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.
Mineral Hardness. The hardness of a mineral is a way of describing how easy or difficult it is to scratch the mineral. It is used, in combination with the other physical properties, to help identify a mineral specimen. In mineral books, hardness is shown using the letter âH.â An example of this is âTalc, H1â. Mineralogists realized that a way to measure the hardness of minerals was needed. In 1824, a mineralogist from Austria named Friederich Mohs chose 10 common minerals and arranged them in order from softest to hardest. This is called the Mohs Scale of Hardness and today is used by mineralogists all over the world. The Mohs Scale of Hardness: 1. Talc . 2.