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- Varieties that are not valid species:
- Lapis lazuli (a rock consisting primarily of lazurite, calcite and pyrite)
- Larimar (blue variety of pectolite)
- Lechatelierite (fused quartz glass)
- Lignite (a type of coal)
- Limonite -(a mineraloid )
- Lodestone (a synonym of magnetite)
- Lublinite variety of calcite
Read more about this topic: List Of Minerals