1975/06/01 by G. Cliff, J. A. Gard, G. W. Lorimer +1 · 2 citations
Earth and Planetary Sciences · Environmental Science · Engineering · Chemistry · #Mineralogy and Gemology Studies #Chemical Synthesis and Characterization #Metal Extraction and Bioleaching #Tobermorite #Crystallography #Monoclinic crystal system #Diffraction #Electron microscope #Electron diffraction #Materials science #Shrinkage #Chemistry #Optics #Crystal structure #Physics #Composite material
paper · doi:10.1180/minmag.1975.040.310.01
openalex publication_date 1975/06/01 · openalex created_date 2022/05/12 · openalex updated_date 2026/06/11
Summary Tacharanite has been re-examined using electron microscopy and diffraction, analytical microscopy, X-ray powder and fibre rotation photographs, and other methods. The composition approximates to Ca 12 Al 2 Si 18 O 69 H 36 , and the X-ray diffraction patterns can be referred to an A- centred monoclinic pseudo-cell with a 17·07, b 3·65, c 27·9 Å, β 114·1°, Z = 1. In the true cell b is certainly, and a and c probably, doubled. Small, reversible changes in pseudo-cell parameters occur on heating below 200°C, and parameters found by electron diffraction differ slightly from those found with X-rays, presumably due to shrinkage on dehydration in the high vacuum of the electron microscope. An earlier report that tacharanite changes into a mixture of tobermorite and gyrolite on standing in air is not confirmed. Tacharanite shows some important resemblances to tobermorite, but there are also significant differences.