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Locality: Coranda-Hondol, Romania
Size: 5 cm x 4 cm x 1.5 cm
Formula: CaSO4 · 2H2O
Description: Swallow-tail twinning is a type of crystal twinning in which one crystal divides into two along a twin plane, giving a twinned crystal in the shape of a “V” or swallow-tail. The mineral Gypsum may develop this twinned form (https://skfb.ly/6WY6V). Gypsum is one of the most common sulfate mineral.
Concept & 3D-modelling by dr. Andrei Ionut APOPEI