- A geode (/ˈdʒiː.oʊd/; from Ancient Greek γεώδης (geṓdēs) ’earthlike’) is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded. The crystals are formed by the filling of vesicles in volcanic and subvolcanic rocks by minerals deposited from hydrothermal fluids; or by the dissolution of syn-genetic concretions and partial filling by the same or other minerals precipitated from water, groundwater, or hydrothermal fluids.
- Star Tales - Phoenix (ianridpath.com)
A constellation representing the mythical bird that supposedly was reborn from its own ashes. It is the largest of the 12 figures invented at the end of the 16th century from the observations made by the Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman. As with all the Keyser and de Houtman constellations it was first depicted on a globe by Petrus Plancius in 1598 and first appeared in print in 1603 on the Uranometria atlas of Johann Bayer. The constellation lies near the southern end of the river Eridanus and its brightest star, Alpha Phoenicis, known as Ankaa, is of magnitude 2.4.