Properties of Sedimentary, Igneous, and Metamorphic rocks

The sedimentary rocks are limestone, coglomerate, chert/flint, shale, sandstone or arkose,geodes, and bituminous coal. Limestone is fine-grained. It fizzes in acid. Its color is either gray, tan, or cream. Coglomerate is coarse-grained. It is composed of gravel and pebbles. The gravel and pebbles are rounded. Chert/flint is made up of very fine crystals. Chert is cream or tan. Flint is black or gray. It has very smooth texture and cannot be scratched. Shale is fine-grained. It comes in many colors. So shale is layered and soft to touch. Similar-sized sand grains make up sandstone. Sandstone rock can be seen in various colors. It is in between fine-grained and coarse-grained. Geodes are round in shape. When geodes are broken open, they become beautiful crystals. Also, geodes form in limestone. Bituminous coal is black in color. It is fine-grained natural resource. In addition, coal has a low density.

There are six different kinds of igneous rock. Granite, diorite, andesite, rhyolite, basalt, and gabbro are all igneous rocks. Granite, diorite, and gabbro are coarse-grained. The abundance and natural beauty of granite makes it the best-known igneous rock. Headstones for graves are made of granite. Diorite is black and white. Also, it feels rough and bumpy. Gabbro is darker than granite and diorite. It has a green tint to the rock. Andesite, rhylolite, and basalt are fine-grained. Andesite is composed of light and dark individual crystals. Rhylolite is pink or gray. In addition, it is not as common and abundant as granite. Basalt is glassy black.


The types of metamorphic rocks are slate, schist,gneiss, marble and quartzite. Slate, schist, and gneiss are layered rocks. Slate is red, gray or black. Fine-grained clay is called slate rock. Schist is coarse-grained. Also, schist is a thin slab. Gneiss is light and dark crystals. In addition, gneiss is coarse-grained. Marble and quartzite are light-colored and non-layered rocks. Marble reacts with acid and does not scratch glass. Quartzite scratches glass.