That is, if you observe the spectrum of a star and can determine the wavelength where the emission peaks (Î»max), you can calculate that starâs temperature. Here is another copy of the plot that we studied in Lesson 3: Figure 4.1: Two-dimensional plot of the spectrum of a blackbody with different temperatures.
Igneous rocks usually contain the most crystals. The longer it takes the magma to cool, the larger the crystals.
The mineral crystals are large enough to see because the magma cools slowly, which gives the crystals time to grow. Figure 3.20: Granite is a type of rock that forms from magma. It contains the minerals quartz (clear), plagioclase feldspar (shiny white), potassium feldspar (pink), and other minerals.