Station - Identify the following igneous minerals

• Quartz - Assortment of colors, scratches glass and feldspar


• K feldspar - Pink, white and blue with perthite


• Plagioclase - Multiple shades of white to gray, striations


• Mica - Biotite and muscovite, flaky


• Amphibole and pyroxene - Dark with distinct cleavage


• Olivine - Green and granular

Are these minerals commonly found in sedimentary rocks?

What is a crystal?

How many crystals are in each sample?

• Single crystal - One


• Diorite - Many


• Obsidian - None


• Basalt - Many more than in the diorite

Moon rock