PRISMATIC MIEMITE. 105 Second Subspecies. Prismatic Miemite. Stanglicher Bitterspath, Klaproth. Strahliger Kalkstein, Von Schloltheim, Hoff’s Magaz. fur die Gesammte Mineralogie, b. i. s. 156.—Stanglicher Bitterspath, Klaproth, b. iii. s. 297* Id. Leonhard, Tabel. s. 36. Id. Haus. s, 128. Id. Lenz, b. ii. s. 712. Id. Oken, b. i. s. 393. External Characters. Its colour is asparagus-green. • It occurs in low, nearly rectangular tliree-sided pyra mids, which are deeply truncated on all the edges. The crystals are small, and very small, and sometimes they form only drusy crusts. The tetrahedrons adhere their bases, and are sometimes reniformly aggregated. The lateral >planes of the tetrahedrons are granular, and only glistening; but the truncating planes are smooth, and splendent and pearly. Internally it is shining and vitreous. I'he fracture passes from concealed foliated to splin tery. The fragments are rather blunt-edged. It occurs in prismatic distinct concretions. It is strongly translucent. It is semi-hard in rather a high degree. It aifords a greyish-white coloured streak. Specific gravity, 2.885, Karsten. Chemical