1 Igneous rocks that form too quickly for crystals to form have what is called a glassy texture. 2  Obsidian is the only glassy igneous rock, and can be identified by its dark color. 3  This looks like dark black glass. An example of an intrusive rock is granite. 2  When magma is above the earth's crust, it is known as lava. 3  Extrusive rocks form through very fast cooling of lava above the Earth's surface. 4  Extrusive rocks have very small, almost microscopic crystals.
A bittersweet, mild spice, marjoram is common in German and Polish cooking, where it is an important part of the spice mixture for sausage. It is also found in the popular English dish of roast goose with chestnut stuffing.
Origins and extraction. Sweet marjoram is cultivated for the production of essential oil in Egypt, France, Germany, Hungary, Tunisia, Spain and more recently in the USA. In the south of France, harvesting usually takes place between August and September when the flowers are in full bloom.