Calcite on Quartz / Amethyst with Celadonite

Item Description

A beautiful showy display specimen host a "star"-shaped group comprising translucent, off-white scalenohedral Calcite crystals, with individual crystals measuring up to 3.2 cm, sitting atop a flowing group of translucent Quartz which ranges from colorless to a light Amethyst hue, accenting by "dustings" of strong blue-green colored Celadonite, and some tiny spherical / radiating aggregates of an unknown greenish-black mineral (possibly something like Julgoldite {?}, but it hasn't been reported from Iraí). No damage I can find, and the piece looks beautiful when backlit.
From the collection of the recently deceased Alvaro Lucio, arguably the most well-known and accomplished mineral dealer and collector in Brazil. Alvaro graduated with a degree in civil engineering, mining and metallurgy from the Escola de Minas de Ouro Preto in 1949. He began his PhD in the United States and completed it at the Federal University of Minas Gerais. He worked as a professor of extractive metallurgy at UFMG, and also as a technical consultant for several companies in the sector. He was the author of several works, published in books and magazines around the world. He received several honors for his contribution to the development of metallurgy and the introduction of metallurgical physical chemistry in Brazil. His knowledge, solicitousness and enthusiasm will be greatly missed in the mineral world.