The phrase "invaluable materials" is correct and usable in written English.
This phrase is used to describe objects or resources that have a great amount of importance or worth, usually in a figurative sense. For example, you could say "The professor's lectures provided us with invaluable materials for our research project."
She also called upon the Parents Teacher's Association to collaborate with school authorities to make appropriate and good use of the invaluable materials.
Such studies have provided invaluable materials for the development of immunochemical and immunohistochemical discriminatory tests that have the ability to differentiate between BSE and scrapie [ 12- 17].
In a similar context, we can regard FFPE tissues as a source for invaluable materials for proteomics analysis for the molecular characterization of disease processes aimed at improving diagnosis, prognosis, and therapy [ 2].
He also began publication of the Anthologie des maîtres religieux primitifs, which provided choral societies with invaluable material.
They're not only invaluable material for aspiring writers – because exactly how many drafts does it take to reach a decent story?
This is invaluable material for the specialist, though Andante's overpackaging (for small coffee tables?) and price ($54) seem aimed at others.
During the ship's four-year journey the crew discovered over 4,000 unknown species and provided invaluable material for the raging debate about evolution.Business travellers in today's emerging markets often feel a bit like the Challenger's crew.
The workshops in Peckham have provided invaluable material: two girls from a previous consultation of this kind, who are still active in gangs, helped to shape two of the film's central characters including Danielle.
Golestan Cohort Study may provide invaluable material to investigate risk factors of CKD prospectively and to optimal risk prediction of future ERSD in the region.
JAW collected invaluable material from across the state of Georgia and edited the manuscript.
Muscle biopsies remain an invaluable material for the further analysis of the molecular composition of lipofuscin inclusions and their fate in ERT-treated patients.
