ALMOST THERE!. Help us with a final push needed to keep mindat.org running. Click here to help.
Catawiki are hosting a mindat.org benefit auction. All proceeds to mindat.org! BID NOW
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Thornasite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About ThornasiteHide

Formula:
(Na,K)12Th3[Si8O19]4 · 18H2O
Colour:
Light green to beige
Lustre:
Greasy, Pearly
Crystal System:
Trigonal
Name:
The name reflects its composition: thorium (Thor), sodium (Na) and silicon (Si).
This page provides mineralogical data about Thornasite.


Classification of ThornasiteHide

Approved
Approval Year:
1985
9.GF.50

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
F : Other Rare Zeolites
72.1.2.1

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
1 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
14.11.4

14 : Silicates not Containing Aluminum
11 : Silicates of Th and Hg

Physical Properties of ThornasiteHide

Greasy, Pearly
Transparency:
Transparent, Translucent, Opaque
Colour:
Light green to beige

Optical Data of ThornasiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.510 nε = 1.512
Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of ThornasiteHide

Formula:
(Na,K)12Th3[Si8O19]4 · 18H2O
IMA Formula:
Na12Th3(Si8O19)4 · 18H2O
Common Impurities:
U,Al,Ca,Cl

Crystallography of ThornasiteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 29.08 Å, c = 17.30 Å
Ratio:
a:c = 1 : 0.595
Unit Cell V:
12,669.68 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
14.54 (20)
8.17 (30)
7.27 (100)
5.09 (20)
4.17 (70)
3.239 (30)
2.890 (25)

Type Occurrence of ThornasiteHide

Synonyms of ThornasiteHide

Other Language Names for ThornasiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Villiaumite2 photos of Thornasite associated with Villiaumite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.GF.05Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2OOrth.
9.GF.10GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2OOrth.
9.GF.15LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
9.GF.20GaultiteNa4Zn2Si7O18 · 5H2OOrth. mm2 : Fdd2
9.GF.25ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
9.GF.30Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
9.GF.35MutinaiteNa3Ca4Si85Al11O192 · 60H2OOrth.
9.GF.40TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2OIso. m3m (4/m 3 2/m) : Fm3m
9.GF.55DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2OOrth. mmm (2/m 2/m 2/m) : Pmmn

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.11.1ThoriteTh(SiO4)Tet.
14.11.2HuttoniteThSiO4Mon.
14.11.3UmbozeriteNa3Sr4Th[Si(O,OH)3-4]8Amor.
14.11.5Yttrialite-(Y)(Y,Th)2Si2O7
14.11.6Edgarbaileyite(Hg-Hg)3Si2O7Mon.

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 ThornasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
ANSELL, V.E., and CHAO, G.Y. (1987) Thornasite, a new hydrous sodium thorium silicate from Mont St Hilaire, Quebec. Canadian Mineralogist, 25, 181 183.
LI, Y., KRIVOVICHEV, V., and BURNS, P.C. (2000) The crystal structure of thornasite, Na12Th3[Si8O19]4(H2O)18: A novel interrupted Silicate framework. American Mineralogist, 85, 1521-1525;
LI, Y., KRIVOVICHEV, V., and BURNS, P.C. (2001) Errata. American Mineralogist, 86, 384.
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.

Internet Links for ThornasiteHide

Localities for ThornasiteHide

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.
Canada (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
ANSELL, V.E., and CHAO, G.Y. (1987) Thornasite, a new hydrous sodium thorium silicate from Mont St Hilaire, Quebec. Canadian Mineralogist, 25, 181-183. LI, Y., KRIVOVICHEV, V., and BURNS, P.C. (2000) The crystal structure of thornasite, Na12Th3[Si8O19]4(H2O)18: A novel interrupted Silicate framework. American Mineralogist, 85, 1521-1525; LI, Y., KRIVOVICHEV, V., and BURNS, P.C. (2001) Errata. American Mineralogist, 86, 384. HORVÁTH, L., and GAULT, R.G. (1990) The mineralogy of Mont Saint Hilaire. Mineralogical Record, 21, 284 359.
      • Lajemmerais RCM
        • Varennes & St-Amable
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.
Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
Namibia
 
  • Khomas Region
    • Windhoek District
      • Aris
Paula Piilonen, unpublished results; Horváth specimen collected in 2011 confirmed by XRD; Blass, G. & Tremmel, G. (2014): Neptunit und weitere neue Mineralien aus den Phonolith-Steinbrüchen von Aris, Windhoek. Mineralien-Welt 25 (1), 76-83 (in German); Kolitsch, U., Blaß, G., Jahn, S., Cámara, F., von Bezing, L., Wartha, R. R., Tremmel, G., Sturla, M., Cerea, P., Skebo, M. and Ciriotti, M. E. (2016): Aris - mineralogy of the famous alkaline phonolite. AMI - Associazione Micromineralogica Italiana, Cremona, Italy, 95 pp.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: December 14, 2018 17:05:23 Page generated: December 10, 2018 12:47:00
Go to top of page