SNOW WHITE IRIDESCENT NATROLITE SPHERE ZEOLITE RUSSIA

Pricing & History
  • Sold for
    Start Free Trial or Sign In to see what it's worth.
  • Sold Date
  • Source eBay
SNOW WHITE IRIDESCENT NATROLITE SP ZEOLITE RUSSIA Nice polished SP of the SNOW WHITE VERY IRIDESCENT NATROLITE from Kola Peninsula, Northern Russia, Hibina DIAMETER 38 mm (1.5") WEIGHT 64 gram Comes without support Natrolite is a tectosilicate mineral species belonging to the zeolite group. It is a hydrated sodium and aluminium silicate with the formula Na 2Al 2Si 3O 10 · 2H 2O. It was named natrolite by Martin Heinrich Klaproth in 1803. Needle stone or needle-zeolite are other names, alluding to the common acicular habit of the crystals, which are often very slender and are aggregated in divergent tufts. Larger crystals have the form of a square prism terminated by a low pyramid, the prism angle being nearly a right angle. The crystals are tetragonal in appearance, though actually orthorhombic. T are perfect cleavages parallel to the faces of the prism. The mineral also often occurs in compact fibrous aggregates, the fibers having a divergent or radial arrangement. Natrolite is readily distinguished From other fibrous zeolites by its optical characteristics. Between crossed nicols the fibers extinguish parallel to their length, and they do not show an optic figure in convergent polarized light. Natrolite is usually white or colorless, but sometimes reddish or yellowish. The luster is vitreous, or, in finely fibrous specimens, read more