Search Mineralpedia – A Mineral Photo Database and Identification Guide

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Contains Li, Al, Mn2+ in the (M) octahedral sites with F>OH in the (A) position. Mindat places K & Rb in the Interlayer sites.

Rare worldwide with only in two in the USA, originally described from Japan. According to Bernard & Hyrsl, occurs in Na-Li rich pegmatites in Czech Republic, and Japan and is typically purple to pink.

Named for Paulo Anselmo Matioli of the J N Natural Science Museum in Brazil. Matioliite is a rare secondary hydrothermal mineral at the type locality in the Gentil mine granite pegmatite in Minas Gerais, Brazil. It is associated with fluorapatite, crandallite, and zoned gormanite-souzalite crystals. It forms as blue to colorless, transparent prismatic to tabular crystals. Additional localities include in Austria at Hochgosch Mountain, and the Gold Quarry mine in Nevada, USA.

Ref. Atencio, D. et al. and American Mineralogist November-December v. 91 no. 11-12 p. 1932-1936

Named to honor Margaret Mary Matula from Pennsylvania, USA who was the provider of some of the initial specimens. Matulaite is a rare mineral that can be found in the United States, Germany, Portugal, and France. It occurs as a secondary mineral in oxidized phosphatic iron deposits. Associated minerals include beraunite, rockbridgeite, dufrenite, cacoxenite, strengite, wavellite, goethite, and hematite.

 Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/matulaite.pdf