Quartzite is a non-foliated metamorphic rock that is produced by the metamorphism of sandstone. It is composed primarily of quartz. The specimen above is about two inches (five centimeters) across.
Industrial Hemp Facts. Industrial hemp is a variety of Cannabis sativa and is of the same plant species as marijuana. However, hemp is genetically different and distinguished by its use and chemical makeup. Industrial hemp refers to cannabis varieties that are primarily grown as an agricultural crop.
One of the newest uses of hemp is in construction materials. Hemp can be used in the manufacture of press board or composite board. This involves gluing fibrous hemp stalks together under pressure to produce a board which is many times more elastic and durable than hardwood.