They are different minerals with the same chemical formula. This phenomenon is isostasy. Nuclei with the same number of protons but different numbers of neutrons are called elements. Quartz and feldspar are examples of sulfide minerals. If an igneous rock has large crystals, it is probably plutonic.
Igneous rocks found in the Rocky Mountains are usually Mafic.
Rocks solidified from volcanic lava flows can be expected to be fine-grained. If an igneous rock has microscopic crystals, it is probably plutonic. Planting cover crops in off-season, strip cropping, and contour plowing are strategies for increasing farm yield. A sediment with particles that are between 2mm and 256mm in size is called a clay. A fossiliferous limestone probably originated in a dune field.