Antigorite mineral. Antigorite is a variety of the serpentine group of minerals, which are hydrous magnesium iron phyllosilicates. Antigorite occurs in dark to light green colours, with a hardness of 3.5?ａ¨4 and a very greasy lustre. The sample seen here is a rare variety of antigorite called bowenite with hardness up to 5.5. With its veil-like appearance and silky, apple green colour it is popular for use in jewellery. Specimen found in Moravicza, Hungary.