Nano-Polycrystalline Diamond
A variety of Diamond
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Formula:
C
Nano-Polycrystalline Diamond (or NPD) is a completely transparent, polycrystalline synthetic consisting of randomly oriented, very tightly bonded nanoscale-sized diamond crystallites.
Using a sintering process, the material is created in a multi-anvil press at 15 gigapascals (2.18 million psi) and 2,300 to 2,500°C. High-purity graphite is thus converted directly into cubic diamond in a matter of minutes. The resulting NPD is composed of a mixture of 10-20 nm equigranular crystallites and 30-100 nm lamellar crystalline structures. It is harder and tougher than natural diamond and can be fashioned into a variety of shapes using lasers, even a perfect sphere - a shape which would be virtually impossible using single crystal diamond. (see G&G Summer 2012)
In 2015 it was reported that naturally occurring NPD was found at the Popigai impact crater in Russia.
Visit gemdat.org for gemological information about Nano-Polycrystalline Diamond.
Using a sintering process, the material is created in a multi-anvil press at 15 gigapascals (2.18 million psi) and 2,300 to 2,500°C. High-purity graphite is thus converted directly into cubic diamond in a matter of minutes. The resulting NPD is composed of a mixture of 10-20 nm equigranular crystallites and 30-100 nm lamellar crystalline structures. It is harder and tougher than natural diamond and can be fashioned into a variety of shapes using lasers, even a perfect sphere - a shape which would be virtually impossible using single crystal diamond. (see G&G Summer 2012)
In 2015 it was reported that naturally occurring NPD was found at the Popigai impact crater in Russia.
Visit gemdat.org for gemological information about Nano-Polycrystalline Diamond.Unique Identifiers
Mindat ID:
43276 (as Nano-Polycrystalline Diamond)
1282 (as Diamond)
1282 (as Diamond)
Long-form identifier:
mindat:1:1:43276:4 (as Nano-Polycrystalline Diamond)
mindat:1:1:1282:5 (as Diamond)
mindat:1:1:1282:5 (as Diamond)
Chemistry of Nano-Polycrystalline Diamond
Mindat Formula:
C
Element Weights:
| Element | % weight |
|---|---|
| C | 100.000 % |
Calculated from ideal end-member formula.
Elements listed:
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Nano-Polycrystalline Diamond
mindat.org URL:
https://www.mindat.org/min-43276.html
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Please feel free to link to this page.
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References for Nano-Polycrystalline Diamond
Localities for Nano-Polycrystalline Diamond
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia | |
| www.nature.com (n.d.) |
| Ohfuji et al. (2015) |