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.
Market Cap Definition: Market cap (i.e. market capitalization) is the total market value of the company's outstanding shares. To calculate a company's market cap, you simply take the current stock price and multiply it by the total number of shares outstanding. For example, if Apple (AAPL) had 935 million shares outstanding and its stock price was $570 per share, its market cap would be $532.9 billion (935 times $570). Market cap is often used by investors to obtain a quick estimate as to a company's overall value.