To be classified as a "true" mineral, a substance must be a Solid and have a Crystal structure. It must also be an inorganic, naturally-occurring, homogeneous substance with a defined chemical composition.
- Allingite , another name for amber.
- Amber , organic, non-crystal structure.
- Anthracite , a variety of coal, "hard coal."
- Beckerite , another name for amber.
- Burmite , another name for amber.
- Coal , organic, nonhomogeneous, and non-crystal structure.
- Coprolite , fossilized feces, a Fossil of organic origin.
- Coquina , nonhomogeneous, non-crystal structure.
- Gedanite , another name for amber.
- Glessite , another name for amber.
- Jet , not considered a true mineral due to organic, non-crystal nature, a mineraloid.
- Krantzite , another name for amber.
- Lignite , a variety of coal, "Brown coal."
- Obsidian , usually not considered a mineral due to non-crystal structure.
- Opal , non-crystal structure, a mineraloid.
- Pearl , often considered a mineral due to crystal components, but then not a mineral due to organic origin, probably should be a mineraloid.
- Petroleum , organic and liquid.
- Rocks , most rocks are mixtures of minerals, but a few are composed of just one mineral.
- , organic, nonhomogeous, non-crystal structure.
- Stantienite , another name for amber.
- Synthetic Diamond , not naturally occurring like most other synthetic gems, but difficult to distinguish from naturally occurring forms.
- , Vulcanize d natural or synthetic rubber, thus not a mineral due to organic composition, lack of crystal structure, and not naturally occurring.
- Water , a liquid (but naturally occurring Ice is a mineral).
Some minerals, such as the well-known Apatite and Mica , are not homogeneous substances, but are a mixture of related minerals, sometimes referred to as a mineral group.
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