Abramelin, on 19 December 2012 - 02:35 PM, said:
I assume many here will be acquainted with the work and theories of Joseph Davidovits, which are quite disputed, btw.
But instead of - like he did - suggesting that complete stones were shaped from some sort of cement, I think it's possible stones were split, moved, and that before they were put into place the sides of the stones were chemically altered using organic acids extracted from plants, more or less as was suggested by Fawcett, Bingham and others.
Fabrication of stone objects, by geopolymeric synthesis, in the pre-incan Huanka civilization (Peru)
Joseph DAVIDOVITS and Francisco ALIAGA
http://www.geopolyme...-plant-extracts
http://www.geopolyme...df/CemPlant.pdf
The starting stone material (silicate or silico-aluminate) is dissolved by the organic extracts,
and the viscous slurry is then poured into a mould where it hardens. This technique, when
mastered, allows a sort of cement to be made by dissolving rocks; statues which could have been
made by the technique of the pre-incan HUANKA, by dissolution followed by geopolymeric
agglomeration, are found to contain Ca-oxalate in the stone.
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We present here the first results on plant extracts on the dissolution or dis-aggregation of
calcium carbonate containing rocks (Bio-tooling action). The feasibility of chemically working
calcium carbonate with various carboxylic acids found in plants (acetic, oxalic and citric acid)
has been studied. Maximum bio-tooling action is obtained with a solution containing:
Vinegar (1 M) (acetic acid)
Oxalic acid (0.9 M)
Citric acid (0.78 M)
The great surprise was actually to discover very ancient references to their use since Neolithic
times for working materials which are very hard but easily attacked by acids, such as chalk.
Thus, a bas-relief from the tomb of Mera, at SAQQARAH (VI dynasty, 3Millenium B.C., Egypt)
shows the hollowing out of "Egyptian alabaster" (CaCO3) vases by a liquid contained in a water
skin or bladder. An experiment of interest was to compare the "bio-tooling" technique with the
shaping of a hole using a steel tool and the quartz sand technique recommended by prehistorians.
The hole resulting from sand abrasion has rough walls, whereas bio-tooling gives a
smooth finish.
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The precolumbian farmers were quite capable of producing large quantities of acids from such common plants in their region as:
fruits, potatoes, maize, rhubarb, rumex, agave americana, opuntia, ficus indica, oxalis pubescens
The only problem I have with the chemical theory is the fact that the artefacts displaying vitrification are very widespread across Peru and Bolivia. The shear size and number of blocks concerned and also where carvings have been made in tunnels, rock outcrops, and even mountain sides, the shear volume of chemical needed would be enormous.
Then the question has to be asked why have we not rediscovered this secret cocktail? It's one thing to produce a list of acid bearing chemicals and foods it's quite another to verify that they are capable of eating hard rock to allow it to be worked like butter.
Didn't the above write up mention calcium carbonate rocks? Isn't that chalk? How would these cocktails work on diorite, andesite, and granite?
I think if it is part of the story it's only a very small part. To think that pouring some fruit juice on some diorite is going to allow it to be worked to precision fits is stretching the imagination just a little to far imho.
Don't forget that the above description mentions steel tools so that immediately relegates the theory to a non-credible explanation.
Then consider where I live herein Jersey. We see a lot of churches, walls and residential houses built out of local red granite and in the neighbouring island of Guernsey it's grey in colour.
A lot of time and effort obviously goes into cutting this material suitable to form building blocks. If it was a straightforward as applying a chemical cocktail to avoid expensive diamond cutting equipment do you really think someone would have rediscovered the technique by now?
I think a dose of solid reason is called for here.
Plus the analysis looked at earlier was very detailed, and categorically implicating intense heat as the main force responsible for the vitrification. The truth is we just don't know how they did this and I would want to avoid attempts to wrap it up with some partial or improbable theory. I know it's tempting to do this but I think it should be resisted.
Edited by zoser, 19 December 2012 - 03:15 PM.