So, if in laboratories scientists can dissolve basalts and other rocks and get secondary minerals, maybe in nature is it possible also?
I carried out a simple experiment using vinegar and limestone. Limestone is popular rock in nature and acetic acid is produced by bacteria fermentation. Limestone stone immersed in vinegar from my experiment is shown in the picture above (you can enlarge it clicking on the photo). After several days the stone was dissolved partially in vinegar and sediment appeared on the bottom. I pulled the stone out of the jar and added steel filings to the solution to increase the volume of the material. Filings were reacted with vinegar. A thick layer of sediment formed on the bottom, so I slipped a steel plate into it to have some artifact in the stone that I hoped to receive. I have put the jar on the window sill without a cap so that the liquid would evaporate freely. The suspension was dark, with time it became black and the Sun was heating it to high temperatures.
In a similar way, only on a larger scale, our ancestors could produce huge boulders right in the right place. Building pyramids and other ancient stone constructions could have been simpler than we suppose. Joseph Davidovits suggests that many stones of pyramids were made from concrete. The website davidovits.info describes it in this way:
"Some of the massive blocks making up the great pyramids of Giza in Egypt (pictured) are not limestone, but a synthetic mix like concrete, argue materials scientists. The paper by Michel Barsoum of Drexel University in Philadelphia, Pennsylvania, and his colleagues is the latest entry in a decades-long argument. Most Egyptologists reject the idea, put forth in the mid-1980s by French chemist Joseph Davidovits, that the pyramids contain concrete. Barsoum’s team took a fresh look at 15 samples using scanning- and transmission-electron microscopes. The samples contain ratios of elements, such as calcium and magnesium, that do not exist in nearby limestone. The imaging also revealed regions of amorphous structure. Both observations suggest that other substances were added to make a concrete mix, say the authors"
Ancient constructors could have big knowledge about dissolving rocks and creating secondary minerals and building monumental constructions was easy for them.