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$20.00
800 grams is about one and three quarters of a pound. This is true for obsidian or for anything else that you are weighing.
599 dollars
How much black vampire katanas are worth depends on the age and the condition. Some are worth upwards of 1,000 dollars.
Low quality or common obsidian can be purchased wholesale for as little as 50 cents a pound. Retail costs are slightly higher and the price can rise considerably when purchasing rare colors such as red, green and blue. Also, large pieces are worth more, and price is also affected by the amount of impurities found in the piece. A football piece of good quality obsidian can sell for around $75.00.
The black is worth 7.
It can be use for jewellery and stone age arrowheads, as the obsidian was much sharper when made into a specific shape. It can be sharpened to a very thin thickness. It is very shiny and is black. This is why Obsidian is common to be used in jewellery. Obsidian is igneous rock, which means that it was formed either inside (intrusive) or outside (extrusive) of the volcano. Igneous rocks are basically cooled lava, or magma.
50$
9k
220 Dollars
100-10000 USD
It is worth about $13, if it were a rookie sensations card it would be worth about $250.