MINERALOGICAL CHEMISTRY. Mineralogical Chemistry. ii. 59 Litharge from Zarshuran Persia. ALEXANDER SCOTT (Min. Mag. 19 14 1 7 143-1 46).-The specimen described is from a mineral vein which has long been worked for orpiment near the Zarshuran River in Kurdistan. It is red with a yellowish-brown streak and is in part crystalline with a laminated structure. The optical characters of cleavage flakes suggest orthorhombic symmetry. Analysis gave PbO. CuO. Sb,O,. P,05. CO,. Total. Sp. gr 97.17 2.61 0.30 trace trace 100.08 8'61 Red and yellow crystalline modifications of lead monoxide haveii. 60 ABSTRACTS OF CHEMICAL PAPERS. been prepared artificially but there is solm0 confusion in the crystallographic descriptions of these. A New Locality for Voelckerite. AUSTIN F. XOGERS (Min.Mclg. 1914 17 155-162).-Careful determinations of the amount of water present in apatites which are deficient in fluorine and chlorine prove that these elements are replaced isoniorphously by oxygen rather than by hydroxyl the general formula of minerals of the group being 3Ca,(P0,),,Ca(F,,Cl,,0JC03). For members of the group in which the oxygen atom predominates the author has proposed the name voelckerite (A. 1912 ii 565). The following analysis by G. W. Jordan is given of voelckerite from a rneta- morphic glaucophane-bearing rock from Calaveras Valley Santa Clara Co. California. The mineral is white and subtranslucent with an imperfect cleavage and faint lustre D 3-06. Deducting a portion of the carbon dioxide as present in admixed calcite the amount of CO is calculated as 0.35 and the excess of oxygen as 1.49% CaO.A1,0,. FeO. P,05. H,O. CO,. Insol. Total. 54-46 1.35 0.24 41'47 0.22 1.03 0.53 99.30 L. J. S. L. J . s. Pintadoite and Uvanite Two New Vanadium Minerals from Utah. FRANK L. HEW and WALDEMAR T. SCHALLER (J. Kashington Acad. Xci. 1914 4 576-579).-Pintadoite occurs as a thin green efllolrescence on the sandstone cliffs of Caiion Pintado San Juan Co. Utah. Under the microscope it is slightly pleochroic and has moderate t o high birefringence. It dissolves slowly in cold water. Analysis I gves the formula 2Ca0,V20,,9€120 U03. CaO. MgO. K,O. V205. P20,. As,O,. H,O. Insol. Total. I. - 2 2 6 - - 42.4 - - 35.0 - 100.0 11. 39.60 1-73 0.04 0-30 37-70 0'06 0-05 18-28 1.24 99.00 Uvanite occurs as a brownish-yellow powder disseminated in sandstone a t Temple Rock Emery Co.Utah. 11; resembles carnotite in appearance and mode of occurrence but i t has not the clear yellow colour characteristic of carnotite. Under the micro- scope the minute crystalline particles show a high birefringence. The mineral is not soluble in water but it dissolves very quickly in ammonium carbonate solution. Analysis I1 agrees with 2U0,,3V20,,15H20. L. J. S. Barkevikite from Lugar Ayrshire. ALEXANDER SCOTT (Mi%. Mag. 1914 17 138-142).-Black lustrous prismatic crystals of barkevikite occur in a rock called lugazite. The optical characters are in agreement with those of the original barkevikite from Barkevik in Norway. SiO,. TiO,. A1,03. Fe,O,. FeO. MnO. MgO. CaO. Na20. K20. H,O. Total. 42.48 2.90 8:58 6-81 15'62 0-39 2-78 13-45 6'32 0.60 0.25 100.18 The relation of barkevikite to other members of the amphibole group is discussed.D 3.298 ; a.nalysis gave L. J. S.ANALYTICAL CHEMISTRY. ii. 61 Meteorites of Uwet and Angela Re-determination of Nickel and Iron in the Baroti and Wittekrantz Meteoric Stones. G. T. PRIOR (Min. Mag. 1914 17 127-234).-A mass of iron weighing absut 55 kilos. fell about ninety years ago a t Uwet in Southern Nigeria. An etched slice shows well-marked Neumann lines together with needles of schreibersite and nodules of troilite. The iron belongs t o the normal hexahedrite group of the type of Braunau. Several masses of iron the largest weighing 4341 grams have been found embedded in the caliche at the Angela Nitrate Works near Santa Catalina Iquique Chili. This iron is an ataxitel con- taining a comparatively low percentage of nickel (anal. 11)) and characterised by its extraordinary richness in schreibersite (amount- ing t o nearly a quarter of the mass); i t is probably identical with La Prirnitiva (A. 1898 ii 391) Analysis I corresponds with Fe,,Ni. Fe. Ni. Go. Cu. P. C. Total. Sp. gr. I. 93.36 5-78 0.75 nil 0.25 0.03 100.17 7.862 11. 95.03 4.52 0.65 - trace trace 100-20 7.892 The separation of iron and nickel by means of ammonia is found to be incomplete even after several precipitations. Triple precipita- tion of the iron with sodium acetate and subsequent precipitation with ammonia gives more accurate results ; the percentages previously given for the Baroti and Wittekrantz meteorites (A. 1914 ii 64) are now corrected. L. J. S.