So the values given in the figure and tables below are good representative values, but NOT timeless truth.
Note, the values in the figure and the first table don't agree with each other exactly.
Table: Earth Crust Elemental Composition by Mass Fraction Ordered by Abundance:
It is in the form of chemical compounds of which there are a vast number mostly in form of crystals.
Most of this matter is also classifiable as rock and most of the rock is silicate (a kind of silicon compound) containing oxygen. That this so is very plausible based on the table above where oxygen and silicon are shown as the most abundant elements and they certainly are NOT in pure form in the Earth's crust. Silicate is often virtually a synonym for rock.
Note some rock is NOT in form of crystals, but in the form of amorphous solids.
Table: Earth Crust Chemical Compound Composition by Mass Fraction Ordered by Abundance: