What is porphyryr and what kind of rock is i?

Question

Or is it a mineral?

Answer 1

A kind of Feldspar.

Answer 2

porphyria is vampirism

Answer 3

A porphyritic texture refers to igneous and metamorphic rocks that have a fine to medium grainsize overall with one or more minerals forming much larger crystals.

"Porphyry" is also a common name for intrusive andesitic rocks, which form porphyry copper deposits.

Answer 4

It is usually a type of fine grained igneous (volcanic, plutonic?)rock with other larger crystals in it.

You will find it easy if you just search porphyry.