J.T.s’ Rock Collection

Today I learned from my library book what marble and quartzite are made of. Marble is made mainly of the mineral calcite. Marble is metamorphosed limestone, and the original layering may still show. It will fizz with acid and can be scratched with a sharp object. Often white, but can be black, red, green, or just patchy. Fossils may occur but are rare. Quartzite is made mostly of grains of quartz but feldspar mica or other minerals may be present. Quartzites are metamorphosed quartz sandstone. Usually coarssely layered they have an even texture and the quartz grains are closely interlocked. Often white but maybe yellowish, grey, or reddish in color. I have had so much fun collecting rocks that I wanted to know more about them, and I am having just as much fun learning about the different types as I do finding them.