Townendite
A valid IMA mineral species
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About Townendite
Formula:
Na8ZrSi6O18
Colour:
Colorless
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.95 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
Named for Roger Townend (b. 1938), a consulting mineralogist based in Perth, western Australia, for his contributions to mineralogy, particularly related to the Ilímaussaq deposit, southern Greenland.
This page provides mineralogical data about Townendite.
Unique Identifiers
Mindat ID:
39764
Long-form identifier:
mindat:1:1:39764:7
GUID
(UUID V4):
(UUID V4):
c08dde0d-484d-4cb0-a8c6-d447544beccf
IMA Classification of Townendite
Approved
IMA Formula:
Na8ZrSi6O18
Approval year:
2009
First published:
2010
Classification of Townendite
9.CJ.15a
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
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 |
---|---|---|
Twn | 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 Townendite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Townendite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
5 - 6 on Mohs scale
Cleavage:
None Observed
Parting:
none
Fracture:
Conchoidal
Density:
2.95 g/cm3 (Calculated)
Optical Data of Townendite
Type:
Uniaxial (-)
RI values:
nω = 1.563(3) nε = 1.555(3)
Max Birefringence:
δ = 0.008
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:
Low
Chemistry of Townendite
Mindat Formula:
Na8ZrSi6O18
Elements listed:
Crystallography of Townendite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 10.345(2) Å, c = 13.103(2) Å
Ratio:
a:c = 1 : 1.267
Unit Cell V:
1,214.40 ų (Calculated from Unit Cell)
Z:
3
Crystal Structure
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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) |
---|---|---|---|---|---|---|---|
0005045 | Townendite | Grey I E, Macrae C M, Mumme W G, Pring A (2010) Townendite, Na8ZrSi6O18, a new uranium-bearing lovozerite group mineral from the Ilimaussaq alkaline complex, Southern Greenland American Mineralogist 95 646-650 | 2010 | the Ilimaussaq alkaline complex, Southern Greenland | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
5.286 Å | (33) |
5.175 Å | (28) |
4.240 Å | (14) |
3.698 Å | (100) |
3.280 Å | (42) |
2.645 Å | (42) |
2.585 Å | (45) |
1.849 Å | (35) |
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 |
Type Occurrence of Townendite
General Appearance of Type Material:
Small anhedral to subhedral grains with sizes of typically 10 to 50 µm, up to a maximum dimension of 100 µm.
Place of Conservation of Type Material:
Museum Victoria (GPO Box 666E, Melbourne, Victoria 3001, Australia), specimen number M51188.
Geological Setting of Type Material:
Lujavrite layer of the layered igneous intrusion. Possibly formed as an alteration product of steenstrupine-(Ce).
Associated Minerals at Type Locality:
Reference:
Grey, I.E., Macrae, C.M., Mumme, W.G. and Pring, A. (2010): Townendite, Na8ZrSi6O18, a new uranium-bearing lovozerite group mineral from the Ilímaussaq alkaline complex, Southern Greenland. American Mineralogist, 95, 646-650.
Synonyms of Townendite
Other Language Names for Townendite
Spanish:Townendita
Relationship of Townendite to other Species
Member of:
Other Members of this group:
Combeite | Na4.5Ca3.5Si6O17.5(OH)0.5 | Trig. 3m (3 2/m) : R3m |
Kapustinite | Na6ZrSi6O16(OH)2 | Mon. 2/m : B2/m |
Kazakovite | Na6Mn2+Ti(Si6O18) | Trig. 3m (3 2/m) : R3m |
Litvinskite | Na2(◻,Na,Mn)ZrSi6O12(OH,O)6 | Mon. m : Bm |
Lovozerite | Na2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O | Trig. 3 : R3 |
Tisinalite | Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O | Trig. 3m (3 2/m) |
Zirsinalite | Na6(Ca,Mn2+,Fe2+)Zr(Si6O18) | Trig. 3m (3 2/m) : R3m |
Related Minerals - Strunz-mindat Grouping
9.CJ. | Avdeevite | NaAl4(Be5Li)(Si6O18)2(H2O)1-2 |
9.CJ. | Nakkaalaaqite | K2[Na3Ca]LiCa2Ti2Be4Si12O38 |
9.CJ. | Zolotarevite | Na5Zr[Si6O15(OH)3] · 3H2O |
9.CJ. | Beryllocordierite-Na | NaMg4(Al5Be)(AlSi5O18)2 · 2H2O |
9.CJ. | Beryllosachanbińskiite-Na | NaMn4(Al5Be)(AlSi5O18)2 · 2H2O |
9.CJ.05 | Bazzite | Be3Sc2(Si6O18) |
9.CJ.05 | Beryl | Be3Al2(Si6O18) |
9.CJ.05 | Indialite | Mg2Al3(AlSi5O18) |
9.CJ.05 va | Vorobyevite | Be3Al2(Si6O18) |
9.CJ.05 | Stoppaniite | Be3Fe3+2(Si6O18) · H2O |
9.CJ.05 | Ferroindialite | (Fe2+,Mg)2Al4Si5O18 |
9.CJ.05 | Johnkoivulaite | Cs[Be2B]Mg2Si6O18 |
9.CJ.10 | Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
9.CJ.10 | Sekaninaite | (Fe,Mg)2Al3(AlSi5O18) |
9.CJ.15a | Combeite | Na4.5Ca3.5Si6O17.5(OH)0.5 |
9.CJ.15b | Imandrite | Na12Ca3Fe3+2(Si6O18)2 |
9.CJ.15a | Kazakovite | Na6Mn2+Ti(Si6O18) |
9.CJ.15c | Koashvite | Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O |
9.CJ.15a | Lovozerite | Na2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O |
9.CJ.15a | Tisinalite | Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O |
9.CJ.15a | Zirsinalite | Na6(Ca,Mn2+,Fe2+)Zr(Si6O18) |
9.CJ.15a | Litvinskite | Na2(◻,Na,Mn)ZrSi6O12(OH,O)6 |
9.CJ.15a | Kapustinite | Na6ZrSi6O16(OH)2 |
9.CJ.25 | Baratovite | KCa7(Ti,Zr)2Li3Si12O36F2 |
9.CJ.25 | Katayamalite | KLi3Ca7Ti2(SiO3)12(OH)2 |
9.CJ.25 | Aleksandrovite | KCa7Sn2Li3Si12O36F2 |
9.CJ.30 | Dioptase | CuSiO3 · H2O |
9.CJ.35 | Kostylevite | K2Zr(Si3O9) · H2O |
9.CJ.40 | Petarasite | Na5Zr2(Si6O18)(Cl,OH) · 2H2O |
9.CJ.45 | Gerenite-(Y) | (Ca,Na)2(Y,REE)3Si6O18 · 2H2O |
9.CJ.50 | Odintsovite | K2Na4Ca3Ti2Be4Si12O38 |
9.CJ.55 | Mathewrogersite | Pb7FeAl3GeSi12O36(OH,H2O)6 |
9.CJ.60 | Pezzottaite | Cs(Be2Li)Al2(Si6O18) |
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 Townendite
mindat.org URL:
https://www.mindat.org/min-39764.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Townendite
Reference List:
Localities for Townendite
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).
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.
All localities listed without proper references should be considered as questionable.
Greenland (TL) | |
| |
Russia | |
|
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Karnasurt mine, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia