Clear Quartz with Mica Cluster #71 measures approximately 1 15/16" x 1 5/16" x 1 1/8" (49mm x 33mm x 25mm) and weighs 2.1 ounces (54.2 grams). There are three crystals in this cluster, and the bottom (and a bit of the top) are covered with Mica which is probably Muscovite.
Mica allows you to see how flawed humanity is but still allows you to love humanity, so this is a good crystal for those who are in service. It provides clarity in visions. Mica can help you not "flick the switch" of anger and can help you dispel nervous energy. Lepidolite, one of the Micas, is particularly good for dispelling anger and nervous energy. It is a Lithium crystal.
Clear Quartz Crystal is one of two basic crystals I believe everyone should start with if you are a beginner in crystals. The other crystal is Selenite. Quartz is for everyone--from beginners to the very advanced. So is Selenite. These wonderful crystals can purify all parts of us--physical, emotional, and spiritual. They are, indeed, pure white light. Quartz can provide clarity of thought in order to influence your situation(s) and surroundings. It aligns your energy and brings you into a state of harmony. You can draw the energy of the Universe to you with one of these wonderful crystals. Be careful to use Quartz for "the good of all" and for "harm to none".
Quartz is very good for meditation and can bring you into contact with the ethereal plane or anywhere else you wish to go. You can clear all of your Chakras as well as activate them, but Quartz is especially good working with the Heart Chakra, Third Eye Chakra, and Crown Chakra.