Rocks & Minerals

Halite is salt, just normal salt, that has accumulated ...

Gold is a heavy metal that is rare in ...

Since it is primarily made of lead, galena is ...

Enargite is a mineral that contains both copper and ...

Hematite is the most important iron ore, containing about ...

Fluorite is a crystal that forms in clusters of ...

Melanterite is a secondary mineral, formed by the oxidation ...

Olivenite forms as a layer on top of copper ...

Obsidian is a silica rich volcanic glass. Chemical ...

Needle stone or needle-zeolite are other informal names for ...