XXIV 



CONTENTS. 



1. Loofe . — 



2. Semi-indurated ■ • 



3. indurated . 



F. United with a metallic calx 



j. With iron. White iron ore 



2. With copper - 



3, With lead 



2. Siliceous 



A. The diamond 



1. Colourlefs • 



2. Red, or the ruby . 



B. The fapphire 



C The topaz 



1. Yellow 



2. Ye] lowifh green. The Ghryfolite 

 7. Blueifh green. The Bervll 



D. 



E. Quarts 

 I.. Pure 



A. Solid I 



B. Grained \ 

 G. Sparry 

 D. Criftallifed 



SECT. 



XXVI.. 



XXVIL 



XXVIIL 



XXIX. 



XXX. 



XXXIV. 



XXXVII. 



XL 



The emerald 



2. Impure quartz 



A. Mixed with a black martial clay 7 



B. with a red copper calx J 



F. Flint 



.1. The opal 



A. The fangenon 



B. The white opal 



C. The cat's eye 



1. The onyx 



3. The chalcedony 



The carnelian 

 The fardonyx 

 The agate — — 



XLII. 

 XLIII.. 

 XLIV. 



XLV. 



XLVI. 



XLVII. 



XLVIII. 



L. 



LI. 



LL 



LIL 



LIIL. 



LIIL. 



LIV.. 



4. 



5- 

 6. 



% 

 8. 



The common flint 



Chert * 



G, Jafper. >■ - 



1. Pure — ■■ ' 



2. Martial 



II, Rhombic quartz or feltfpat 



LV.. 



LVL 

 LVIL. 

 LVIII. 

 LIX.. 

 LX. 

 LXL 

 LXIII. 

 LXIV. 

 LXIV. 

 LXV. 

 LXVI. 

 3. The. 



