76 EARTHS. CALCAREOUS, xo. Creta. 



ORDER III. CALCAREOUS. 



Confifting principally of carbonate of lime, 



XO. CRFTA. Confifting of carbonate of lime and 

 carbonic acid gas, and a few extraneous fub- 

 fiances; friable, efFcrvefcing with and nearly 

 totally foluble in acids: calcining in the fire, 

 but not vitrifying in the ftrongeft degree of heat. 



conchacea. Containing fmall and very minute fliells npt cohering, not 

 foiling the finger?, without hi ftre. 

 Calx conchacca. Syji. nat. xii. 3. p- 206. 

 Humus conchacea. Crondii.min. Je^. 281, l,b. 

 Humus animalis conchacea. WalL/yH. i./. 24* ^* ^- ^' 

 Found on the maritime parts of Etruria, Saxonyy and li'irtem" 

 hurgy rarely covered with mould, 



gva»ulata» Confifting of rounded quite glabrous milk-white opakq 



granulations, which do not ftain the fingers. 

 Calx tellacea, &c. Sj/fi nat, xii. 3. p» 208. ». 8, 

 Found on the fhores of Afce%fion IJland, where it ferves as a ni- 

 dus for the Teltudo Mydas to lay its eggs in : it is compofed 

 of fhells and corals comminuted by (he Agaves of the Tea, or 

 of the harder calcareous fubftances worn down and rubbed 

 together by the torrents of riyers. 



Uitacta* Produced by comminuted fhells, without luftre, not ftain-r 

 ing the fingers. 

 Calx tellacea, &c. S^fi. nat, xii, 3. f, 207. », 4, 

 Found on (he coal^s of England and France, 



pul'veruhn^ Reducible to duft, without luftre, rough to the touch, 

 '* flaining the fingers. 



Native lime. Soiverby Brit^ min, I, tab, I. 

 Native lime. Kirtuan min, 1 . p. 74, 75, 



Found near Bathy white, without lul're or tranrparency, frac- 

 ture earthy, and eafily rubs to povyder: when mixed with 4 

 little oxyde of iron it becomes yellowifh. 



t^uamosa^ With fomewhat greafy fnow- white fhining fcales, which 

 foil the fingers. 

 Agaric mineral, var. 2. Kivwanmimr. i./. 76. 

 Found nesLrGera: very friable, falling to dull in water, adheres 

 to the tongue, and is entirely foluble in nitrous acid ; colour 

 fometimes filyery-whue. 



