Garnet is a group of related stones, the most popular of which is a deep red. Until the chemical composition was known, red semiprecious gemstones were called carbuncles.
Garnets have a particular chemical formula of two metals, usually calcium, magnesium or iron and aluminium, iron or chromium bound to silicon oxide - the general forumula is X3Y2(SiO4)3.
A hornet is a common name given to some types of large wasp. Hornets have stingers and eat other insects.
Jis forJet (aircraft)
A jet is the common name given to any airplane that is powered by jet engines rather than propellers. Most modern aircraft are powered by jet engines, so people tend to refer to smaller, faster military aircraft as jets.
Jis forJet (stone)
Jet, also called lignite, is not a true mineral or stone. It is fossilised decaying wood. The original structure of the wood can be seen in jet under a microscope.
Jet is black and has been used to make jewellery for many years. It was quite popular to make mourning jewellery, for wearing at funerals.
A magnet is material that produces a magnetic field. Because of this field, magnets can both attract and repel each other (depending on which end of the magnet you use) and can attract ferromagnetic materials, such as iron. The small pieces of iron filing on the magnet in the picture follow the shape of the magnet's magnetic field.
Magnets are most often seen stuck to refrigerators.