Scolecite information

Scolecite
Scolecite
General
Category	Silicate mineral
Formula; (repeating unit)	CaAl2Si3O10·3H2O
IMA symbol	Slc
Strunz classification	9.GA.05 (10 ed) ; 8/J.21-60 (8 ed)
Dana classification	77.1.5.5
Crystal system	Monoclinic
Crystal class	Domatic (m) ; (same H-M symbol)
Space group	Cc
Identification
Formula mass	392.34 g/mol
Color	Colorless white, pink, salmon, red or green
Crystal habit	Thin prismatic needles, radiating groups and fibrous masses
Twinning	Common on {100}, twin axis [001], rare on {001} and {110}
Cleavage	Perfect on {110} and {110}
Fracture	Irregular/uneven
Tenacity	Brittle
Mohs scale hardness	5 to 5+1⁄2
Luster	Vitreous, silky when fibrous
Streak	White
Diaphaneity	Transparent to translucent
Specific gravity	2.16 to 2.40
Optical properties	Biaxial (−)
Refractive index	Nx = 1.507 to 1.513; Ny = 1.516 to 1.520; Nz = 1.517 to 1.521
Pleochroism	X: colourless Y: colourless Z: colourless
Solubility	Soluble in common acids.
Other characteristics	Pyroelectric and piezoelectric, sometimes fluorescent yellow to brown in LW and SW UV. Not radioactive.
References

Scolecite is a tectosilicate mineral belonging to the zeolite group; it is a hydrated calcium silicate, CaAl₂Si₃O₁₀·3H₂O. Only minor amounts of sodium and traces of potassium substitute for calcium. There is an absence of barium, strontium, iron and magnesium.^[2]^[6] Scolecite is isostructural (having the same structure) with the sodium-calcium zeolite mesolite and the sodium zeolite natrolite, but it does not form a continuous chemical series with either of them.^[2] It was described in 1813, and named from the Greek word, σκώληξ (sko-lecks) = "worm" because of its reaction to the blowpipe flame.

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ ^a ^b ^c ^d Dana: Gaines et al (1997) Dana's New Mineralogy Eighth Edition. Wiley
^ ^a ^b "Scolecite Mineral Data".
^ "Scolecite".
^ Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Scolecite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved 28 December 2021.
^ Zeolites of the World (1992)

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[Dana-2] Dana: Gaines et al (1997) Dana's New Mineralogy Eighth Edition. Wiley

[Webmin-3] "Scolecite Mineral Data".

[Mindat-4] "Scolecite".

[HOM-5] Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Scolecite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved 28 December 2021.

[ZW-6] Zeolites of the World (1992)

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