1. Introduction and General Features of W-Sn Skarns. 2. The Meanings and Features of W-Sn Skarns. 3. Metamorphic Skarns in W-Sn Ore Skarn Environments. 4. Some General Features of W-Sn Skarns. 5. The Geochemistry and Mineralogy of W and Sn in Skarns. 6. W-Sn Related Granitoids and their Alteration. 7. Proximal W-Skarns. 8. Proximal Tin Skarns. 9. Greisenized, Greisen, and Distal Sn-Skarns. 10. Tungsten Skarns in Regionally Metamorphosed Sequences unrelated to Plutons. Bibliography. Author Index. Location Index. Subject Index.