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Na(Sr,Ca)2[Al5Si5O20] · 7H2O
Named as the Sr-dominant analog of Thomsonite-Ca.
Zeolite Group. Thomsonite Subgroup. The strontium analogue of Thomsonite-Ca.

Classification of Thomsonite-Sr

Approval Year:

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites

Type Occurrence of Thomsonite-Sr

Geological Setting of Type Material:
Hydrothermal veinlets cutting natrolite-bearing core of a pegmatite dike

Physical Properties of Thomsonite-Sr

Diaphaneity (Transparency):
Hardness (Mohs):
[100] Perfect, [010] Good
2.47 g/cm3 (Measured)    2.62 g/cm3 (Calculated)

Crystallography of Thomsonite-Sr

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 13.050Å, b = 13.123Å, c = 13.241Å
a:b:c = 0.994 : 1 : 1.009
Unit Cell Volume:
V 2,267.59 ų (Calculated from Unit Cell)
Non-standard space-group setting Pcnn.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
2.691 (100)
2.86 (100)
2.96 (100)
3.49 (90)
3.19 (80)
4.66 (80)
6.63 (70)

Optical Data of Thomsonite-Sr

Biaxial (+)
RI values:
nα = 1.528 nβ = 1.532 nγ = 1.540
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.
Surface Relief:
weak, r > v

Chemical Properties of Thomsonite-Sr

Na(Sr,Ca)2[Al5Si5O20] · 7H2O
Idealised Formula:
NaSr2[Al5Si5O20] · 7H2O
All elements listed in formula:

Relationship of Thomsonite-Sr to other Species

Other Members of Group:
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
9.GA.05Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
9.GA.05MesoliteNa2Ca2Si9Al6O30 · 8H2O
9.GA.05NatroliteNa2Al2Si3O10 · 2H2O
9.GA.05ParanatroliteNa2Al2Si3O10 · 3H2O
9.GA.05ScoleciteCaAl2Si3O10 · 3H2O
9.GA.10Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
9.GA.15EdingtoniteBa[Al2Si3O10] · 4H2O

Other Names for Thomsonite-Sr

Name in Other Languages:
Simplified Chinese:锶杆沸石
Traditional Chinese:锶桿沸石

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:
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 URL:
Please feel free to link to this page.

Localities for Thomsonite-Sr

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Honshu Island
    • Chubu Region
      • Niigata Prefecture; 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.
  • Kachin State
    • Mohnyin District (Moe Hnyin District)
      • Hpakant Township (Hpakan; Phakant; Phakan)
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)
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
Doklady Earth Sci. 376, 1, 101-104 (2001)
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