More than 90% on the crust is composed of silicate minerals. Most abundant silicates are feldspars<span> (</span>plagioclase<span> (39%) and alkali feldspar (12%)). Other common silicate minerals are </span>quartz<span> (12%) </span>pyroxenes<span> (11%), </span>amphiboles<span> (5%), micas (5%), and clay minerals (5%).</span>
This is false. Absolute brightness is the term used to describe how bright a star would look if it were a standard distance from Earth. Apparent brightness is how bright it would look as far as it currently is from Earth. Hope this was helpful!
