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.
Although it is called marjoram, pot marjoram (Origanum onites) is a species of oregano. It has a sharp flavor that is stronger than other types when its leaves are used fresh. Pot marjoram is a shrubby perennial, growing to 2 feet tall with small gray-green leaves.lthough it is called marjoram, pot marjoram (Origanum onites) is a species of oregano. It has a sharp flavor that is stronger than other types when its leaves are used fresh. Pot marjoram is a shrubby perennial, growing to 2 feet tall with small gray-green leaves.