20 GEOLOGICAL MEMOIRS. 



veins, parallel with the line of contact of the limestone and the 

 granitoid rock, and following all the sinuosities of the latter. These 

 minerals are Pyroxene*, Mica, and Pyrosklerite, which is white or 

 greenish, and in some cases penetrates the limestone in the form of 

 dendrites. Occasionally there is a little Amphibole, Quartz, and 

 Graphite, the last in deep black, microscopic scales, rather rare. 

 Spinelle also occurs, sometimes, in small octahedrals, bluish grey and 

 transparent. MM. Puton and Fournet have also observed Condro- 

 dite in small orange-yellow concretions. 



Lavelme. — Several masses of saccharoid limestone occur near 

 Laveline. This is a variety of the foregoing, lamellar, greyish white 

 or light bluish grey. "White felspar is often developed as veins, 

 which are sometimes parallel, sometimes irregular. When the veins 

 are very abundant, the limestone passes insensibly into the enclosing 

 gneiss, the mineralogical composition of which does not difPer from 

 that given by M. Naumanu for gneiss generally. The Laveline 

 limestone, like most crystalline limestones, when bruised exhales a 

 foetid and bituminous odour. It contains Pyrosklerite, Tremolite, 

 Mica, magnetic and ordinary Iron-pyrites, and a great number of 

 minute grains of Graphite. 



Sphene also occurs, in microscopic brown crystals. Quartz is often 

 found forming veins or minute agglomerations, with very irregularly 

 indented outlines, the crevices of which are occupied either by felspar 

 or limestone. Pyrosklerite also accompanies these quartzose bodies 

 at some points where the felspar is in contact with the surrounding 

 limestone. When treated with acid, the limestone of Laveline is 

 found to contain a large proportion of minerals, disseminated in the 

 mass or developed within it as dendrites. Amongst these are Felspar 

 and Quartz, which contribute to its hardness and stand out on the 

 weathered surfaces. This limestone is quarried for the marble- works 

 of Epinal. 



A limestone exactly similar to that of Laveline, and also enclosed 

 in gneiss, is met with at Gemaingoutte, above Velupaire. 



St. Philippe. — The saccharoid limestone of the gneiss is well seen 

 below the old workings of St. Philippe, near St. Marie aux Mines 

 (Haut-Rhin) ; and the quarry in which it is worked (for lime-burn- 

 ing) contains such a variety of minerals that it forms quite a minera- 

 logical museum. The limestone and the gneiss are separated more 

 distinctly than at Laveline ; nevertheless, the former is largely 

 charged with a reddish-brown mica, which also occurs in the latter, 

 and, in some sort, constitutes a passage from the limestone to the 

 gneiss ; and there are, moreover, many alternations of the two rocks, 

 as may be seen in the old quarries higher up. The minerals are 

 pretty generally developed in the limestone, and evea in the gneiss, 

 as veins, parallel to the line of junction and the lamination of the two 

 rocks f, which dip to the S.E., at an angle of about 20°. 



The St. Philippe limestone is composed of white crystalline la- 

 mellae entangled in every direction : it is only in the fissures or in 



* These minerals are described in detail by M. Delesse, I. c. p. 144 &c. 

 t See PL X. fig. 12. of M. Delesse's Memoir. 



