Chert is a sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert breaks with a conchoidal fracture.
Pure gold is soft and is usually alloyed with other metals, such as silver, copper. Gold alloys are used to make jewelry, decorative items, dental fillings and coins.
Sandstone is a sedimentary rock composed of sand-size grains of mineral, rock, or organic material. It has also been used for artistic purposes to create statues.
A sedimentary rock with a variable hardness, consisted of rounded or angular rock or mineral fragments cemented by silica, lime, iron oxide. Used in the construction industry.
It is the most common non-siliciclastic sedimentary rock. Limestones are rocks that are composed of mostly calcium carbonate. Fossils are very common in marine calcitic rocks.
It can be used as a bath or body salt. You can mix a table spoon of rock salt in your bath water to have a relaxing bath. Bathing in rock salt water combats water retention,
Slate is a fine-grained, foliated metamorphic rock. It is popular for a wide variety of uses such as roofing, flooring, and flagging because of its durability and attractive appearance.
Schist as a construction material. Schist is not a rock with numerous industrial uses. Its abundant mica grains and its schistosity make it a rock of low physical strength,