On Offer: An exceptional 0.88 gram Henbury glass impactite specimen with a pearl-like glossy surface on most of the specimen. Henbury glass of this quality is rare and highly sought after by collectors. This specimen has an unusually glassy smooth shinny black surface much like its more expensive and rare cousins the pearls. These types of specimens are thought to contain more of the iron impactor than the more common rough scoriaceous specimens. They rarely seem to come on the market, and the few that do usually get snapped up quickly.