...P. H. Ribbe; G. V. Gibbs; M. M. Hamil Abstract The crystal structure of dioptase, Cu 6 [Si e O 18 ]-6H 2 0 ( a = 14.566, с = 7.778 A, R 3 ), was refined to R = 0.039 using 969 non-zero reflections. The structure consists of puckered trigonal rings of six water molecules with an ice-like...

...F. W. Galbraith; Truman H. Kuhn Abstract Dioptase (H 2 CuSiO 4 ), a mineral of comparatively rare occurrence in the United States and previously described from only a few localities in Arizona, 1,2,3,4 was recently discovered in considerable quantity at the Mammoth Mine of the Mammoth-St. Anthony...

...Arthur P. Honess Abstract Several minerals of the hexagonal-alternating type have been investigated with reference to etch figures. Traube 1 obtained distinct figures on the negative rhombohedron of the first order of dioptase with KOH. These are triangular in outline, with the three sides unequal...

...Figure 2. 29 Si NMR spectra for dioptase and dehydrated dioptase, with spinning speeds labeled. The offset of the peak from 20 to 10 kHz (arrow) is caused by a reduction in temperature of about 26 °C at the lower spinning speed. The complex MAS peak shapes for the hydrated sample may be due...

... particularly with murdochite, but also with calcite, fluorite, hemimorphite and rarely dioptase in a highly siliceous hornfels. It forms bright bluish-green plates or flakes up to ~20 μm ×20 μm ×5 μm in size that are usually curved. The streak is pale bluish green and the lustre is adamantine, but often...

... also collected X-ray absorption fine structure (XAFS) data for several Cu 2+ -containing model compounds, including tenorite ( VI CuO), spertiniite [ VI Cu(OH) 2 ], dioptase ( VI CuSiO 2 ·H 2 O), shattuckite [ VI Cu 5 (SiO 3 ) 4 (OH) 2 ], chrysocolla [ VI (Cu,Al) 2 H 2 Si 2 O 5 (OH) 4 ·nH 2 O], and Cu...

...W. John McLean; Richard A. Bideaux; Richard W. Thomssen Abstract Yedlinite is a new hydrated oxychloride of lead and chromium found associated with diaboleite, quartz, wulfenite, dioptase, phosgenite, and wherryite on specimens from the Mammoth Mine, Tiger, Arizona. Yedlinite occurs as prismatic...

... 0.05, and insoluble 1.11, yields the formula Cu 6 PbO 8 . The specific gravity is 6.47 at 4° C. The mineral forms in tiny lustrous black octahedra associated with wulfenite, dioptase, willemite, and fluorite. The new mineral was found by Percy W. Porter, now deceased, of Cavecreek, Ariz., and at his...

... counterpart, the mineral dioptase, Cu 6 Si 6 O 18 ·6H 2 O, or between the Cu polygermanate CuGeO 3 and synthetic germanate dioptase, Cu 6 Ge 6 O 18 ·6H 2 O. The compounds CuSiO 3 and CuGeO 3 , known as spin-Peierls phases, have been recently identified as isostructural with theoparacelsite ( Otto...

..., mica mineral, illite N-13 Gmelinite–Na, kaoliniteWX, goethite Quartz, montmorillonite, alkali feldspar, illite–montmorillonite, magnetite, kaolinite, hematite, mica mineral, illite O-5 Goethite, gmelinite–Na, halloysite Dioptase Quartz, montmorillonite, kaolinite, alkali feldspar...

... not drilled deep enough to ascertain and correlate the tripolite occurrence. Characteristic red staining was observed on a core of chat in wells G, H, and I ( Liner, 2015 ), and probably in well D. XRF analysis of these red stains in well I shows the presence of 2% dickite, 25% dioptase, 36% kaolinite...

... = 1.5 cm. (d) Keyite, Level Scale bar = 0.3 mm. (e) Olivenite with gartrellite. Scale bar = 1 cm. (f) Conichalcite, molbdofornacite with dioptase. Scale bar = 1 cm. (g) Legrandite on matrix. Scale bar = 1 mm. (h) Mimetite. Scale bar = 1 cm. ...

... interaction. Note that the libration modes of H 2 O in dioptase were observed at 613 and 732 cm −1 ( Goryainov, 1996 ); such values are close to the corresponding modes in natrolite ( Table 3 ). For the M-1 model the diagonal force constants are K (Al-O) = 3.2 mdyn/Å, K (O-Si-O) = 0.89 mdyn·Å, K (O...

... daphnite not listed Dat datolite G Dbr daubreelite G Dee deerite A Dia diamond G Dsp diaspore G Dck dickite G Dg digenite A Di diopside A Dpt dioptase G Dol dolomite G Drv dravite G Dum dumortierite G Eas eastonite Rd Ec ecandrewsite...