It can mine both Hellstone and Obsidian, unlike the Gold Pickaxe. However, it's incapable of mining Cobalt Ore, Mythril Ore and Adamantite Ore. The Nightmare Pickaxe is one of the first items that a player will obtain that is both melee and gives off particles.
September 19, 2011. A unit price is a currency value assigned to a single unit of measure. For example, a unit price can be applied to a mutual fund's basket of securities. A mutual fund's unit price is the price per fund share; each share represents a unit of ownership in the fund's basket of securities. A stock or share price represents a public company's market valuation per share; each share represents a unit of company ownership.
A unit rate is a ratio that has a denominator of 1. A unit rate is also called a unit ratio. (They mean the same thing.). $\frac{5}{4}$ and $3:8$ and $40\mbox{ to }10$ are ratios, but they are not unit ratios. $\frac{1.25}{1}$ and $0.375:1$ and $4\mbox{ to }1$ are unit ratios.