Non-silicates constitute less than 10% of the Earth's crust. The most common non-silicates are the carbonates, the oxides, and the sulfides. There are also naturally occuring phosphates and salts. There are a few elements which occur in pure form, including gold, silver, copper, bismuth, arsenic, lead and tellurium.Carbon is found in both graphite and diamond form.he most common minerals are the silicates, as one would guess by looking at the abundances of the elements in the Earth's crust, but there is a great variety of minerals. Minerals are classified in many ways, including hardness, optical properties, crystal structure, etc.
Vas deferens: The tube that connects the testes with the urethra. The vas deferens is a coiled duct that conveys sperm from the epididymis to the ejaculatory duct and the urethra.
The vas deferens is in the scrotum and is part of a larger tissue bundle called the spermatic cord. The spermatic cord contains the vas deferens, blood vessels, nerves, and lymphatic channels. The pampiniform plexus is composed of the veins of the spermatic cord. These veins drain blood from the testes, epididymis, and vas deferens and eventually become the spermatic veins that drain into the main circulation of the kidneys.