What does "wollastonite" mean?

Wollastonite: A silicate of lime of a white to gray, red, or yellow color, occurring generally in cleavable masses, rarely in tabular crystals; tabular spar. WOLLASTON'S DOUBLET Wol"las*ton's dou"blet. [After W. H. Wollaston, English physicist.] (Optics) A magnifying glass consisting of two plano-convex lenses. It is designed to correct spherical aberration and chromatic dispersion.