Clear Quartz Tumbles #1 measure approximately 13/16" to 1 1/8" (21mm to 30mm) and weigh approximately .1 to .3 ounces (3.5 to 6.5 grams). These are very good quality, and they are very clear. They are a perfect size for Medicine Bags. Please let me pick one for you. These are $1.00 USD each.
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.