Graphology - the study of handwritings; autograph - written with one's own hand; seismograph - a machine noting strength and duration of earthquakes. marina - a harbor for pleasure boats; maritime - relating to the sea; submarine - an undersea boat; aquamarine - color of sea water.
Chemicals are classified into various hazard classifications in accordance with their physiochemical properties and health hazards. Each class of chemical has a pictorial symbol called a danger symbol.
Scientific Classifications of Mineral Groups. Scientific Classification. **Minerals and gemstones are classified according to their chemical compositions. There are eight classes, along with a ninth class for non-minerals, which may be non-crystalline organic combinations and/or rocks.The nine classes are listed below with examples of a few of the individual species within these groups. group of minerals that are compounds of one or more metallic elements associated with the Phosphate radical. They are classified together with the Arsenates and Vanadates. They are usually brittle and occur in small crystals or compact aggregates.