Diamonds are easily extracted from yellow ground, but fresh kimberlite rock, called blue ground, holds the diamonds and must be crushed in order to release them. The diamonds in the yellow ground can be washed into streams to eventually wind up in alluvial deposits.
Where are kimberlite diamonds found?
The deposits occurring at Kimberley, South Africa, were the first recognized and the source of the name. The Kimberley diamonds were originally found in weathered kimberlite, which was colored yellow by limonite, and so was called “yellow ground”.
How much is a kimberlite diamond worth?
Kimberlites form this region do yield beautiful diamonds which mostly range from very small to a maximum of 3 carats. Customers have found 1/4 carat to 1/2 carat blue diamonds and yellow & clear diamonds between 1/4 and 2 carats within our specimens worth $1,500-$4,000.
How do you identify a kimberlite diamond?
Finding large concentrations of G10 garnet can be a good indication of a diamondiferous kimberlite. On the Mohs hardness scale, garnet has a hardness of 8, compared with diamonds, which have a hardness of 10.
What type of soil are diamonds found in?
A grove of Pandanus candelabrum, which appears to grow only in diamond-bearing kimberlite soils. Diamonds are formed hundreds of kilometers below the surface, as carbon is squeezed under intense temperatures and pressures.
How do I find diamonds in my yard?
You can look through the alluvial deposits of sand and mud from old river and stream beds to pan for diamonds by using methods that include scanning the surface, sifting the soil, and then sifting the soil in water.
What does a diamond look like when it’s found?
Diamonds found at the Crater are typically smooth and well rounded. Their shape resembles a polished stone with smooth sides and rounded edges. Size: The average size of a diamond is about the size of a paper match head, approximately 20-25 points weight.
How do I identify my kimberlite?
kimberlite, also called blue ground, a dark-coloured, heavy, often altered and brecciated (fragmented), intrusive igneous rock that contains diamonds in its rock matrix. It has a porphyritic texture, with large, often rounded crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass).
Are kimberlites valuable?
Economic importance of Kimberlite
Kimberlites are the most important source of diamonds in the world. About 6,400 kimberlite pipes have been discovered in the world, of those about 900 have been classified as diamondiferous, and of those just over 30 have been economic enough to diamond mine.
How much is a kimberlite?
RAPAPORT… DiamondCorp recorded a sale of kimberlite diamonds from its Lace mine in South Africa for the first time since 1931, achieving an average price of $175 per carat.
Can kimberlite be found in?
Generally speaking, kimberlites are found only in cratons, the oldest surviving areas of continental crust, which form the nuclei of continental landmasses and have remained virtually unchanged since their formation eons ago.
What do diamonds look like before they are mined?
On the atomic level. When mined from the earth, diamonds look like cloudy rocks before they’re cut and polished. … Alternatively, carbon can form a repeating three-dimensional shape, a tetrahedron – and that’s your diamond.
How can you tell if a diamond is in the ground?
Here are some tips to help you spot a real diamond:
- They do not look like the ads. Diamonds sold in stores are already cut and polished. …
- Check for their natural shine. Diamonds are literally brilliant. …
- Diamonds are rounded not edged. …
- Check for translucency. …
- Check for toughness.
What rock is diamond found in?
Diamond is only formed at high pressures. It is found in kimberlite, an ultrabasic volcanic rock formed very deep in the Earth’s crust. The extreme pressures needed to form diamonds are only reached at depths greater than 150km.
How deep are diamonds in the ground?
Natural diamonds typically form 150–200 km below the surface of the earth. Diamond formation does not occur everywhere at these depths, but only below the oldest continents that have been stable for billions of years; these areas are known as cratons (see figure 2 in Summer 2018 Diamonds from the Deep).