and Geology for many years, building it into an important collection. She studied the pegmatites of the Punilla Department and their phosphate minerals, co-authoring the description of benyacarite.
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
Visually it is very similar to dufrénite and can only be distinguished with certainty by chemical analyses or X-ray diffraction
Unique Identifiers
Mindat ID:
39302
Long-form identifier:
mindat:1:1:39302:1
GUID
(UUID V4):
(UUID V4):
16855601-9dcd-4dc4-8f2c-64b4cf0a5f40
IMA Classification of Gayite
Approved
IMA Formula:
NaMnFe5(PO4)4(OH)6 · 2H2O
Approval year:
2009
First published:
2010
Classification of Gayite
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
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
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Gy | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Gayite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Gayite
Vitreous
Transparency:
Transparent
Colour:
greenish black
Streak:
olive green
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100}
{100}
Parting:
none
Fracture:
Irregular/Uneven
Density:
3.15(5) g/cm3 (Measured) 3.245 g/cm3 (Calculated)
Optical Data of Gayite
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.
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).
Chemistry of Gayite
Mindat Formula:
NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O
Crystallography of Gayite
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)°
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
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005031 | Gayite | Kampf A R, Colombo F, Gonzalez del Tanago J (2010) Gayite, a new dufrenite-group mineral from the Gigante granitic pegmatite, Cordoba province, Argentina Cordoba province, Argentina American Mineralogist 95 386-391 |  | 2010 | Gigante granitic pegmatite, Punilla department, | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.045 Å | (60) |
| 4.147 Å | (37) |
| 3.424 Å | (71) |
| 3.179 Å | (100) |
| 2.881 Å | (42) |
| 2.426 Å | (36) |
| 2.109 Å | (39) |
| 1.585 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Gayite
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:
Reference:
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.
Synonyms of Gayite
Relationship of Gayite to other Species
Member of:
Other Members of this group:
| Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Burangaite | NaFe2+Al5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Natrodufrénite | NaFe2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
Common Associates
Associated Minerals Based on Photo Data:
| 5 photos of Gayite associated with Morinite | NaCa2Al2(PO4)2(OH)F4 · 2H2O |
| 3 photos of Gayite associated with Fluorapatite | Ca5(PO4)3F |
| 3 photos of Gayite associated with Variscite | AlPO4 · 2H2O |
| 1 photo of Gayite associated with Apatite | Ca5(PO4)3(Cl/F/OH) |
| 1 photo of Gayite associated with Saléeite | Mg(UO2)2(PO4)2 · 10H2O |
| 1 photo of Gayite associated with Gordonite | MgAl2(PO4)2(OH)2 · 8H2O |
Related Minerals - Strunz-mindat Grouping
| 8.DK. | Richelsdorfite | Ca2Cu5Sb(AsO4)4(OH)6Cl · 6H2O |
| 8.DK. | Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK. | Puttapaite | Pb2Mn2+2ZnCr3+4O2(AsO4)4(OH)6 · 12H2O |
| 8.DK.10 | Bariopharmacosiderite | Ba0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Pharmacosiderite | KFe3+4(AsO4)3(OH)4 · 6-7H2O |
| 8.DK.10 | Natropharmacosiderite | NaFe3+4(AsO4)3(OH)4 · 4H2O |
| 8.DK.10 | Hydroniumpharmacosiderite | (H3O)Fe4(AsO4)3(OH)4 · 4H2O |
| 8.DK.10 | Strontiopharmacosiderite | Sr0.5Fe4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Thalliumpharmacosiderite | TlFe4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Plumbopharmacosiderite | Pb0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.12 | Pharmacoalumite | KAl4(AsO4)3(OH)4 · 6.5H2O |
| 8.DK.12 | Natropharmacoalumite | NaAl4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Bariopharmacoalumite | Ba0.5Al4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Hydroniumpharmacoalumite | (H3O)Al4(AsO4)3(OH)4 · 4.5H2O |
| 8.DK.15 | Burangaite | NaFe2+Al5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Natrodufrénite | NaFe2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O |
| 8.DK.20 | Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
| 8.DK.25 | Bleasdaleite | (Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13 |
| 8.DK.30 | Matulaite | (Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O |
| 8.DK.35 | Krasnovite | Ba(Al,Mg)(PO4,CO3)(OH)2 · H2O |
Fluorescence of Gayite
none
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.
Internet Links for Gayite
mindat.org URL:
https://www.mindat.org/min-39302.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Gayite
Reference List:
Localities for Gayite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Argentina (TL) | |
| Kampf et al. (2010) +1 other reference |
Brazil | |
| Sergio Varvello collection |
Czech Republic | |
| ŠKODA R. |
Portugal | |
| Pedro Alves collection and analytical ... |
Spain | |
| Calvo Rebollar et al. (2022) |
Quick NavTopAbout GayiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsRelationshipsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Gigante pegmatite, Candelaria District, Cruz del Eje department, Córdoba Province, Argentina