SCALY A PH RITE. 119 It occurs massive, disseminated, in membranes, or ex tremely delicate crusts, and in small tuberose friable pieces. It occurs sometimes solid, sometimes friable, and of ten of an intermediate degree of coherence. Externally it is strongly glimmering; internally glis tening, and pearly, inclining to semi-metallic. The friable varieties consist of scaly parts; the more solid have a fracture which is curved slaty, passing into undulating foliated. The more compact varieties very rarely appear in im perfect small granular conci'etions. It is opaque. It soils. It is very soft, passing into friable. It feels soft, and almost greasy. It is very light; the scaly varieties supernatant. Chemical Characters. It falls into pieces, with a crackling noise, when put into water. Owing to its loose texture, it effervesces most violently with acids. It is a nearly pure carbonate of lime. Geognoslic Situation. It occurs in nests, disseminated, or in small veins, in the first fluetz limestone. Geographic Situation. It is found in Thuringia, and Ilessia. Observations. E This mineral was formerly confounded with Nacrite, lrom which it differs in external characters, geognostiv: situation, and chemical composition. II 4 2. According