The origin of dolomite
How to distinguish between dolomite and calcite ?
Dear colleague,
Have a look here:
http://www.pitt.edu/~cejones/GeoImages/1Minerals/2SedimentaryMineralz/Calcite_Dolomite.html
Best, Thomas
Dear colleague,
you can look the chapter 8 of this book.
Best regards.
Tetiana
Limestone is generally used as way of reducing acidity where soil pH is too low. The dolomitic limestone should be favored when Magnesium is deficient in the soil less than 100 in the soil test. Otherwise the calcitic lime is favored based on its softer nature conferring more solubility and lower cost. In terms of Calcium defiency do not worry if Calcium value is over 1000. Availability of lime is based mostly on its fineness of grind. Care needs to taken not to overlime as micronutrient deficiencies with result. Limestone is found in just about all nations in large quantities but the processing is not necessarily available everywhere. Soil acidity is a major constraint in about one third of the world's soil and is problematic when ammoniated fertilizers are used without appropriate liming to remediate the acidity the fertilizer causes. If you wondering about soil pH take 100 g of soil and add 200 to 300 ml of water and stir for a minute. Let the soil settle and use a pH meter or litmus paper to determine the acidity value. Most crops are optimized at pH 6 to pH 7.2 above that range micronutrients can be unavailable and below that range problems of toxicity and mineral deficiencies are likely. Tissue analysis can complement the soil analysis to achieve optimized crop and plant nutrition.
Thank you dear colleagues.
dear Kenneth M Towe:I know there are very many papers and books on carbonate minerals problem, but until today the origin of dolomite remains delicate. I mean the difference under athe polarizing microscope without using the coloring methods.
cordially
it is so difficult to differentiate between calcite and dolomite using optical microscope especially in microcrystalline ones.
except in the planner dolomite boundary ( e- and s- planner) the dolomite prefers the rhombohedral form. Though, this method has exceptions when the calcite give the rhombic form (the accuracy up to 90%).
other wise, use the stanning method or chemical and XRD analyses.
Dear Sigrid
Thank you very much for answer,
Yes I know it.
I have a problem in the interpretation of thin sections and their environments of deposits
as well as the chronology of the phenomenon of dolomitization and de-dolomitization.
You will find attached an example of microfacies.
Kind regards
Youcef
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