The Seven Kinds of Gold and the Good Gold of Havilah

"And the gold of that land is good" (Genesis 2:12). The verse stating that this gold is good implies that there is also gold that is not good. Rav Chisda said: There are seven kinds of gold: gold, good gold, gold of Ophir, gold of mufaz, beaten gold, closed gold, and gold of parim [bullocks]. Plain gold and good gold, as it is written, "And the gold of that land is good." Gold of Ophir, which comes from Ophir. Gold of mufaz, which resembles pure topaz. Beaten gold, which is spun out fine like a thread. Closed gold [sagur], for when its shop opens, all the other shops close [its value is so great that no one buys ordinary gold]. Gold of bullocks [parim], which resembles the blood of bullocks. Rav said: There were five kinds, and each and every one of them contains both gold and good gold.