In chemistry|lang=en terms the difference between isomeric and pinite

is that isomeric is (chemistry) exhibiting isomerism while pinite is (chemistry) a sweet white crystalline substance extracted from the gum of a species of pine (, sugar pine), isomeric with quercite.

As an adjective isomeric

is (chemistry|physics) being an isomer.

As a noun pinite is

any fossil wood which exhibits traces of having belonged to the pine family or pinite can be (mineralogy) a compact granular cryptocrystalline mineral of a dull grayish or greenish white color it is a hydrous alkaline silicate, and is derived from the alteration of other minerals, such as iolite.