Chromian-manganoan augite in the interchondrule matrix of the Tieschitz (H3) chondritic meteorite

R. Hutchison
1987 Mineralogical magazine  
The Tieschitz chondrite is a disequilibrium assemblage of silicate, metal and sulphide occurring together or separately as chondrules and clasts that generally have opaque rims (matrix) of fine-grained material. Translucent, silicate-rich matrix fills channels that occur sporadically between chondrules and clasts. An angular fragment of twinned 'clinoenstatite' was found to be rimmed with chromium- and manganese-rich augite and surrounded by opaque matrix. The whole is set within the largest
more » ... a of translucent (white) interchondrule matrix encountered. It is suggested that reaction between crystallizing undersaturated translucent matrix, opaque matrix, and clinoenstatite probably led to the partial replacement of clinoenstatite by chromian-manganoan augite at high temperature.
doi:10.1180/minmag.1987.051.360.14 fatcat:4yg4llutpba55gzftbr4h5s5j4