Lithiophilite is a lithium mineral with formula LiMnPO4 that make a serie with triphylite, the iron end member. The mineral with intermediate composition is known as sicklerite Li(Mn,Fe)PO4. Usually it is found in microcrystals of orange colour in pegmatites and is quite difficult differentiate the three minerals.
When is included in quartz has a characteristic blade shape very similar to Biotite crystals. In general Biotite is more greenish and Lithiophilite is more brownish, but altered biotites are also brown. A distinctive character is that Lithiophilite shows a lace of curved micro-fractures at the edge of the crystal while biotite do not.