I came across several studies that explain that calcite grows when the mentioned face is parallel to the substrate. Any ideas about this?
Interesting question. There are several paradoxes for calcite. First of all, it should be noted that the correct space group of calcite uses the rhombohedral (trigonal) Bravais structural lattice (SG R-3c: R), which is quite impractical and therefore hexagonal projection is commonly used. Crystallographic structural plane (10-14), resp. shortly (104) corresponds in morphological crystallography to the faces of the basic rhombohedron (10-11), (101). This is due, among other things, to significant differences in the lattice parameters a and c. This faces also correspond to the cleavage of calcite and the preferential orientation in XRD.
I do not know at all that calcite preferentially grows on the substrate by the surfaces of the rhomboedron (104) or (101). I don't even know about the literature about this. On geological, resp. mineralogical samples it is not visible at all and I've seen a lot of them. The growth of rhomboedral faces is somewhat preferred kinetically. The chemical composition of the mother liquor also has an effect.
hi
calcite crystal having 4 crystallography axes no 3 crystallography axes, and rhombohedry lattic is the better lattic among other in example cubic. ortorhombic, tetragonal and etc.
- Badges
- Science topic
- Similar topics
- Phytochemistry
- Extracts