Georgechaoite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Georgechaoite
Dr. George Y. Chao
Formula:
NaKZr[Si3O9] · 2H2O
Colour:
Colorless, white
Hardness:
5
Specific Gravity:
2.70
Crystal System:
Orthorhombic
Name:
Named in honor of George Yanji Chao (1930 - 2 May 2022, Ottawa, Ontario, Canada), Professor of Mineralogy (1963-1995), Carleton University, Ottawa, in recognition of his work on zirconium silicates. Chao was the leading investigator of the mineralogy of Mont Saint-Hilaire for many years, describing or participating in the description of more then 30 new species from that locality.
This page provides mineralogical data about Georgechaoite.
Unique Identifiers
Mindat ID:
1675
Long-form identifier:
mindat:1:1:1675:5
GUID
(UUID V4):
(UUID V4):
42d03f04-4ae6-4abd-b372-abf38fe48b6b
IMA Classification of Georgechaoite
Approved
IMA Formula:
KNaZrSi3O9 · 2H2O
Classification of Georgechaoite
9.DM.15
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
59.2.2.4
59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
14.10.18
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
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 |
|---|---|---|
| Gch | 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 Georgechaoite
Colour:
Colorless, white
Hardness:
5 on Mohs scale
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.70(2) g/cm3 (Measured) 2.689 g/cm3 (Calculated)
Optical Data of Georgechaoite
Type:
Biaxial (-)
RI values:
nα = 1.578(1) nβ = 1.597(1) nγ = 1.606(1)
2V:
Measured: 67° , Calculated: 68°
Max Birefringence:
δ = 0.028
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:
Moderate
Dispersion:
very weak
Pleochroism:
Non-pleochroic
Chemistry of Georgechaoite
Mindat Formula:
NaKZr[Si3O9] · 2H2O
Common Impurities:
Fe,Ti
Crystallography of Georgechaoite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 11.38 Å, b = 12.94 Å, c = 6.73 Å
Ratio:
a:b:c = 0.879 : 1 : 0.52
Unit Cell V:
991.04 ų (Calculated from Unit Cell)
Twinning:
interpenetration twins by a halfturn about [023]
Comment:
p21nb
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
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) |
|---|---|---|---|---|---|---|---|
| 0005200 | Georgechaoite | Ghose S, Thakur P (1985) The crystal structure of georgechaoite NaKZrSi3O9.2H2O The Canadian Mineralogist 23 5-10 |  | 1985 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.46 Å | (73) |
| 5.95 Å | (70) |
| 5.83 Å | (32) |
| 5.67 Å | (52) |
| 3.l2 Å | (100) |
| 2.894 Å | (19) |
| 2.829 Å | (22) |
| 2.201 Å | (20) |
| 2.049 Å | (19) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks | |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Georgechaoite
General Appearance of Type Material:
interpenetrent twins
Place of Conservation of Type Material:
National Museum of Natural History, Smithsonian Institution, Washington, D.C. (NMNH #161902)
Geological Setting of Type Material:
miarolitic cavities in Nepheline syenite laccolith
Associated Minerals at Type Locality:
Synonyms of Georgechaoite
Other Language Names for Georgechaoite
Common Associates
Associated Minerals Based on Photo Data:
| 6 photos of Georgechaoite associated with Aegirine | NaFe3+Si2O6 |
| 3 photos of Georgechaoite associated with Catapleiite | Na2Zr(Si3O9) · 2H2O |
| 2 photos of Georgechaoite associated with Smectite Group | A0.3D2-3[T4O10]Z2 · nH2O |
| 2 photos of Georgechaoite associated with Microcline | K(AlSi3O8) |
| 1 photo of Georgechaoite associated with Carbocernaite | (Ca,Na)(Sr,Ce,Ba)(CO3)2 |
| 1 photo of Georgechaoite associated with Feldspar Group | |
| 1 photo of Georgechaoite associated with Eudialyte Group | [N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2) |
| 1 photo of Georgechaoite associated with Fluorite | CaF2 |
Related Minerals - Strunz-mindat Grouping
| 9.DM. | Kesebolite-(Ce) | CeCa2Mn(AsO4)(SiO3)3 |
| 9.DM.05 | Stokesite | CaSn[Si3O9] · 2H2O |
| 9.DM.10 | Calciohilairite | CaZr[SiO3]3 · 3H2O |
| 9.DM.10 | Hilairite | Na2Zr[SiO3]3 · 3H2O |
| 9.DM.10 | Komkovite | BaZr[Si3O9] · 3H2O |
| 9.DM.10 | Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O |
| 9.DM.10 | Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O |
| 9.DM.15 | Gaidonnayite | Na2Zr(Si3O9) · 2H2O |
| 9.DM.15 | Plumbogaidonnayite | PbZrSi3O9 · 2H2O |
| 9.DM.20 | Chkalovite | Na2BeSi2O6 |
| 9.DM.25 | Vlasovite | Na2ZrSi4O11 |
| 9.DM.30 | Revdite | Na16Si16O27(OH)26 · 28H2O |
| 9.DM.35 | Scheuchzerite | Na(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3 |
| 9.DM.40 | Hydroterskite | Na2ZrSi6O12(OH)6 |
| 9.DM.40 | Terskite | Na4ZrSi6O16 · 2H2O |
Fluorescence of Georgechaoite
none observed
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 Georgechaoite
mindat.org URL:
https://www.mindat.org/min-1675.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Georgechaoite
Reference List:
Localities for Georgechaoite
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.
Brazil | |
| RRUFF ID: R100082 +2 other references |
Russia | |
| PEKOV et al. (2013) |
| ... | |
| Pakhomovsky et al. (2014) +1 other reference |
| Ivanyuk et al. (2015) | |
| ... +1 other reference |
USA (TL) | |
| BOGGS et al. (1985) +1 other reference |
Quick NavTopAbout GeorgechaoiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Yukspor Mt, Khibiny Massif, Murmansk Oblast, Russia