The asteroid Juno is one of the largest stony asteroids orbitting our sun. Juno was first spotted in 1804 by German astronomer Karl Harding. An unusally bright stony asteroid, Juno is thought to be the source of some iron bearing meteorites found on Earth.
Glass Eye Studios in Seattle, Washington handblows their astronomy paperweights using dichroic glass and ash from the 1980 eruption of Mt. St. Helens.
Dichroic glass is an optical metallic oxide glass developed by NASA to protect sensitive equipment from cosmic radiation and to protect astronauts from harmful unflitered sunlight while in space. Extremely thin layers of metal are vacuum deposited on glass and the layers permit some light and color wavelengths to pass thorugh while deflecting others. This produces a chameleon effect in which the color of the glass changes with the amount of light being absorbed or reflected.