English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The new mineral plumbophyllite, Pb 2 Si 4 O 10 ·H 2 O, is orthorhombic with space group Pbcn and cell parameters a = 13.2083(4), b = 9.7832(3), c = 8.6545(2) Å, V = 1118.33(5) Å 3 , and Z = 4. It occurs as colorless to pale blue prismatic crystals to 3 mm, with wedge-shaped terminations at the Blue Bell claims, about 11 km west of Baker, San Bernardino County, California. It is found in narrow veins in a highly siliceous hornfels in association with cerussite, chrysocolla, fluorite, goethite, gypsum, mimetite, opal, plumbotsumite, quartz, sepiolite, and wulfenite. The streak is white, the luster is vitreous, the Mohs hardness is about 5, and there is one perfect cleavage, {100}. The measured density is 3.96(5) g/cm 3  and the calculated density is 3.940 g/cm 3 . Optical properties (589 nm): biaxial (+), α = 1.674(2), β = 1.684(2), γ = 1.708(2), 2V = 66(2)°, dispersion r &gt; v (strong); X = b, Y = c, Z = a. Electron microprobe analysis provided PbO 60.25, CuO 0.23, SiO 2  36.22 wt%, and CHN analysis provided H 2 O 3.29 wt% for a total of 99.99 wt%. Powder IR spectroscopy confirmed the presence of H 2 O and single-crystal IR spectroscopy indicated the H 2 O to be oriented perpendicular to the b axis. Raman spectra were also obtained. The strongest powder X-ray diffraction lines are [d (hkl) I]: 7.88(110)97, 6.63(200)35, 4.90(020)38, 3.623(202)100, 3.166(130)45, 2.938(312/411/222)57, 2.555(132/213)51, and 2.243(521/332)50. The atomic structure (R 1  = 2.04%) consists of undulating sheets of silicate tetrahedra between which are located Pb atoms and channels containing H 2 O (and Pb 2+  lone-pair electrons). The silicate sheets can be described as consisting of zigzag pyroxene-like (SiO 3 ) n  chains joined laterally into sheets with the unshared tetrahedral apices in successive chains pointed alternately up and down, a configuration also found in pentagonite.

Plumbophyllite, a new species from the Blue Bell claims near Baker, San Bernardino County, California