1. kimberlite

noun. a rare type of peridotite that sometimes contains diamonds; found in South Africa and Siberia.

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Sentences with kimberlite

1. Adjective
These diamonds arrive at the surface during volcanic eruptions through "kimberlite" -- a sort of conveyor belt for diamond.

2. Noun, singular or mass
When the diamond travels to the surface too slowly, it turns into graphite; it must travel to the surface very quickly to remain in diamond form; the kimberlite travels between 10 and 30 kilometers per hour.

3. Verb, base form
Because the ratio of diamonds to kimberlite can be very low, harvesting usually is done on a large scale, and heavy machinery is necessary in the early part of the process.

4. Verb, non-3rd person singular present
Pipes of the minerals kimberlite and lamproite are often present in the Earth's upper mantle, and they carry diamond crystals in their pipe "trails."