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Georgechaoite

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About GeorgechaoiteHide

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 (b. 1930), 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.


Classification of GeorgechaoiteHide

Approved
9.DM.15

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
14.10.18

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

Physical Properties of GeorgechaoiteHide

Colour:
colorless, white
Hardness:
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.70(2) g/cm3 (Measured)    2.689 g/cm3 (Calculated)

Optical Data of GeorgechaoiteHide

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.
Surface Relief:
Moderate
Dispersion:
very weak
Pleochroism:
Non-pleochroic

Chemical Properties of GeorgechaoiteHide

Formula:
NaKZr[Si3O9] · 2H2O
IMA Formula:
KNaZrSi3O9 · 2H2O
Common Impurities:
Fe,Ti

Crystallography of GeorgechaoiteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.46 (73)
5.95 (70)
5.83 (32)
5.67 (52)
3.l2 (100)
2.894 (19)
2.829 (22)
2.201 (20)
2.049 (19)

Type Occurrence of GeorgechaoiteHide

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 GeorgechaoiteHide

Other Language Names for GeorgechaoiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Catapleiite2 photos of Georgechaoite associated with Catapleiite on mindat.org.
Aegirine2 photos of Georgechaoite associated with Aegirine on mindat.org.
Carbocernaite1 photo of Georgechaoite associated with Carbocernaite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DM.05StokesiteCaSn[Si3O9] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.DM.10CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
9.DM.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
9.DM.10KomkoviteBaZr[Si3O9] · 3H2OTrig.
9.DM.10Sazykinaite-(Y)Na5YZr[SiO3]6 · 6H2O
9.DM.10Pyatenkoite-(Y)Na5YTi[SiO3]6 · 6H2OTrig.
9.DM.15GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
9.DM.20ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
9.DM.25VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
9.DM.30RevditeNa16Si16O27(OH)26 · 28H2OMon. 2 : B2
9.DM.35ScheuchzeriteNa(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3Tric. 1 : P1
9.DM.40TerskiteNa4ZrSi6O16 · 2H2OOrth.

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

59.2.2.1CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
59.2.2.2CalciocatapleiiteCaZr(Si3O9) · 2H2O
59.2.2.3GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
59.2.2.5LoudouniteNaCa5Zr4Si16O40(OH)11 · 8H2O

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.10.1ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.2HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.3ZektzeriteLiNaZrSi6O15Orth.
14.10.4ParakeldyshiteNa2ZrSi2O7Tric.
14.10.5VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
14.10.6Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
14.10.7GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
14.10.8TerskiteNa4ZrSi6O16 · 2H2OOrth.
14.10.9ElpiditeNa2ZrSi6O15 · 3H2OOrth.
14.10.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
14.10.11PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
14.10.12KhibinskiteK2ZrSi2O7Mon.
14.10.13WadeiteK2Zr(Si3O9)Hex.
14.10.14DalyiteK2ZrSi6O15Tric.
14.10.15KostyleviteK2Zr(Si3O9) · H2OMon.
14.10.16UmbiteK2(Zr,Ti)Si3O9 · H2OOrth.
14.10.17ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth.
14.10.19GittinsiteCaZrSi2O7Mon.
14.10.20CalciocatapleiiteCaZr(Si3O9) · 2H2O
14.10.21CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
14.10.22ArmstrongiteCaZr[Si6O15] · 3H2OMon.
14.10.23Lemoynite(Na,K)2CaZr2Si10O26 · 5H2OMon. 2/m : B2/b
14.10.24CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
14.10.25BaghdaditeCa3(Zr,Ti)(Si2O7)O2Mon.
14.10.26LovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
14.10.27Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2Mon. 2/m : P21/b
14.10.28PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
14.10.29DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
14.10.30BaziriteBaZr(Si3O9)Hex.
14.10.31KomkoviteBaZr[Si3O9] · 3H2OTrig.
14.10.32ZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)Trig.
14.10.33Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12Hex.

Fluorescence of GeorgechaoiteHide

none observed

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 GeorgechaoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Boggs, R.L. & Ghose, S. (1985): Georgechaoite NaKZrSi3O9.2H2O, a new mineral species from Wind Mountain, New Mexico. Canadian Mineralogist 23, 1-4.
Ghose, S. & Thakur, P. (1985): The crystal structure of georgechaoite. Canadian Mineralogist 23, 5-10.

Internet Links for GeorgechaoiteHide

Localities for GeorgechaoiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Brazil
 
  • Minas Gerais
Robinson, G. W., King, V. T., Scovil, J., & Cureton, F. (1995). World review of mineral discoveries: 1993-1994. Mineralogical Record, 26(5), 475.; RRUFF ID: R100082
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
PEKOV, I.V. & NIKOLAEV, A.P. (2013) Minerals of the pegmatites and hydrothermal assemblages of the Koashva deposit (Khibiny, Kola Peninsula, Russia). Mineralogical Almanac 189(2), 7-65.
www.koeln.netsurf.de/~w.steffens/lovo.htm
Ivanyuk, G. Y., Pakhomovsky, Y. A., & Yakovenchuk, V. N. (2015). Eudialyte-group minerals in rocks of Lovozero layered complex at Mt. Karnasurt and Mt. Kedykvyrpakhk. Geology of Ore Deposits, 57(7), 600-613.; Pakhomovsky, Y. A., Ivanyuk, G. Y., & Yakovenchuk, V. N. (2014). Loparite-(Ce) in rocks of the Lovozero layered complex at Mt. Karnasurt and Mt. Kedykvyrpakhk. Geology of Ore Deposits, 56(8), 685-698.
Ivanyuk, G. Y., Pakhomovsky, Y. A., & Yakovenchuk, V. N. (2015). Eudialyte-group minerals in rocks of Lovozero layered complex at Mt. Karnasurt and Mt. Kedykvyrpakhk. Geology of Ore Deposits, 57(7), 600-613.
      • Northern Karelia
www.koeln.netsurf.de/~w.steffens/vuori.htm; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
USA (TL)
 
  • New Mexico
    • Otero Co.
      • Cornudas Mts
BOGGS, R.L. & GHOSE, S. (1985): Georgechaoite NaKZrSi3O92H2O, a new mineral species from Wind Mountain, New Mexico. Canadian Mineralogist 23, 1 4. GHOSE, S. & THAKUR, P. (1985): The crystal structure of georgechaoite. Canadian Mineralogist 23, 5-10.
Mineral and/or Locality  
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