Does The Stress of Her Regard have sparkly-skinned vampires? The other information I'd easily believe, and I know both vampires are made of stony materials, but do the ones in The Stress of Her Regard, sparkle?
Preferably with a quote to confirm...
From TVTropes: OlderThanTheyThink/Literature:
** Vampires whose bodies are largely composed of sparkly minerals? Check. Abusive vampire/human love affairs with nonstop bed-breaking sex? Check. Improvised Caesarean section on a human who's impregnated with an unprecedented vampire offspring? Check ... if it's The Stress of Her Regard (1989) by Tim Powers, and not Twilight.