Mr. Horner on th£ Mineralogy of the Malvern Hills, 291 



dant, and exhibits the distinctive characters of the simple mineral, to 

 that in which it is with difficulty perceptible, very little doubt will 

 remain of its existence in the latter. 



§ 20. This mineral is not of very common occurrence in its 

 simple state, and is probably less so as a constituent part of a rock ; 

 for it is not noticed as such in the Wernerian system, nor am I 

 aware of its being mentioned in any mineralogical work, except in 

 a very few instances. Brongniart, in treating of epidote says, *' This 

 *' mineral seems to belong exclusively to primitive countries, but it 

 " does not usually enter into the structure of rocks. It is found 

 *' crystallized in the fissures of these rocks, or in the cavities of veins, 

 " and even penetrates the substances composing the veins in all direc- 

 " tions; it is thus that it traverses carbonate of lime, quartz, &c."* 

 He does not however name any place where it is found to enter into 

 the structure of a rock. Saussure met with it not far distant from 

 Mont Blanc : " On the road," says he, " from Modane to Villa- 

 " rodin, in descending the hill above this village, I found in the high 

 " road and In the walls of the houses, stones of a very beautiful 

 ** green, sometimes mixed with white. The green parts, some of 

 " which are yellowish-green, having a sparkling lustre, granular and 

 " hard, are of the same nature as the green schorl of Dauphiny. 

 " This schorl I name Delphinite,t to distinguish it from some other 

 " green schorls of a very different nature. These yellowish parts are 

 *' therefore granular delphinite. The parts of a leek-green, which are 

 " included in this stone, and which have a schistose or lamellar struc- 

 *' ture, are hornblende. The white parts are crystalline and granular 



* Brongniart, Traite Eletnentaire dc Mineralogic, torn. i. p. 412. 



-f This substance has obtained a great variety of names. It is called Glassy Actyno- 

 litc by Kirwan, Thullitc by La Metherie, Akanticone by Dandrada, Pistazite by Weruer, 

 and Epidote by Hauy. 



2 o 2 



