BOTRYOLITE. 239 Gtognoslic and Geographic Situations. It is associated with large foliated granular calcareous spar, more rarely with violet-blue fluor-spar, and some times with apple-green prehnite, with which it occurs in beds, in a variety of mica-slate, subordinate to gneiss at Arendal in Norway. It has also been found in small veins in greenstone on the Geisalpe, near Sonthofen. Observations. 1. It was first observed and described by Esmark, who met with it at Arendal 2. It resembles l’rehnite, both in external aspect and in geognostic situation. 2. Botryolite. Botryolith, Hausmann. This species is divided into two subspecies, viz. Fibrous Botryolite, and Earthy Botryolite. First Subspecies. Fibrous Botryolite. Fasriger Botryolith, Hausmann. Basrigcr Botryolith, Hans. s. 122 —Chaux boratee silice concre* tionnec-innnicllonne, Haup, Tabl. p. 17.—Fasriger botry °lit, Lcnz, b. ii. s. 858.—Botryolite, Aikin, p. 127- External Characters. Externally it is pearl-grey, and yellowish-giey , inter nally greyish, milk, and reddish white, which passes into I'ale rose-red. The colours are in concentric stripes. n 2 rt