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.
What Does Market Cap Mean. The market cap of a company is the total value of of company based on the last known price. It is calculated by multiplying the numbers of shares outstanding by the last known stock price. Not all companies can be valued based on its market capitalization; however this is a good method to approximate the value.
Market caps is just the share price, multiplied by the number of shares. It doesn't represent any value (if people decide to pay more or less for the shares, the market cap goes up or down). It does represent what people think the company is worth. NAV sounds very much like book value.