Vlll TABLE OF CONTENTS. XXVII. Hallite Family. 1. Cryolite, ------ 299 CLASS II.—SALINE MINERALS. FOSSIL SALTS. Order I. Earthy Salts. Genus 1. Salts of Alumina. 1. Alum, ------ 304 2. Rock-Buttcr, - 306 Genus 2. Salts of Magnesia. 1. Epsom Salt, - 308 Order II. Alkaline Salts. Genus 1. Salts of Soda. 1. Natron or Soda. 4. Rock-Salt. Common Natron, 311 Rock-Salt, - 320 Radiated Natron, 314 Lake-Salt, - 327 2. Glauber Salt or Sulphate 5. Borax, - - 328 of Soda, - - 316 6. Sassoline, or Native Bor- 3. Reussite, - - 319 acic Acid, - 330 ' Genus 2. Salts of Potash. 1. Nitre, - - - - ■ ■ 332 Genus 3. Salts of Ammonia. 1. Sal Ammoniac, or Muriate Conchoidal Sal Am- of Ammonia, - 335 moniac, - 337 Volcanic Sal Ammo- 2. Mascangine, or Sulphate niac, - 335 of Ammonia, - 339 Order III.