In this example of the specific gravity test, we use gold mixed with quartz. Nugget weighed in air weighs 96 grams. Nugget suspended in water weighs 74.5 grams 96 74.5 = 23.5 96 divided by 23.5 = 4.17 4.17 2.63 = 1.54
The simplest way to test specific gravity is weigh the quartz gold specimen in air and multiply the weight by 1.9. Then weigh the quartz gold specimen fully submerged in distilled water and multiply that weight by 3.1. Minus the wet figure from the dry figure and you will get a fairly accurate specific gravity for that specimen!!
Step 7. Match your calculation with the specific gravity to find out the metal purity in the chart below. Once you determine the specific gravity, it is important to note that tungsten gold bars are almost the same specific gravity as 24k gold bars. Tungstens specific gravity is 19.25 and 24k gold is 19.32.
A Specific Gravity Test is used to calculate the amount of gold contained in a gold nugget that contains a mixture of gold and quartz. You need two pieces of information to do the calculation. You need the weight of the specimen in air and you need the weight of the specimen when it is suspended in water.
The default values below are for gold, using an average specific gravity of 18.6, and quartz, using a specific gravity of 2.65. These values assume a specimen of gold in a matrix such as quartz. However for a gold nugget, containing another mineral such as silver, use the specific gravity of pure gold, 19.3, and pure silver, 10.5.