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Scolecite

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Formula:
CaAl2Si3O10 · 3H2O
System:
Monoclinic
Colour:
colorless, white , pink, ...
Hardness:
5 - 5½
Name:
From the Greek, σκώληξ (skolex) = 'worm' in reference to the mineral's reaction to the blowpipe flame.

Classification of Scolecite

Approved, 'Grandfathered' (first described prior to 1959)
9.GA.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
Dana 7th ed.:
77.1.5.5
77.1.5.5

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.9.22

16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca

Occurrences of Scolecite

Physical Properties of Scolecite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Silky when fibrous
Colour:
colorless, white , pink, salmon, red, green
Streak:
white
Hardness (Mohs):
5 - 5½
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on the {110} and {110}
Fracture:
Irregular/Uneven
Density:
2.25 - 2.29 g/cm3 (Measured)    2.275 g/cm3 (Calculated)

Crystallography of Scolecite

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Cell Parameters:
a = 18.508(5) Å, b = 18.981(5) Å, c = 6.527(2) Å
β = 90.64°
Ratio:
a:b:c = 0.975 : 1 : 0.344
Unit Cell Volume:
V 2,292.79 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Crystals are slender prismatic
Twinning:
On {100}, twin axis [001], contact or penetration twins
X-Ray Powder Diffraction:
Image Loading

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

Optical Data of Scolecite

Type:
Biaxial (-)
RI values:
nα = 1.507 - 1.513 nβ = 1.516 - 1.520 nγ = 1.517 - 1.521
2V:
Measured: 36° to 56°, Calculated: 36° to 40°
Max Birefringence:
δ = 0.010
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 Scolecite

Formula:
CaAl2Si3O10 · 3H2O
All elements listed in formula:
Common Impurities:
Na,K

Relationship of Scolecite to other Species

Other Members of Group:
Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
MesoliteNa2Ca2Si9Al6O30 · 8H2O
NatroliteNa2Al2Si3O10 · 2H2O
ParanatroliteNa2Al2Si3O10 · 3H2O
TetranatroliteFormerly in Zeolite Group, Natrolite Subgroup.
9.GA.05Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
9.GA.05MesoliteNa2Ca2Si9Al6O30 · 8H2O
9.GA.05NatroliteNa2Al2Si3O10 · 2H2O
9.GA.05ParanatroliteNa2Al2Si3O10 · 3H2O
9.GA.10Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
9.GA.10Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
9.GA.15EdingtoniteBa[Al2Si3O10] · 4H2O
9.GA.15KalborsiteK6Al4BSi6O20(OH)4Cl
16.9.1GehleniteCa2Al(AlSiO7)
16.9.2AnorthiteCa(Al2Si2O8)
16.9.3Yoshiokaite(Ca,Na)[Al(Al,Si)O4]
16.9.4SvyatoslaviteCa(Al2Si2O8)
16.9.5DmisteinbergiteCa(Al2Si2O8)
16.9.6GrossularCa3Al2(SiO4)3
16.9.7VuagnatiteCaAl(SiO4)(OH)
16.9.8Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
16.9.9Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
16.9.10PrehniteCa2Al2Si3O10(OH)2
16.9.11KamaishiliteCa2(Al2SiO6)(OH)2
16.9.12BicchuliteCa2(Al2SiO6)(OH)2
16.9.13MargariteCaAl2(Al2Si2O10)(OH)2
16.9.14ChantaliteCaAl2(SiO4)(OH)4
16.9.15CebolliteCa5Al2(SiO4)3(OH)4
16.9.17KatoiteCa3Al2(SiO4)3-x(OH)4x
16.9.18LawsoniteCaAl2(Si2O7)(OH)2 · H2O
16.9.19ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
16.9.20WairakiteCa(Al2Si4O12) · 2H2O
16.9.21VertumniteCa4Al4Si4O6(OH)24 · 3H2O
16.9.23LaumontiteCaAl2Si4O12 · 4H2O
16.9.24YugawaraliteCaAl2Si6O16 · 4H2O
16.9.25Gismondine-CaCaAl2Si2O8 · 4H2O
16.9.26EpistilbiteCaAl2Si6O16 · 5H2O
16.9.27GoosecreekiteCa[Al2Si6O16] · 5H2O
16.9.28CowlesiteCaAl2Si3O10 · 6H2O
16.9.30StelleriteCa4(Si28Al8)O72 · 28H2O
16.9.31SträtlingiteCa2Al2SiO7 · 8H2O
16.9.32AmstalliteCaAl(Si,Al)4O8(OH)4 · (H2O,Cl)
77.1.5.1NatroliteNa2Al2Si3O10 · 2H2O

Other Names for Scolecite

Other Information

May be yellow to brown in LW and SW
Electrical:
Pyreoelectric, piezeoelectric.
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 Scolecite

Reference List:
Neues Jahrbuch für Mineralogie, Abhandlungen: 143: 231-248.

Zeitschrift für Kristallographie (1984): 166: 219-223.

Kvick, A., Stahl, K., and Smith J.V. (1985) A neutron diffraction study of the bonding of zeolitic water in scolecite at 20K. Zeitschrift für Kristallographie: 171: 141-154.

Comodi, P., G.D. Gatta, & P.F. Zanazzi (2002), High-pressure behavior of scolecite: European Journal of Mineralogy: 14: 567-574.

Internet Links for Scolecite

mindat.org URL:
http://www.mindat.org/min-3594.html
Please feel free to link to this page.
Specimens:
The following Scolecite specimens are currently listed for sale on minfind.com.

Localities for Scolecite

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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