The Avestan word asman-
Word asman-
Meaning stone, sky
See also Greek: ἄκμων ‘anvil’
Proto-Indo-European: *h₄ék̂mōn ‘stone’
Sanskrit: áśman- ‘stone, rock’

Other words that might be of interest
drvaēna- ‘wooden’, hvarə ‘sun’, gairi- ‘mountain’, būmi- ‘earth’, huuar- ‘sun’, māh- ‘moon’, snaēžā ‘snow’, zam- ‘earth, ground’, star- ‘star’, razura- ‘forest, grove’