Gems Notes and Extracts Augusto Castellani, Mrs. John Brogden 1871

238 GEMS.7th. Of felspars:amongstits varieties are :1. The adularia. 6. The cyanite.2. The amazzonite. 7. The clorophane.3. The argentina.8. The labrador.4. The argirite. 9. The variolite.5. The axinite. 10. The porphyry.To the eighth genus of non -aluminous silicates belongthe speciesare:1st. Of the silicate of zirconia :amongstits varieties1. The jacinth.I 3. The essonite.2. The jargoon.2nd. Of the silicate of magnesia amongst its varie-:ties are :1. The chrysolite.4. The spuma marina,3. The peridot.2. The olivina.or sea froth.To the ninth genus of united silicates and othercomposites belong the species1st. Of the fluoriferous silicates :amongstits varietiesis found :The topaz.2nd. Of the sulphuric silicate :amongstits varietiesare found :1. The lapis-lazuli. |2. The lazulite.