Formula: CaMn²⁺(Si₂O₆)

Species:

Colour: Pale to medium pink; brownish red; colourless to yellowish pink in transmitted light

Lustre: Sub-Vitreous, Resinous, Waxy

Hardness: 5½ – 6½

Specific Gravity: 3.32 – 3.43

Crystal System: Triclinic

Member of: Wollastonite Group

Name: Name re-used in 1922 by Esper Signius Larsen, Jr. and Earl Victor Shannon for a new mineral somewhat chemically similar to the original material, but which had proved to be a mixture. The original bustamite from Real de Minas, Fetela (Tetela de Ocampo), Jonotla, Mexico was a mixture of rhodonite and johannsenite. Originally named in 1826 by Alexandre Brongniart in honor of Anastasio Bustamente y Oseguera [1780, 1853], a medical doctor, revolutionary, general, and three time president of Mexico.

Type Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey – USA

Isostructural with: Ferrobustamite, Serandite, Vistepite, Wollastonite.The Mn analogue of ferrobustamite.