Kataranskite with almandine garnet

Short description: This sphere made of amphibolite with kataranskite (violet) and almandine garnet (red-brown).
Kataranskite (or violet gabbro) is a tradename of metasomatic rock of lilac color.
Large plagioclase segregations in this grained rock are almost completely replaced by an aggregate of secondary minerals, mainly sericite, namely manganese containing fine-flaked muscovite (phengite), which is responsible for the purple or lilac color. Thus, this is a pseudomorphosis of phengite after plagioclase.
Base mineral: Kataranskite
Detailed Composition: Amphibolite, Kataranskite, Almandine, Plagioclase, Sericite, Muscovite, Phengite.
Locality: Klimovsky site, Chkalovsky pegmatite field, Chupinsky Bay, Loukhsky district, North Karelia
Diameter: 63 mm (2.49 inch)
Weight: 392 g (13,83 oz)