Mineralpedia Details for Matulaite
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
Matulaite from Bachman mine, Northampton Co., Pennsylvania, United States
White, pearly, spheroidal crystals, which in cross-section are shown as thin platy crystals in fan-like, full and partial radial patterns to about 0.75mm across. Often single plates give sericitic-like reflections.
Tiny, less than 0.3mm, pearly white, equant micro crystals.
Matulaite from Foote mine, Cleveland Co., North Carolina, United States
Dull white spherical Matulaite crystals to about 0.3mm on and with yellow Jahnsite blades. Also associated are very tiny, thin yellow Laueite crystals in an 1.3 x 5mm vug. A rare mineral which occurs in both pegmatitic and non-pegmatitic environments like many other Ca-Al phosphates.