星の砂 / ほしのすな [hoshi no suna] or 'Star Sand' in Japanese.
Final Fantasy IV
Buy: 4,800 gil (Sell: 500 gil)
Other: casts Comet on all enemies
Final Fantasy VII

Buy: - (sell: ? gil)
Drop: Behemoth, Serpent
Obtain: buy for 8,000 BP from Battle Square (after Meteor activation)
Effect: casts Cometga with 1,120 base dmg per hit for 4 hits
Final Fantasy XII
Buy: - (sell: 1,505 gil)
Use: Pheasant Netsuke
Drop: Spee, Wyrdhare
Steal: Spee
Poach: Wyrdhare
Description: A fine dust that glitters like starts in the night sky. Some natural philosophers believe the dust to have actually blown down to us from the stars themselves.
Revenant Wings
Buy: 4,320 (sell: 2,160 gil)
Shop: Material Shop, chapter 8 onwards
Use: Caldera, Eruptor, Fumarole, Holy Lance, Stoneblade
Obtain: Destiny in the Stars (harvest 67%), Dalmascan Treasure (harvest 67%), Dalmasca Estersand Monster Melee (harvest 67%)
Description: Sand that sparkles like the night sky. Many scholars insist it is not of this world.
Other: low-grade Glittering Dust
Category: Item