Gaidonnayite (original) (raw)
A valid IMA mineral species
About GaidonnayiteHide
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Formula:
Na2Zr(Si3O9) · 2H2O
Colour:
Colourless, may be pale yellow, pale brown to brown, pale grey, gray green.
Crystal System:
Orthorhombic
Name:
Named in honor of Gabrielle/Gaibrielle "Gai" Donnay (née Hamburger) (1920, Landeshut, Silesi, Germany (now Poland) - 4 April 1987, Mont St. Hilaire, Quebec, Canada), chemist, mineralogist and crystallographer. She worked for twenty years at the Geophysical Laboratory, Carnegie Institution of Washington and later at McGill University, Montreal, Canada. For her Ph.D. thesis she solved the complex structure of tourmaline, and later solved numerous other structures. The mineral donnayite-(Y) is also named for her, as well as her husband.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1634:2
f75a0b2b-af98-479c-9041-6599c69f3f22
IMA Classification of GaidonnayiteHide
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IMA Formula:
Na2ZrSi3O9 · 2H2O
Classification of GaidonnayiteHide
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9.DM.15
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
59.2.2.3
59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
14.10.7
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Gdn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of GaidonnayiteHide
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Colour:
Colourless, may be pale yellow, pale brown to brown, pale grey, gray green.
Fracture:
Irregular/Uneven
Density:
2.67 g/cm3 (Measured) 2.70 g/cm3 (Calculated)
Optical Data of GaidonnayiteHide
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RI values:
_n_α = 1.570 - 1.575 _n_β = 1.590 - 1.593 _n_γ = 1.596 - 1.605
δ = 0.026 - 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
Parallel. X = a; Y = b; Z = c.
Pleochroism:
Non-pleochroic
Chemistry of GaidonnayiteHide
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Mindat Formula:
Na2Zr(Si3O9) · 2H2O
Common Impurities:
Ti,Nb,Ca,K
Chemical AnalysisHide
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Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Na1.52K0.40)Σ1.92(Zr0.92Ti0.07Nb0.02)Σ1.01Si3.00O9 · 2H2O |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Brønnebukta, Siktesøya, Porsgrunn, Telemark, Norway | Larsen, Alf Olav, Raade, Gunnar (1991) Gaidonnayite from nepheline syenite pegmatite on Siktesøya in the southern part of the Oslo Region, Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 71 (4) 303-306 | Electron microprobe. H2O by stoichiometry. Empirical formula: Average of 18 electron microprobe analyses, based on 9 O atoms in the hydrous part |
Crystallography of GaidonnayiteHide
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Crystal System:
Orthorhombic
Class (H-M):
m m m _(_2/_m_2/_m_2/m ) - Dipyramidal
Cell Parameters:
a = 11.740 Å, b = 12.820 Å, c = 6.691 Å
Ratio:
a:b:c = 0.916 : 1 : 0.522
Unit Cell V:
1,007.04 ų (Calculated from Unit Cell)
Morphology:
Equant to slightly elongated crystals with wedge-like forms. {010}, {120}, {011}, {100}, {001}. Striated || [001].
Comment:
Non-standard setting P21nb.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005201 | Gaidonnayite | Chao G Y (1985) The crystal structure of gaidonnayite Na2ZrSi3O9.2H2O The Canadian Mineralogist 23 11-15 |  |
1985 | Mont St. Hilaire, Quebec, Canada | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.45 Å | (40) |
| 5.90 Å | (80) |
| 5.64 Å | (60) |
| 3.12 Å | (100) |
| 2.95 Å | (70) |
| 2.83 Å | (40) |
| 2.50 Å | (40) |
| 1.90 Å | (40) |
Geological EnvironmentHide
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Type Occurrence of GaidonnayiteHide
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General Appearance of Type Material:
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Ontario, Canada, numbers T73/2-1, T73/2-2.
Royal Ontario Museum, Toronto, Ontario, Canada, number 34803.
Geological Setting of Type Material:
In miaroles in nepheline syenite and in sltered pegmatite dykes.
Associated Minerals at Type Locality:
Synonyms of GaidonnayiteHide
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Other Language Names for GaidonnayiteHide
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Relationship of Gaidonnayite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of GaidonnayiteHide
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Bright green SW and LW (Mt. St-Hilaire and Norway)
Other InformationHide
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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 GaidonnayiteHide
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References for GaidonnayiteHide
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Localities for GaidonnayiteHide
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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
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- 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). 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.