LAUMONITE. 329 Chemical Characters. It forms a jelly with acids. According to Vogel, it dissolves with effervescence in cold muriatic and nitric acids, and the solution immediately forms a transparent jelly : it dissolves in sulphuric acid slightly heated, and forms with it a white-coloured opaque jelly. Before the blowpipe it intumesces, and is changed into a pearly shining compact mass. Constituent Parts. Silica, 49.0 Alumina, 22.0 Lime, 9.0 Water, 17.5 Carbonic Acid, 2.5 100 Geosrnoslic and Geographic Situations. O Europe. This mineral was first found, in the year 1785, in the lead-mines of Huelgoet in Brittanny, by M. Gillet Laumont, a distinguished French mineralogist. Since that period, it has been discovered in other parts of the world. It is found, along with cubicite, in amygda loid, near Paisley in Renfrewshire, and in a similar rock in the counties of Fife and Perth. At Portrush in Ire land, it is an inmate of trap-rocks, along with crystals of foliated zeolite and cubicite; and in amygdaloid in the Faroe Islands. It has been brought from Dupapiatra, near Zalathna in Transyslvania; and it is contained in the amygdaloid of the Vicentine; it likewise accompanies the beautiful apatite of St Gothard. Asia.—It is said to occur in China, along with prehnite. Observations,
