I agree with everything BurntBear wrote! Zinc is found most commonly in Metamorphic and Igneous rocks and you have both in Arkansas. Also, Quartz is most often found in these as well but can be also found in Sedimentary rocks. You are probably not all that far from Hot Springs where a lot of Gem quality Quartz is found and mined. In fact, some of the finest Gem quality Quartz comes from Ron Coleman's and Jim Coleman's Quartz Mines just outside of Hot Springs. They often find enormous clear Quartz Crystals and even large Geodes filled with beautiful Quartz Crystals. Keep looking and you may find some extremely large specimens cover with Gem quality clear Quartz Crystals.
Frank