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Thomsonite-Sr

Big Photo

Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2008, J. Weissman

Formula:
(Sr,Ca)
 
2
Na[Al
 
5
Si
 
5
O
 
20
]·7H
 
2
O
System:OrthorhombicColour:Colorless
Hardness:5
Name:Named as the Strontium dominant analog of Thomsonite-Ca.


Zeolite Group. Natrolite Subgroup. The strontium analogue of Thomsonite-Ca.

Classification of Thomsonite-Sr

IMA status:Approved 2000
Strunz 8th edition ID:8/J.21-
Nickel-Strunz 10th (pending) edition ID:9.GA.10

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
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Type Occurrence of Thomsonite-Sr

Type Locality:Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Geological Setting of type material:Hydrothermal veinlets cutting natrolite-bearing core of a pegmatite dike

Physical Properties of Thomsonite-Sr

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colorless
Hardness (Mohs):5
Cleavage:Perfect
[100] Perfect, [010] Good
Density (measured):2.47 g/cm3
Density (calculated):2.62 g/cm3

Crystallography of Thomsonite-Sr

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:a = 13.05Å, b = 13.123Å, c = 13.241Å
Ratio:a:b:c = 0.994 : 1 : 1.009
Unit Cell Volume:V 2 ų
Z:4
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction:
d-spacingIntensity
2.691 (100)
2.86 (100)
2.96 (100)
3.49 (90)
3.19 (80)
4.66 (80)

Optical Data of Thomsonite-Sr

Type:Biaxial (+)
RI values: nα = 1.528 nβ = 1.532 nγ = 1.540
2V:Measured: 62° , Calculated: 72°
Maximum Birefringence:δ = 0.012

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:weak, r > v

Chemical Properties of Thomsonite-Sr

Formula:
(Sr,Ca)
 
2
Na[Al
 
5
Si
 
5
O
 
20
]·7H
 
2
O
Essential elements:
All elements listed in formula:Al, Ca, H, Na, O, Si, Sr

Relationship of Thomsonite-Sr to other Species

Related Minerals - Nickel-Strunz Grouping):
9.GA.05Gonnardite
Na
 
2
Ca[Al
 
2
Si
 
3
O
 
10
]
 
2
 · 7H
 
2
O
9.GA.05Mesolite
Na
 
2
Ca
 
2
[Al
 
2
Si
 
3
O
 
10
]
 
3
 · 8H
 
2
O
9.GA.05Natrolite
Na
 
2
[Al
 
2
Si
 
3
O
 
10
] · 2H
 
2
O
9.GA.05Paranatrolite
Na
 
2
Al
 
2
Si
 
3
O
 
10
·3H
 
2
O
9.GA.05Scolecite
Ca[Al
 
2
Si
 
3
O
 
10
] · 3H
 
2
O
9.GA.10Thomsonite-Ca
NaCa
 
2
[Al
 
5
Si
 
5
O
 
20
] · 6H
 
2
O
9.GA.15Edingtonite
Ba[Al
 
2
Si
 
3
O
 
10
] · 4H
 
2
O
9.GA.15Kalborsite
K
 
6
[Cl|B(OH)
 
4
|Al
 
4
Si
 
6
O
 
20
]

Other Names for Thomsonite-Sr

Synonyms:
IMA2000-025
German names:
Thomsonit-Sr
Russian names:
Томсонит-Sr

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
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    Localities for Thomsonite-Sr

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    The 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.
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    (TL) indicates type locality. ? 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.
    Japan
     
    • Honshu Island
      • Chubu Region
        • Niigata Prefecture
    		www-jm.eps.s.u-tokyo.ac.jp/2002cd-rom/pdf/j038/j038-003_e.pdf.
    Miyajima, et al. (1999) Kobutsu-Gakkai Koen-Yoshi (Abstract of the Meeting of the Mineralogical Society of Japan), 93.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		Doklady Earth Sci. 376, 1, 101-104 (2001)
    Mineral and/or Locality
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