So I've read an adaptaion of this book in a different language, but the writer there didn't reveal the original book name. He just said, "It's a well-known sci-fi book." Here are some details:
The book begins with a girl crashing a party and killing a couple of her classmates with a shotgun.
Two parallel stories are told at the same time; one is from current earth, the other one is from ancient alien planet.
The said planet was between Mars and Jupiter, and humans- probably the inhabitants of Atlantis desroyed that planet.
The planet had some kind of hive mind- much like Pandora in Avatar- and while all the developed life forms were destroyed by the human attack, some microorganisms survived and the planet's mind survived with them.
Pieces of that destroyed planet crashed on earth carrying those microorganisms.
The crash formed a lake and the water was polluted by microorganisms.
Mainly highschool kids were affected by those organisms.
Those who were affected were attracted to raw meat for it being rich with iron, since the organisms probably survived on iron.
The organisms didn't have a mind of there own (probably)
The main character in that adaptaion was a girl who slowly got infected with the microorganisms ( character may vary in the original one)
She started having flashbacks of the destroyed planet.
In the end, she blows up her house with all the infected people in it, but she herself turns into a monster gradually (presumably an alien) and hides in the nearby forest, losing her human memories completely.
I'd say it was written between 1960 and 2000.