Natural menthol crystals (dl-menthol) are produced through mint essential oil (mentha arvensis) extraction, the oil is quick frozen and the menthol crystallizes out. The crystals are crystalline in form, more oblong, similar to rock crystals. They are clear to white with a cool minty fresh odor. Soluble in alcohol and oils. Melting Point: 42-44�°C (107â??111�°F). Phthalate-free. Purity 99.7%. USP grade. Menthol Crystals are colorless prismatic crystals derived from steam distilled peppermint oil. They give a fresh, cool and tingling sensation to lotions, creams, ointments and balms. Menthol crystals dissolve in oil and alcohol bases only. These can be used in shower steamers, foot soak, scrubs and balms. Used in cosmetics containing peppermint to boost its cooling and freshening effects. A little goes a long way!