- Geode (Wikipedia)
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.
- Iota Carinae (Wikipedia)
Iota Carinae is a star in the southern constellation of Carina. It has the official name Aspidiske, pronounced /ˌæspɪˈdɪskiː/; Iota Carinae is its Bayer designation, which is Latinized from ι Carinae and abbreviated Iota Car or ι Car. With an apparent visual magnitude of 2.2, it is one of the brighter stars in the night sky.