Exsolution of Dolomite from Calcite

摘要: Calcites from a variety of marbles have been investigated by single-crystal X-ray techniques. Most the specimens were relatively high-grade metamorphic carbonates, amphibolite and granulite facies rocks. The typically clouded calcite these rocks commonly contains dolomite, revealed photographs but not always observed under microscope. This finely disseminated dolomite is in same crystallographic orientation as host almost certainly an exsolution product. An oriented intergrowth was produced laboratory. original material echinoid test made up spongy with approximately 10 per cent $MgCO_3$ metastable solid solution. amount Mg stable only at temperatures well above 600° C; therefore some took place when sample heated $CO_2$ pressure 500° C. magnesian retained its identity single crystal, an...