For more specific information on cleavage and photographs, see the Physical Geology web page on Minerals. Some minerals, such as quartz and olivine do not have cleavage. They have instead a special type of breakage called conchoidal fracture . Conchoidal fracture produces curved breakage surfaces, such as would be seen on arrowheads or chipped glass. The only magnetic mineral we may see in lab is magnetite.
Calcite fizzes readily in hydrochloric acid.
Dolomite will fizz if it is first scratched and powdered. You may use a nail or steel needle probe to scratch the specimen to try this test. If you are taking the course online, you will need to borrow a small amount of HCL acid from the lab, or you may try to obtain it locally. It is sold in some hardware stores as muriatic acid. It may also be available from some pharmacies.