of the Island of St. Christopher, 265 



great violence, when the wind is from the northward. The reef 

 consists of common massive quartz and carbonate of hme ; it 

 is covered with coral, branching out in every direction, and 

 having an exceedingly beautiful appearance in calm weather. 



List and Description of Mineral Substances found in the 

 Island of St. Christopher. 



Common massive Quartz, white, with reddish brown veins, 

 shining vitreous lustre, fracture uneven, scratches glass, strikes 

 fire with steel. Found on the reef at Deep Bay, and in some 

 other parts of the island. 



Vesicular Lava, found in great abundance in the crater of 

 Mount Misery, and in many parts of the island ; of a blackish, 

 glassy appearance, with white specks, full of holes and cavities. 



Limestone, hard and compact, of a light brown colour, dull, 

 fracture flat conchoidal, passing to uneven, yields to the knife. 

 On the reef at Deep Bay, and in some other places. 



Sulphate of Lime, or Selenite, is found near the Salt Ponds, 

 white, shining [)early, semi-transparent, yields to the nail, 

 occurs massive, with straight lamellar structure. 



Olivine, and Leucite embedded in black Lava, is one of the 

 most common rocks in all parts of the country. It is very 

 hard and fine grained, of a dusky black, full of glistening 

 white specks, and uneven fracture. 



Leucite, embedded in red Lava, particularly prevalent in the 

 cliff at Old-Road Bay, giving the whole a red appearance ; 

 colour, several shades of red, with white and brown specks ; 

 hard, fracture uneven. A great quantity is found in a state of 

 decomposition, forming a red mould. 



Vesicular Lava, light reddish brown, with white specks, 

 rough and friable, full of holes and minute pores. 



Three varieties of Lithomarge : — 1. perfectly white, very 

 soft, falling readily to powder; 2. brown, speckled white; 

 3. flesh red ; both harder than the first : found in the crater, 

 and the last in some other places, particularly on the hills 

 north-east of Basse-terre. This is dull, earthy, unctuous to 

 the touch, adheres strongly to the tongue, and contains a great 

 quantity of magnesia. 



