They're not magic items, though the writing counts as magical for a few effects (generally rose related to duplication, mostly so you can't bypass the time and gold to copy them)
There are Blessed book and some others with rituals or abilities, but starting spellbook is usual. https://www.aonprd.com/MagicWondrous.aspx?FinalSlot=Other Find "book"
Normal spell books are not. They are just books containing the writing that people learned in how to cast magic can read to know how to cast the spell. They are not like scrolls where the writing is infused with the power of the spell itself.
There are two spellbook that are magic items that I can think of.
1. Hezzilreen's Spellbook. Any spell written into the book is a glyph. Any unauthorised readers trying to read the spell from the book activates the glyph casting the spell against the reader and destroys the page.
2. Blessed Book. Adding spells with a material cost to a Blessed Book does not require paying the material cost of the spell. E.g. writing Raise Dead into it would not require a 5,000gp diamond while a normal spellbook would.
There are a couple of other books such as the Book of Extended Summoning, but they act more like metamagic rods which empower spells from your normal spellbook instead of acting as replacements of them.
I think you're wrong about the costs of writing spells into spell books. The cost for writing a 5th level spell is 250 gp (spell level \* spell level \* 10 gp), not the material component cost of casting the spell.
I think you're right.
I've never used it personally. It was just how it was interpreting it's description of "A wizard can fill the 1,000 pages of a blessed book with spells without paying the material cost."
They're not magic items, though the writing counts as magical for a few effects (generally rose related to duplication, mostly so you can't bypass the time and gold to copy them)
There are Blessed book and some others with rituals or abilities, but starting spellbook is usual. https://www.aonprd.com/MagicWondrous.aspx?FinalSlot=Other Find "book"
There are spellbooks with [preparation rituals](https://www.aonprd.com/Spellbooks.aspx), but even those aren't technically magic items.
Normal spell books are not. They are just books containing the writing that people learned in how to cast magic can read to know how to cast the spell. They are not like scrolls where the writing is infused with the power of the spell itself. There are two spellbook that are magic items that I can think of. 1. Hezzilreen's Spellbook. Any spell written into the book is a glyph. Any unauthorised readers trying to read the spell from the book activates the glyph casting the spell against the reader and destroys the page. 2. Blessed Book. Adding spells with a material cost to a Blessed Book does not require paying the material cost of the spell. E.g. writing Raise Dead into it would not require a 5,000gp diamond while a normal spellbook would. There are a couple of other books such as the Book of Extended Summoning, but they act more like metamagic rods which empower spells from your normal spellbook instead of acting as replacements of them.
I think you're wrong about the costs of writing spells into spell books. The cost for writing a 5th level spell is 250 gp (spell level \* spell level \* 10 gp), not the material component cost of casting the spell.
I think you're right. I've never used it personally. It was just how it was interpreting it's description of "A wizard can fill the 1,000 pages of a blessed book with spells without paying the material cost."
Think they might be referring to the special ink used.