The protolith may be a sedimentary rock, an igneous rock or another older metamorphic rock. Metamorphic rocks make up a large part of the Earth 's crust and are classified by texture and by chemical and mineral assemblage (metamorphic facies). They may be formed simply by being deep beneath the Earth's surface, subjected to high temperatures and the great pressure of the rock layers above it.
Onions and garlic belong to the allium family. The delicious foundation of may recipes, they also impart disease-fighting, health-promoting properties.. Think of your favourite savoury recipes. You would probably be hard-pressed to choose one that does not start by sauteing sautÃ©ing onions or, garlic or. both
All About Allium Vegetables. With the recent press on alliums such as onions and garlic protecting against both cardiovascular disease and cancer, we asked a friendly vegetable expert to tell us more about this family of vegetables.heir flavor, sometimes described as a blend of sweet onion and garlic, make them a favorite of gourmet chefs. Leeks (Allium ampeloprasum var. porrum) are the largest member of the allium family and look like gigantic scallions. They may grow up to two feet long and two inches thick, and they do not form a bulb.