Amethyst Super Seven Q.B.(Rolled) 3-6cm

Amethyst Super Seven quality B is a rare mineral association composed of seven mineral species in a single matrix: Amethyst (SiO₂ with Fe⁴⁺), Hyaline Quartz (SiO₂), Smoky Quartz (SiO₂ with defects due to irradiation), Cacoxenite (Fe⁴³⁺(PO₄)₂₈(OH)₁₂·17H₂O), Rutile (TiO₂), Goethite (FeO·OH) and Lepidocrocite (FeO·OH, polymorph of goethite). It forms in pegmatites and hydrothermal veins under specific geochemical conditions that allow simultaneous or sequential precipitation of these seven species in a single quartz matrix. The characteristic color, with shades of purple, gold, brownish-red and orange distributed irregularly, results from the visual combination between the different minerals present. The mechanical rolling process progressively rounds the ends and corners of the pieces, resulting in a smoothed external profile that preserves the internal mineral composition. Hardness: 5 to 7 on the Mohs scale (composite). Density: 2.65 to 4.30 g/cm³ (variable depending on the proportion of minerals). Crystalline system: predominant trigonal. Available variations, approximate data: Size: 3 to 6 cm Unit weight: up to 0.100 kg (approx.) Average: 10 to 20 pieces per kg (approx.) I considered 0.100 kg in weight (you wrote 0.100g), compatible with 10 to 20 pieces per kg.