Orbicular Jasper (old,California) Ken Roberts Coll.

Item Description

Fantastic jasper, in colorful, multi-hued banded orbs and matrix cover all sides of this surreal, large nodule. The reds, oranges, yellows and greens in the orbs and matrix are absolutely striking. And the cross-cutting vein adds even more pizzazz. One slabbed side is polished and the other is unpolished. Orbicular jasper is RARE from any of the numerous California localities, that MINDAT lists, except from this obscure locality in Santa Clara County. Orbicular Jasper is a name given to a highly silicified rhyolite or tuff that has quartz and feldspar crystallized into radial aggregates of needle-like crystals forming orbicular (spherical) structures (MINDAT). About 15 5-mm slabs of diminishing size could be cut from this fine old rarity. Probably collected in the 1950s. From the Ken Roberts Collection. 2293 grams or 5.1 pounds mass. Valued by Ken at $500.