Coriander seeds (which are a spice) are round and have fine longitudinal ridges. The seeds have a sweet heady aroma with a subtle whiff of pine and pepper.
Most Indian cooks will not alllow a savoury dish to leaves their kitchen without a good sprinkling of fresh, fragrant coriander leaves. This herb is most commonly used garnish in India. Little bunches of fresh coriander are commonly available at greengrocers. It looks like parsley but has a more vibrant aroma. Green chutney made by grinding coriander leaves, coconut, ginger, garlic and spices is a popular sandwhcih spread or meal accompaniment .