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.
Marjoram is an herb in the mint family with long, ovular leaves that have a delicate, sweet flavor. While marjoram is considered interchangeable with oregano in some cultures, other varieties, such as sweet marjoram, taste perceptibly different. When cooking with marjoram, use only the leaves, and discard the stems. Marjoram's versatility lends it to a broad variety of usages.