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Thomsonite-Ca

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Thomas Thomson
Formula:
NaCa2(Al5Si5)O20 · 6H2O
System:
Orthorhombic
Colour:
Colourless, white, light ...
Lustre:
Vitreous, Pearly
Hardness:
5 - 5½
Member of:
Name:
Renamed in 1820 by Henry James Brooke in honor of Thomas Thomson [April 12, 1773 Crieff, Perthshire, Scotland - July 2, 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 suffix -Ca denotes the dominance of calcium in the mineral.
Zeolite Group.
The calcium analogue of Thomsonite-Sr.

Some habits may be confused with stellerite.


Classification of Thomsonite-Ca

Approved, 'Grandfathered' (first described prior to 1959)
9.GA.10

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
16.10.4

16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis

Physical Properties of Thomsonite-Ca

Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless, white, light yellow, light green, pink, brown
Streak:
White
Hardness (Mohs):
5 - 5½
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {010}
Good on {100}
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
2.23 - 2.29 g/cm3 (Measured)    2.366 g/cm3 (Calculated)

Optical Data of Thomsonite-Ca

Type:
Biaxial (+)
RI values:
nα = 1.511 - 1.530 nβ = 1.513 - 1.532 nγ = 1.516 - 1.545
2V:
Measured: 44° to 75°, Calculated: 44° to 80°
Max Birefringence:
δ = 0.005 - 0.015
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v strong

Chemical Properties of Thomsonite-Ca

IMA Formula:
NaCa2(Al5Si5)O20 · 6H2O
Elements listed in formula:
Common Impurities:
K

Crystallography of Thomsonite-Ca

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 13.088(2) Å, b = 13.052(2) Å, c = 13.229(2) Å
Ratio:
a:b:c = 1.003 : 1 : 1.014
Unit Cell Volume:
V 2,259.84 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals commonly prismatic, acicular, bladed, massive
Twinning:
On {110}. This twinning can be cyclic for repetition of 4 crystals.
Reference: Rudy Tschernich on Micro Probe (1996 vol. VIII, n. 4) SEM photo n.489 and one twinned crystal drawing. The sample is from Yellow Lake, Olalla, British Columbia, Canada
Comment:
Space group Pncn. Note: Thomsonite-Ca with disordered Al/Si-distribution has a = 13.0809(3), b = 13.0597(3), c = 6.6051(1) Å, V = 1128.37(14) Å3 and space group Pbnm (Gatta et al., 2010).
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Occurrences of Thomsonite-Ca

Type Occurrence of Thomsonite-Ca

Geological Setting of Type Material:
Amygdaloids in basalt.

Relationship of Thomsonite-Ca to other Species

Member of:
Other Members of Group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2O
AmiciteK2Na2Al4Si4O16 · 5H2O
Ammonioleucite(NH4,K)(AlSi2O6)
AnalcimeNa(AlSi2O6) · H2O
Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O
BikitaiteLiAlSi2O6 · H2O
BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2O
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Levyne SubgroupA subgroup of the Zeolite Group.
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
ClinoptiloliteNote on the distinguishing differences between clinoptilolite and heulandite (hhttp://rruff.
CowlesiteCaAl2Si3O10 · 6H2O
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Dachiardite-KK4(Si20Al4O48)·13H2O
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2O
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2O
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2O
ErioniteThis name now refers to a group of related minerals.
Faujasite SubgroupA subgroup of the Zeolite Group.
FerrieriteZeolite Group.
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2O
Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
GaultiteNa4Zn2Si7O18 · 5H2O
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
GmeliniteIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2O
GoosecreekiteCa[Al2Si6O16] · 5H2O
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2O
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
HeulanditeNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
HsianghualiteCa3Li2(Be3Si3O12)F2
KirchhoffiteCs(BSi2O6)
LaumontiteCaAl2Si4O12 · 4H2O
LovdariteK2Na6Be4Si14O36 · 9H2O
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2O
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
Mazzite-NaNa8[Al4Si14O36]2 · 30H2O
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
Montesommaite(K,Na)9Al9Si23O64 · 10H2O
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
MutinaiteNa3Ca4Si85Al11O192 · 60H2O
NabesiteNa2BeSi4O10 · 4H2O
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2O
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2O
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
PhillipsiteZeolite Group.
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
StelleriteCa4(Si28Al8)O72 · 28H2O
Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2O
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2O
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2O
WairakiteCa(Al2Si4O12) · 2H2O
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2O
Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2O
WillhendersoniteKCa[Al3Si3O12] · 5H2O
YugawaraliteCaAl2Si6O16 · 4H2O
9.GA.05Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
9.GA.05MesoliteNa2Ca2(Si9Al6)O30 · 8H2O
9.GA.05NatroliteNa2(Si3Al2)O10 · 2H2O
9.GA.05ParanatroliteNa2(Si3Al2)O10 · 3H2O
9.GA.05ScoleciteCa(Si3Al2)O10 · 3H2O
9.GA.10Thomsonite-SrNaSr2Al5Si5O20 · 6-7H2O
9.GA.15EdingtoniteBa(Si3Al2)O10 · 4H2O
9.GA.15KalborsiteK6Al4BSi6O20(OH)4Cl
16.10.1Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
16.10.2LisetiteNa2CaAl4(SiO4)4
16.10.5Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
16.10.6MesoliteNa2Ca2(Si9Al6)O30 · 8H2O
16.10.7Faujasite
16.10.8Garronite-CaNaCa2.5(Si10Al6)O32 · 14H2O
16.10.9BoggsiteNa3Ca8(Si77Al19)O192 · 70H2O
16.10.10Herschelite(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
16.10.11Phillipsite
16.10.12Fedorite(K,Na)2.5(Ca,Na)7Si16O38(OH,F)2 · 3.5H2O
16.10.13WillhendersoniteKCa(Si3Al3)O12 · 5H2O
16.10.14BarreriteNa2(Al2Si7)O18 · 6H2O
16.10.15Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
16.10.16ReyeriteNa2Ca14Al2Si22O58(OH)8 · 6H2O
16.10.17Lévyne
16.10.18Clinoptilolite
16.10.19Heulandite
16.10.20GobbinsiteNa5(Si11Al5)O32 · 11H2O
16.10.21Stilbite
16.10.22Dachiardite
16.10.23OffretiteKCaMg(Si13Al5)O36 · 15H2O
16.10.24PerlialiteK9NaCa(Si24Al12)O72 · 15H2O
16.10.25Erionite
16.10.26Paulingite
16.10.27Sodium Dachiardite(Na2,Ca,K2)4-5Al8Si40O96 · 26H2O
16.10.28Mazzite-MgMg5(Si26Al10)O72 · 30H2O
16.10.29RoggianiteCa2BeAl2Si4O13(OH)2 · nH2O (n < 2.5)

Other Names for Thomsonite-Ca

Other Information

Electrical:
Pyroelectric
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-Ca

Reference List:
Wise, W. S. & Tschernich, R. W. (1978): Habit, crystal forms and composition of thomsonite. Can. Mineral. 16, 487-493.

American Mineralogist (1992): 77: 685.

Acta Crystallographica: C46: 1370-1373.

Lee, Y., J.A. Hriljac, A. Studer & T. Vogt (2004), Anisotropic compression of edingtonite and thomsonite to 6 GPa at room temperature: Physics and Chemistry of Minerals: 31: 22-27.

Kol’tsova, T. N. (2005): Zeolites of the natrolite-thomsonite series. Inorganic Materials, 41, 750-756.

Gatta, G. D., Kahlenberg, V., Kaindl, R., Rotiroti, N., Cappelletti, P. and de’ Gennaro, M. (2010): Crystal structure and low-temperature behavior of “disordered” thomsonite. American Mineralogist 95, 495-502.

Internet Links for Thomsonite-Ca

mindat.org URL:
https://www.mindat.org/min-3941.html
Please feel free to link to this page.
Specimens:
The following Thomsonite-Ca specimens are currently listed for sale on minfind.com.

Localities for Thomsonite-Ca

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.
Mineral and/or Locality  
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