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.
DEFINITION of 'Small Cap' Small cap is a term used to classify companies with a relatively small market capitalization. A company's market capitalization is the market value of its outstanding shares. The definition of small cap can vary among brokerages, but it is generally a company with a market capitalization of between $300 million and $2 billion. BREAKING DOWN 'Small Cap' One of the biggest advantages of investing in small-cap stocks is the opportunity to beat institutional investors. Because mutual funds have restrictions that limit them from buying large portions of any one issuer's outstanding shares, some mutual funds would not be able to give the small cap a meaningful position in the fund.