Scolecite

Big Photo

India
0.54 carats
© Rarestone.com

Scolecite is named after Greek "skolex" - worm, because the borax bead containing the mineral in some cases curls up like a worm in the blowpipe flame.

Scolecite forms pyroelectric and piezoelectric colourless to white slender crystals.

Scolecite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Scolecite Gemstones by Size

This table shows distribution of Scolecite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.54 cts
Heaviest:4.8 cts
Average:2.18 cts
Total photos:3
Do you have a larger Scolecite? Why not upload a photo?
0.54ct to 0.97ct0.97ct to 1.39ct1.39ct to 1.82ct1.82ct to 2.24ct2.24ct to 2.67ct2.67ct to 3.10ct3.10ct to 3.52ct3.52ct to 3.95ct3.95ct to 4.37ct4.37ct to 4.80ct
General Information
Chemical Formula
CaAl
 
2
Si
 
3
O
 
10
· 3H
 
2
O
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Scolecite
Mohs Hardness5 to 5.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity2.20 to 2.23
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityPerfect
Michael O’Donoghue, Gems, Sixth Edition (2006)
FractureUneven
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Scolecite
Refractive Index1.512 to 1.523
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterBiaxial/-
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.011
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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DispersionStrong
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)Colourless, white
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent,Translucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
LustreVitreous,Silky
Anthony et al, Handbook of mineralogy (2001) Silky when fibrous
Fluorescence & other light emissions
Fluorescence (General)There may be a yellow to brown fluorescence
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Crystallography of Scolecite
Crystal SystemMonoclinic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitPseudotetragonal
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Scolecite occurs with other zeolites primarily as a cavity mineral in basalts.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Further Information
Mineral information:Scolecite information at mindat.org
Significant Gem Localities
Iceland
 
  • Eastern Region
    • Suður-Múlasýsla
      • Berufjördur
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 447
India
 
  • Maharashtra
    • Pune District (Poonah District)
      • Junnar
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 447
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