Market: from the casual rock-picker to the serious collector Popular, proven, best-selling format: The Adventure Quick Guides series has sold more than 70,000 copies Not intimidating-easy-to-use information geared toward casual observers Covers 72 of the most common and desirable rocks and minerals in California with simple guidelines for identifying them, as well as how to tell similar materials apart from each other Tabs labeled by physical appearance (e.g. glassy or metallic): When you see a rock or mineral, turn to the correct group and view just a few specimens at a time to make a positive ID Includes information about famous California minerals that are too rare to find but are common in rock shops/museums (e.g. gold and mercury ores) Professional photographs that focus on the details needed for easy identification Customers want these attractive Quick Guides-they're pocket-sized, portable, and durable with an appealing layout