| LABRADORITE (Calcium Sodium Aluminum Silicate) | |
| 0 | LARDERELLITE (Ammonium Borate Hydroxide) |
| 0 | LARIMAR (variety of Pectolite) |
| 0 | LAUEITE (Hydrated Manganese Iron Phosphate Hydroxide) |
| LAUMONTITE (Hydrated Calcium Aluminum Silicate) | |
| 0 | LAURIONITE (Lead Chloride Hydroxide) |
| LAZULITE (Magnesium Aluminum Phosphate Hydroxide) | |
| LAZURITE (Sodium Calcium Aluminum Silicate Sulfate) | |
| LEAD (Pb) | |
| LEADHILLITE (Lead Sulfate Carbonate Hydroxide) | |
| LECHATELIERITE (Silicon Dioxide) | |
| LEGRANDITE (Hydrated Zinc Arsenate Hydroxide) | |
| LEIFITE (Hydrated Sodium Beryllium Aluminum Silicate Hydroxide Fluoride) | |
| LEPIDOLITE (Potassium Lithium Aluminum Silicate Hydroxide Fluoride) | |
| LEUCITE (Potasium Aluminum Silicate) | |
| 0 | LEUCOCHALCITE (variety of Olivenite) |
| LEUCOPHANITE (Sodium Calcium Beryllium Silicate Fluoride) | |
| LIBETHENITE (Copper Phosphate Hydroxide) | |
| 0 | LIMESTONE (a common sedimentary rock) |
| LIMONITE (Hydrated Iron Oxide Hydroxide) | |
| LINARITE (Lead Copper Sulfate hydroxide) | |
| LINNAEITE (Cobalt Sulfide) | |
| 0 | LIROCONITE (Hydrated Copper Aluminum Arsenate Hydroxide) |
| LITHIOPHILITE (Lithium Manganese Iron Phosphate) | |
| LOLLINGITE (Iron Arsenide) | |
| LORENZENITE (Sodium Titanium Silicate) | |
| 0 | LARIMAR (variety of Pectolite) |
| LUDLAMITE (Hydrated Iron Magnesium Manganese Phosphate) |