Thomsonite-Sr
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About Thomsonite-Sr
Formula:
Na(Sr,Ca)2[Al5Si5O20] · 7H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.47
Crystal System:
Orthorhombic
Member of:
Name:
Named as the Sr-dominant analog of Thomsonite-Ca.
The root name thomsonite is in honor of Thomas Thomson (12 April 1773 Crieff, Perthshire, Scotland - 2 July 1852 Kilmun, Argyleshire, Scotland), professor of chemistry at the University of Glasgow. Thomson was an indefatigable mineral chemist and contributed enormously to the number of accurate chemical analyses of minerals during his career as well as having discovered many new mineral species.
The root name thomsonite is in honor of Thomas Thomson (12 April 1773 Crieff, Perthshire, Scotland - 2 July 1852 Kilmun, Argyleshire, Scotland), professor of chemistry at the University of Glasgow. Thomson was an indefatigable mineral chemist and contributed enormously to the number of accurate chemical analyses of minerals during his career as well as having discovered many new mineral species.
Classification of Thomsonite-Sr
Approved
Approval Year:
2000
8/J.21-
9.GA.10
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
Physical Properties of Thomsonite-Sr
Vitreous
Transparency:
Transparent
Colour:
Colorless
Hardness:
5 on Mohs scale
Cleavage:
Perfect
[100] Perfect, [010] Good
[100] Perfect, [010] Good
Density:
2.47 g/cm3 (Measured) 2.62 g/cm3 (Calculated)
Optical Data of Thomsonite-Sr
Type:
Biaxial (+)
RI values:
nα = 1.528 nβ = 1.532 nγ = 1.540
2V:
Measured: 62° , Calculated: 72°
Max Birefringence:
δ = 0.012

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
Dispersion:
weak, r > v
Chemical Properties of Thomsonite-Sr
Formula:
Na(Sr,Ca)2[Al5Si5O20] · 7H2O
IMA Formula:
NaSr2Al5Si5O20 · 6-7H2O
Idealised Formula:
NaSr2[Al5Si5O20] · 7H2O
Crystallography of Thomsonite-Sr
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 13.050 Å, b = 13.123 Å, c = 13.241 Å
Ratio:
a:b:c = 0.994 : 1 : 1.009
Unit Cell V:
2,267.59 ų (Calculated from Unit Cell)
Z:
4
Comment:
Non-standard space-group setting Pcnn.
X-Ray Powder Diffraction
Image Loading
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.691 | (100) |
2.86 | (100) |
2.96 | (100) |
3.49 | (90) |
3.19 | (80) |
4.66 | (80) |
6.63 | (70) |
Type Occurrence of Thomsonite-Sr
Geological Setting of Type Material:
Hydrothermal veinlets cutting natrolite-bearing core of a pegmatite dike
Synonyms of Thomsonite-Sr
Other Language Names for Thomsonite-Sr
German:Thomsonit-Sr
Russian:Томсонит-Sr
Simplified Chinese:锶杆沸石
Spanish:Thomsonita-Sr
Traditional Chinese:锶桿沸石
Relationship of Thomsonite-Sr to other Species
Member of:
Other Members of this group:
Alflarsenite | NaCa2Be3Si4O13(OH) · 2H2O | Mon. 2 : P21 |
Amicite | K2Na2Al4Si4O16 · 5H2O | Mon. 2 |
Ammonioleucite | (NH4,K)(AlSi2O6) | Tet. |
Analcime | Na(AlSi2O6) · H2O | Tric. |
Barrerite | (Na,K,Ca0.5)2[Al2Si7O18] · 7H2O | Orth. mmm (2/m 2/m 2/m) |
Bellbergite | (K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O | Hex. |
Bikitaite | LiAlSi2O6 · H2O | Tric. 1 : P1 |
Boggsite | Ca8Na3(Si,Al)96O192 · 70H2O | Orth. mmm (2/m 2/m 2/m) : Imma |
Brewsterite-Ba | (Ba,Sr)[Al2Si6O16] · 5H2O | Mon. 2/m : P21/m |
Brewsterite-Sr | (Sr,Ba,Ca)[Al2Si6O16] · 5H2O | |
Chabazite-Levyne Subgroup | A subgroup of the Zeolite Group. | |
Chiavennite | CaMnBe2Si5O13(OH)2 · 2H2O | Mon. 2/m : P21/b |
Clinoptilolite | Note on the distinguishing differences between clinoptilolite and heulandite (hhttp://rruff. | |
Cowlesite | CaAl2Si3O10 · 6H2O | Orth. |
Dachiardite-Ca | (Ca,Na2,K2)5Al10Si38O96 · 25H2O | Mon. |
Dachiardite-K | K4(Si20Al4O48)·13H2O | Mon. |
Dachiardite-Na | (Na2,Ca,K2)5Al10Si38O96 · 25H2O | Mon. |
Direnzoite | NaK6MgCa2(Al13Si47O120) · 36H2O | Orth. mmm (2/m 2/m 2/m) : Pmmn |
Edingtonite | Ba[Al2Si3O10] · 4H2O | |
Epistilbite | CaAl2Si6O16 · 5H2O | Mon. |
Erionite | This name now refers to a group of related minerals. | |
Faujasite | A subgroup of the Zeolite Group. | |
Ferrierite | Zeolite Group. | |
Ferrochiavennite | Ca1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O | Mon. 2/m : P21/b |
Flörkeite | (K3Ca2Na)[Al8Si8O32] · 12H2O | Tric. 1 : P1 |
Garronite-Ca | Na2Ca5Al12Si20O64 · 27H2O | Tet. 4 2m : I4m2 |
Gaultite | Na4Zn2Si7O18 · 5H2O | Orth. mm2 : Fdd2 |
Gismondine-Ba | Ba2Al4Si4O16 · 4-6H2O | |
Gismondine-Ca | CaAl2Si2O8 · 4H2O | |
Gmelinite | In 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K. | |
Gobbinsite | Na5(Si11Al5)O32 · 11H2O | Orth. |
Goosecreekite | Ca[Al2Si6O16] · 5H2O | Mon. |
Gottardiite | Na3Mg3Ca5Al19Si117O272 · 93H2O | Orth. |
Harmotome | (Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O | Mon. 2/m : P21/m |
Heulandite | Note on the distinguishing differences between heulandite and clinoptilolite (http://rruff. | |
Hsianghualite | Ca3Li2(Be3Si3O12)F2 | |
Kirchhoffite | Cs(BSi2O6) | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Laumontite | CaAl2Si4O12 · 4H2O | Mon. 2/m : B2/m |
Lovdarite | K2Na6Be4Si14O36 · 9H2O | Orth. mm2 |
Maricopaite | Pb7Ca2(Si,Al)48O100 · 32H2O | Orth. |
Mazzite-Mg | (Mg,K,Ca)5(Si26Al10)O72 · 28H2O | Hex. |
Mazzite-Na | Na8[Al4Si14O36]2 · 30H2O | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
Merlinoite | (K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O | Orth. |
Montesommaite | (K,Na)9Al9Si23O64 · 10H2O | Orth. |
Mordenite | (Na2,Ca,K2)Al2Si10O24 · 7H2O | Orth. |
Mutinaite | Na3Ca4Si85Al11O192 · 60H2O | Orth. |
Nabesite | Na2BeSi4O10 · 4H2O | Orth. 2 2 2 : P21 21 21 |
Natrolite Subgroup | A subgroup of the Zeolite Group. | |
Offretite | KCaMg(Si13Al5)O36 · 15H2O | Hex. 6 m2 : P6m2 |
Pahasapaite | Li8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O | Iso. 2 3 : I2 3 |
Parthéite | Ca2(Si4Al4) O15 (OH)2•4H2O | Mon. 2/m : B2/b |
Paulingite-Ca | (Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2O | Iso. |
Paulingite-K | (K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O | Iso. |
Paulingite-Na | (Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O | Iso. |
Perlialite | K9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O | Hex. |
Phillipsite | Zeolite Group. | |
Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O | Iso. m3m (4/m 3 2/m) : Ia3d |
Roggianite | Ca2Be(OH)2Al2Si4O13 · 2.5H2O | Tet. |
Stellerite | Ca4(Si28Al8)O72 · 28H2O | Orth. mmm (2/m 2/m 2/m) : Fmmm |
Stilbite-Ca | NaCa4[Al9Si27O72] · nH2O | Mon. 2/m : B2/m |
Stilbite-Na | (Na,Ca,K)6-7[Al8Si28O72] · nH2O | Mon. 2/m : B2/m |
Terranovaite | (Na,Ca)8(Si68Al12)O160 · 29H2O | Orth. |
Thomsonite-Ca | NaCa2[Al5Si5O20] · 6H2O | Orth. mmm (2/m 2/m 2/m) |
Tschernichite | (Ca,Na2)[Al2Si4O12] · 4-8H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm |
Tschörtnerite | Ca4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2O | Iso. m3m (4/m 3 2/m) : Fm3m |
Wairakite | Ca(Al2Si4O12) · 2H2O | Mon. 2/m |
Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O | Mon. |
Wenkite | (Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2O | Hex. |
Willhendersonite | KCa[Al3Si3O12] · 5H2O | Tric. |
Yugawaralite | CaAl2Si6O16 · 4H2O | Mon. |
Related Minerals - Nickel-Strunz Grouping
9.GA.05 | Gonnardite | (Na,Ca)2(Si,Al)5O10 · 3H2O | Orth. |
9.GA.05 | Mesolite | Na2Ca2Si9Al6O30 · 8H2O | Orth. mm2 : Fdd2 |
9.GA.05 | Natrolite | Na2Al2Si3O10 · 2H2O | Orth. mm2 : Fdd2 |
9.GA.05 | Paranatrolite | Na2Al2Si3O10 · 3H2O | Mon. m : Bb |
9.GA.05 | Scolecite | CaAl2Si3O10 · 3H2O | Mon. m : Bb |
9.GA.10 | Thomsonite-Ca | NaCa2[Al5Si5O20] · 6H2O | Orth. mmm (2/m 2/m 2/m) |
9.GA.15 | Edingtonite | Ba[Al2Si3O10] · 4H2O | |
9.GA.15 | Kalborsite | K6Al4BSi6O20(OH)4Cl | Tet. |
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.
References for Thomsonite-Sr
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., et al. (2001) Zapiski Vse. Mineral. Obshch., 130 (4), 46-55.
American Mineralogist: 87: 1511.
Lee, Y., J.A. Hriljac, A. Studer & T. Vogt (2004b), Anisotropic compression of edingtonite and thomsonite to 6 GPa at room temperature: Physics and Chemistry of Minerals: 31: 22-27.
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 130(4): 46-55.
Doklady, Earth Science Sections (2001): 376(1): 101-104.
Internet Links for Thomsonite-Sr
mindat.org URL:
https://www.mindat.org/min-28899.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Thomsonite-Sr
Locality List




All localities listed without proper references should be considered as questionable.
Japan | |
| www-jm.eps.s.u-tokyo.ac.jp/2002cd-rom/pdf/j038/j038-003_e.pdf.; Shi, G., Harlow, G. E., Wang, J., Wang, J., Ng, E., Wang, X., ... & Cui, W. (2012). Mineralogy of jadeitite and related rocks from Myanmar: a review with new data. European Journal of Mineralogy, 24(2), 345-370. |
Miyajima, et al. (1999) Kobutsu-Gakkai Koen-Yoshi (Abstract of the Meeting of the Mineralogical Society of Japan), 93. | |
Myanmar | |
| Shi, G., Harlow, G.E., Wang, J. Wang, J., Ng, E., Wang, X., Cao, G. & Cui, W. (2012): Mineralogy of jadeitite and related rocks from Myanmar:a review with new data. Eur. J. Mineral. 24, 345–370 |
Russia (TL) | |
| Doklady Earth Sci. 376, 1, 101-104 (2001) |
Rasvumchorr Mt, Khibiny Massif, Murmanskaya Oblast', Northern Region, Russia