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Scawtite

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Scawtite
General
CategorySilicate mineral
Formula
(repeating unit)
Ca7(Si3O9)2CO3·2H2O
IMA symbolScw
Strunz classification9.CK.15
Dana classification64.2.1.1
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Unit cella = 10.12 Å, b = 15.18 Å
c = 6.62 Å; β = 100.55°; Z = 2
Identification
ColorColorless
Crystal habitPlaty - micaceous, parallel to radiating clusters
CleavagePerfect on {001}, poor on {010}
Mohs scale hardness4–5
LusterVitreous
DiaphaneityTransparent
Specific gravity2.77
Optical propertiesBiaxial (+)
Refractive indexnα = 1.597 - 1.603 nβ = 1.606 - 1.609 nγ = 1.618 - 1.621
Birefringenceδ = 0.021
2V angleMeasured from 74° to 78°
References

Scawtite is a hydrous calcium silicate mineral with carbonate, formula: Ca7(Si3O9)2CO3·2H2O. It crystallizes in the monoclinic crystal system as thin plates or flat prisms.

Scawtite was first described in 1929 for an occurrence at Scawt Hill in Northern Ireland.

Scawtite occurs as in skarns and hydrothermal veins in limestone. Associated minerals include melilite, spurrite, tobermorite, thomsonite, larnite, grossular, bultfonteinite, calcite, analcime, foshagite and hillebrandite.

References

  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.
  2. ^ Scawtite in the Handbook of Mineralogy
  3. ^ Scawtite on Mindat.org
  4. Scawtite data on Webmineral
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