When calcites are growing in the seawater partition coefficient is different for different elements for one specific mineral. I want to know the difference between one particular calcite in different Miller indices.
Thank you
The accommodation of trace elements which are of no effect on the lattice of the carbonate minerals will not provoke a different crystal morphology. We studied freshwater limestones in which the calcite graoi morphology changed as a function of the physical-chemical regime mainly pH and T and the Ca, Mn, Mg..contents together with the mineral asseblage.
Stage 1
calcite: stubby crystals with the hexagonal prism {101¯0}, trigonal bipyramids {011¯1}
Stage 2
calcite: isometric, rhombohedral crystals {011¯1}
dolomite: rhombohedron {101¯1}{12¯10}
barite: tabular crystals elongated along the [001] axis with faces {001}
calcite, baryte, gypsum (“Mary’s Glass”), aragonite, dolomite, kutnahorite
Stage 3
calcite: flat rhombohedral crystals {011¯2}
calcite, mejonite (?), anatase, halite, sylvite, kainite, thaumasite
Stage 4
calcite: pointed rhombohedral crystals {022¯1}
barite: rod-shaped crystals {001}, {011}, {101}
calcite, kutnahorite, baryte (strontian baryte)
Stage 5
calcite: not easy to identified (probable pointed rhombohedral crystals {022¯1} ?)
calcite, “manganomelane”
You should consider the entire mineral association not only calcite.
DILL, H.G., TECHMER, A., BOTZ, R. and WEBER, B. (2012) Chemical and mineralogical variations at the transition from subaqueous to subaerial rift-related freshwater limestones long the Dead-Sea-Transform Fault, NW Jordan.- Zeitschrift der deutschen Gesellschaft für Geowissenschaften, 163: 91-112.
HGD
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