Mineralpedia Details for Bementite
Named for American mineral collector Clarence Sweet Bement. It is an uncommon but widespread mineral that occurs in the United States, England, Sweden, Russia, Japan, and South Africa among several others. Bementite can be found in layers parallel to veins of calcite and intergrown with other manganese minerals. Associated minerals include calcite, willemite, hausmanntie, jacobsite, braunite, alleghanyite, baryte, grossular, johannsenite, rhodochrosite, and inesite.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/bementite.pdf
Bementite from Gambatesa mine, Reppia, Graveglia Valley, Genova prov., Liguria, Italy
Light pink, thin platy crystals to 0.5mm in open vugs and composing the matrix.