Mark Block, proprietor of Mark Block Fine Art and Antiques (www.blockglass.com), is a long-time collector of rocks, gems, and minerals. His collection focuses on varieties of quartz, fluorite, and turquoise.
Schiffer Publishing, Ltd. processes all European orders via their overseas partner Gazelle Book Services.
We welcome you to browse Schiffer's titles at Gazelle's website,
and place your order with them directly.