Topic
Lavendulan
About: Lavendulan is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 80 citations.
Papers
TL;DR: Ondrusite as discussed by the authors is a triclinic triconvexite that is a new supergene mineral species from the Geister vein (Rovnost mine) and the Keschieber vein (Svornost mine), at the Jachymov (St.Joachimsthal) mine, Czech Republic.
Abstract: Ondrusite, CaCu4(AsO4)2(AsO3OH)2 . 10H2O, is a new supergene
mineral species from the Geister vein (Rovnost mine) and the
Geschieber vein (Svornost mine), at the Jachymov (St.
Joachimsthal) ore district, Czech Republic. It is commonly
associated with lindackerite, geminite, lavendulan, slavkovite,
strashimirite, olivenite, picropharmacolite and kottigite. It
forms white, whitish green, grey-green or apple-green
crystalline crusts or aggregates composed of fine platy or
lath-shaped translucent crystals up to 2 mm in size, on
fissures of partly weathered mineralized quartz veins. It has a
white to greyish white streak with a greenish tint, and a
vitreous luster; it does not fluoresce under both short- and
long-wave ultraviolet light. Cleavage on {001} is perfect, the
Mohs hardness is similar to 2-3, and the mineral is very
brittle with an irregular fracture. Ondrusite is triclinic,
space group P-1, a 6.432(1), b 7.986(1), c 10.827(1) angstrom,
alpha 85.75(1), beta 81.25(1), gamma 85.04(1)degrees, V
546.6(1) angstrom3, Z = 1. The chemical analyses by electron
microprobe and the thermal analysis for H2O yielded MgO 0.42,
CaO 5.27, NiO 0.03, CoO 0.08. CuO 29.90, PbO 0.16, P2O5 0.33,
As2O5 44.92, H2O 19.40, for a total of 100.51 wt.%. The crystal
structure of ondrusite was solved by direct method and refined
to a R1 index of 9.80% based on all 2888 reflections collected
on a single-crystal diffractometer with MoKalpha X-radiation.
The crystal structure consists of CuO6-AsO4-AsO3OH chains two
polyhedra thick that form sheets connected through the bridging
CaO6 octahedra. In the sheet-to-sheet bonding, CaO6 octahedra
and AsO4 groups are involved, whereas the AsO3OH groups bond
the CuO6 polyhedra only. One other H2O group is located between
the sheets.
12 citations
TL;DR: Raman and infrared spectroscopy has enabled insights into the molecular structure of the sampleite group of minerals as mentioned in this paper, which are based upon the incorporation of either phosphate or arsenate with chloride anion into the structure and as a consequence the spectra refect the bands attributable to these anions.
Abstract: Raman and infrared spectroscopy has enabled insights into the molecular structure of the sampleite group of minerals. These minerals are based upon the incorporation of either phosphate or arsenate with chloride anion into the structure and as a consequence the spectra refect the bands attributable to these anions, namely phosphate or arsenate with chloride. The sampleite vibrational spectrum reflects the spectrum of the phosphate anion and consists of ν1 at 964, ν2 at 451 cm-1, ν3 at 1016 and 1088 and ν4 at 643, 604, 591 and 557 cm-1. The lavendulan spectrum consists of ν1 at 854, ν2 at 345 cm-1, ν3 at 878 cm-1 and ν4 at 545 cm-1. The Raman spectrum of lemanskiite is different from that of lavendulan consistent with a different structure. Low wavenumber bands at 227 and 210 cm-1 may be assigned to CuCl TO/LO optic vibrations. Raman spectroscopy identified the substitution of arsenate by phosphate in zdenekite and lavendulan.
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2011 | 1 |
| 2007 | 1 |