
When penniless businessman Mr Bedford retreats to the Kent coast to write a play, he meets by chance the brilliant Dr Cavor, an absent-minded scientist on the brink of developing a material that blocks gravity. Cavor soon succeeds in his experiments, only to tell a stunned Bedford the invention makes possible one of the oldest dreams of humanity: a journey to the moon. With Bedford motivated by money, and Cavor by the desire for knowledge, the two embark on the expedition. But neither are prepared for what they find - a world of freezing nights, boiling days and sinister alien life, on which they may be trapped forever.
That reminds me of a passage from H.G. Wells's «The First Men In The Moon», where the narrator protagonist is so hungry that he can't help but take a bite out of some fungi-like lunar vegetation, and convinces his colleague Cavor to indulge in it as well... but the fungi happens to be psychoactive!
If anyone's interested, it's at the end of Chapter XI, «The Mooncalf Pastures», from the paragraph that begins “We roused ourselves...” onward: https://www.gutenberg.org/files/1013/1013-h/1013-h.htm#chap1...
(A similar example to your red pebble would be "Cavorite" from the H. G. Wells story "The first men in the moon", which also negated gravity causing objects to shoot violently upwards. The explanation given however was buoyancy, which makes more sense I suppose.)
