 LIMONITE |
|
 MERCURY | |
 OPAL |
 OBSIDIAN |
TEKTITE |
 AMBER |
The members of this unofficial class are often mistaken for minerals and are sometimes classified as minerals, but lack the necessary crystalline structure to be truly classified as such. Pearl, jet and amber are in addition the products of organic process that further remove them from full mineral status. These materials are found naturally, some are treated as gemstones and are included in most mineral references (which is why we decided to include them here!).
- Amber (Succinite - fossilized tree resin)
Jet (Very Compact Coal)- lechatelierite (Nearly Pure Silica Glass)
- Limonite (A Mixture of Oxides)
- Mercury (A Liquid at Normal Temperatures)
- Obsidian (Volcanic Silica Glass)
- Opal (Hydrated Silica)
Pearl (Organicly Produced Carbonate)- Tektites (Meteoritic Silica Glass)
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