phillipsite

phillipsite

[fil-ip-sahyt]
noun
a zeolite mineral, similar to stilbite but with potassium replacing some of the calcium.

Origin:
1815–25; named after J. W. Phillips (1775–1828), English mineralogist; see -ite1

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phillipsite

hydrated calcium, sodium, and potassium aluminosilicate mineral in the zeolite family [(K,Na,Ca)1-2(Si,Al)8O166H2O]. It typically is found as brittle white crystals filling cavities and fissures in basalt and in phonolite lava, occurring near Rome; on Sicily; in Victoria, Australia; and in Germany. Phillipsite's molecular structure is a framework containing rings of four or eight linked silicate or aluminate tetrahedra (each consisting of four oxygen atoms arranged at the points of a triangular pyramid about a central silicon or aluminum atom); the openness of this structure and the presence of the aluminum atoms (each of which contributes a negatively charged site) give phillipsite cation-exchange properties (dissolved sodium, potassium, calcium, and magnesium readily replacing one another in the structure), making phillipsite useful in water softeners. For detailed physical properties, see zeolite (table). Compare harmotome.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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