Epidote The following submission contains the data collection and processing for the sample epidote under the NanEd round-robin project. Precession Electron Diffraction (PED) was used to collect the dataset on the target crystal. The dataset was processed with PETS2 and eADT software. The table below summarizes the data collection parameters for the dataset. General information: Project NanED (www.naned.eu) ESR Project ESR8 & ESR9 - Round Robin Project Label RR1 Sample Label RR1-S1_PISA Data set Label RR_Cry4 Instrumental: Instrument FEI TECNAI F30 STWIN Radiation source FEG Accelerating voltage 300 kV Wavelength 0.0197 Å Probe Type Nanodiffraction Beam Diameter 200nm Beam Convergence Semi-parallel beam Detector US4000 - CCD camera GATAN (16-bit) (bottom mounted) Number of pixels in the image 2048 x 2048 Pixel size 15 µm x 15 µm Camera Length / Effective Camera Length 1000 mm / 1200 mm Calibration constant (not corrected for Effective Camera length) 0.00126 Å-1/pixel Hardware Binning 2 Sample description: Name Epidote Chemical composition Ca2FexAl3-xSi3O13H Sample source Natural source from Val d'Ossola, Italy Sample preparation Grinded in an Agatha mortar and suspended in 1ml of EtOH. 4 µL of the suspension were dropped with a pipette on the carbon side of a carbon-coated copper grid (300 mesh). Experimental: Data Type Electron diffraction data - 3D ED Data collection method Precession Temperature (K) used during data collection 293 K Number of crystals contributing to the data set 1 Number of experimental frames 141 tilt range, tilt step, tilt per frame -70° to +70°, 1°, 0° Precession angle 1° Exposure time per frame 2 s Software: Software used for the data collection Gatan Digital Micrograph software Software used for processing PETS2 and eADT Authorship and bibliography Author(s) of the data Laura Gemmrich Hernández (ESR8) & Marco Santucci (ESR9) Related data Publication(s) Files and data formats Image folder img: Folder containing images of the diffraction pattern from each frame. Image format tiff_16bit_unsigned