1 Aphanitic igneous rocks have a fine-grained texture and most of their crystals are too small to see with the naked eye. 2  You will need to use a magnifying glass to observe the crystals in aphanitic rocks. 3  Igneous rocks that form too quickly for crystals to form have what is called a glassy texture. 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.
Market capitalization (or market cap) is a fairly common financial phrase. You may have seen stocks or mutual funds described as small-cap, mid-cap or large-cap on financial news websites. Or you may have read newspaper headlines referring to the market cap of a particular company, industry or region.
Also known as market cap, market capitalization is the total market value of a company's outstanding shares of stock. For example, you may have heard Apple referred to as the most valuable company in the world. That's because Apple currently has the highest market cap of any publicly traded company.