reÂ·ticÂ·uÂ·late. adj. 1. Resembling or forming a net or network: reticulate veins of a leaf. 2. Relating to or being an evolutionary process that involves the exchange of genes between organisms of different species, as in the formation of a new species through hybridization.
Egypt is rich in building and decorative stone, copper and lead ores, gold, and semiprecious stones. These natural resources allowed the ancient Egyptians to build monuments, sculpt statues, make tools, and fashion jewelry. Embalmers used salts from the Wadi Natrun for mummification, which also provided the gypsum needed to make plaster.
Mohs scale of mineral hardness. The mohs scale, named after Friedrich Mohs. Mohs scale of mineral hardness is named after the scientist, Friedrich Mohs, who invented a scale of hardness based on the ability of one mineral to scratch another. Rocks are made up of one or more minerals. According to the scale, Talc is the softest: it can be scratched by all other materials. Gypsum is harder: it can scratch talc but not calcite, which is even harder. The hardness of a mineral is mainly controlled by the strength of the bonding between the atoms and partly by the size of the atoms. It is a measure of the resistance of the mineral to scratching. The Mohs scale is for natural minerals. For manufactured products other measures of hardness are better.