This is a palm-sized, polished Nebula Stone, 3.3 oz and 3.2” by 1.45" by 0.6", from an old collection that I took in on a trade years ago. It is black as the night sky in deepest space with swirling galaxies of green … nebulas light years away from Earth. Nebula Stone resembles Kambaba jasper, but unlike Kambaba, contains a complex of quartz, anorthoclase, amite, arfedsonite, rebeckite and zircon. These are found in an undisclosed location in Central America and are a rarity, particularly in this size. And it's my only one. 

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Green Galaxies in the Night – Palm Sized Nebula Stone