While the number of cells in plants and animals varies from species to species, humans contain more than 10 trillion (10 13) cells. Most plant and animal cells are visible only under a microscope, with dimensions between 1 and 100 micrometres.
Owner of Jones Mineral Cabinet, Geology and Paleontology Supervisor, interested in Earth and Planetary sciences. Anthracite is a metamorphic rock commonly called coal ,whose protolith or parent rock is bituminous coal.ituminous coal is a sedimentary rock. Anthracite coal is considered a metamorphic rock. 5 people found this useful. Edit. Share to: 1  The Periodic Table of Elements Life is sustained by a number of chemical elements.
Especially in the case of higher grade metamorphism, crystals can grow in the rock that are considerably larger than the average grain size in the rock (garnets, staurolite). These large crystals are called porphyroblasts (from Greek blastos, to grow) in analogy to porphyric crystals in igneous rocks. The NAMING OF METAMORPHIC ROCKS: Is done by combining the most abundant minerals and the textural type into a name. E.g. Garnet Hornfels, Quartz-mica Schist.