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).
What are kimberlite indicators?
The most important indicator minerals for kimberlite exploration are pyrope, chromite, Mg-rich ilmenite (i.e., picroilmenite), Cr-diopside, and Mg-olivine (i.e., forsterite).
Do diamonds come from kimberlite explosions?
No, diamonds have to come from the Earth’s mantle, hundreds of kilometers beneath our feet. Kimberlites are volcanic eruptions that bring material from the depths where diamonds can form. Yet, unlike many geologic processes, a kimberlite eruption could launch rocks from the mantle at over 250 kilometers an hour!
What is the value of kimberlite?
Modeled prices ranged between US$129 and US$355 per ct for the diamond populations of the major kimberlite units making up the Star and Orion South kimberlites.
What does a diamond look like when it’s found?
Diamonds found at the Crater are typically smooth and well rounded. Their shape resembles a polished stone with smooth sides and rounded edges. Size: The average size of a diamond is about the size of a paper match head, approximately 20-25 points weight.
Where is kimberlite found in Australia?
South Australia
Most of the known kimberlites in South Australia are located in the Adelaide Fold Belt (Colchester, 1972;Ferguson and Sheraton, 1979;Stracke et al., 1979;Scott Smith et al., 1984), where they occur as a semi- continuous, northwest trending dyke-swarm ( Fig. 1).
How deep are kimberlite pipes?
between 150 and 450 kilometers
The general consensus is that kimberlites are formed deep within the mantle, at depths between 150 and 450 kilometers, from anomalously enriched exotic mantle compositions. They are erupted rapidly and violently, often with the release of considerable amounts of carbon dioxide (CO2) and volatile components.
Why are diamonds found in kimberlite pipes?
Diamond-bearing kimberlite pipes are only found in ancient areas of the continents. But diamonds have also been found far from the pipes. This is because volcanic rock erodes and is washed away over time. Rivers, streams and glaciers can carry diamonds far from the original volcanoes.
How much is kimberlite worth per gram?
Kimberlite has over 150 minerals and is very rare fetching prices of 50$ per gram.
Where can I find kimberlite in the US?
They occur in the western margin of the Appalachians from New York to Tennessee; in the central region of the U.S. including Kentucky, southern Illinois, Missouri, Kansas and Arkansas, and in the Western States of Montana, Colorado, Wyoming and the Colorado Plateau.
What happens if you find a diamond in your backyard?
If you ever find a diamond ring, or any lost property, don’t assume that you can keep it. Always attempt to find the owner if possible, or turn the item in to the police. Most states will allow finders to keep the property if the owner does not show up to claim it after a certain time.
What is kimberlite and where is it found?
Kimberlite is typically found in pipes – structures with vertical edges that are roughly circular in cross-section. The rock may have been injected into the areas of weakness in the mantle.
How much does a kimberlite stone cost?
Just look at the sale prices for some of these high-quality stones bottom left set 4.6 million center $10.4 million $12.36 million all for individuals stones very, very profitable. What have you learnt on diamonds and kimberlites: Firstly all diamonds originate in kimberlite pipes or dykes including those in placid deposits.
Are there kimberlites in Botswana?
The picture in this slide in the top right is a satellite image of the featured Kalahari desert in Southern Botswana roughly circular features are shallow sulk pans unrelated to kimberlites.
What is the surface morphology of an unweathered kimberlite?
The surface morphology of an unweathered kimberlite is characterised by a crater, up to 2 kilometers in diameter, whose floor may be several hundred meters below ground level. The crater is generally deepest in the middle.