Det här kan vara Hans Bemmann s "Stenen och flöjten" (ursprungligen publicerad på tyska 1983 men översatt på engelska 1988).
Eftersom jag hade en liknande erfarenhet av att läsa den för länge sedan (blir lite uttråkad och lämnar den halvvägs), minns jag inte mycket om detaljer, men jag är säker på att det fanns en faun / satyr som vände sig till sten.
Sammanfattning från Google Böcker :
In the country of Fraglund lives a young boy called Listener, a boy destined to inherit a precious stone and a magic flute which will help him to understand life's deepest mysteries. This is his story. As a young man, Listener is blind to the true value of his gifts. Before he can fully appreciate them he must endure many years of adventure and misadventure in his travels beyond Fraglund - with Gisa, evil mistress of Barlebogue castle; as servant to the minstrel Barlo and later as a minstrel himself; with the beautiful and ambitious Narzia, whose magic will commit him to the life of a faun; and with Arnilukka, in whose eyes he finds the colours of his mysterious stone. As he grows older, Listener slowly realizes that his life is caught up in a web of connections far deeper than he had at first presumed.