Abstract
The milky appearance shown by certain type IaB diamonds has been subjected to several recent studies, but the origin of this feature is not fully understood. Here several type IaB diamonds with a milky appearance have been studied by cathodoluminescence (CL), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). CL of several hazy type IaB diamonds shows scattered or orientated micro-sized spots or short linear luminescence features. TEM observation revealed that those spots and linear features are caused by dislocation loops that are likely responsible for the hazy appearance of the host diamonds. It is also shown that type IaB diamonds with a cloudy appearance contain nano-sized inclusions with negative crystals of octahedral shape. Some of these negative crystals contain a precipitate that can be explained by a compressed disordered cubic δ-N2 phase observed by high-resolution TEM. In one of the milky IaB diamonds with platelet defects, polycrystalline areas composed of columnar diamond crystals elongated radially in [110], similar to ballas diamond, were revealed by EBSD. Taking into account these observations, it is suggested that the dislocation loops, nano-sized inclusions (negative crystals) and/or characteristic grain boundaries of the radiating fibrous crystals would be the origins for the milky appearance of the type IaB diamonds studied here. Those results add a complementary explanation that accounts for the milkiness of type IaB diamonds studied before.
Acknowledgments and Funding
We thank Naomi Uchiyama and Kim Kisslinger for assistance with FIB; Lihua Zhang for technical support with TEM; Tetsuo Irifune for the support of the PRIUS project; Stuart Overlin for editing; Jae Liao for photographing; Adrian Chan for sample polishing; and Ulrika D’Haenens-Johansson, Karen Smit, Evan M. Smith, Christopher M. Breeding, Sally Eaton-Magaña, Paul Johnson, and Kyaw Moe for valuable discussions and suggestions. This research used resources of the Center for Functional Nanomaterials, which is a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704.
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Articles in the same Issue
- Uptake and release of arsenic and antimony in alunite-jarosite and beudantite group minerals
- Trends in the discovery of new minerals over the last century
- Origin of milky optical features in type IaB diamonds: Dislocations, nano-inclusions, and polycrystalline diamond
- Zeolite-group minerals in phonolite-hosted deposits of the Kaiserstuhl Volcanic Complex, Germany
- Melting curve minimum of barium carbonate BaCO3 near 5 GPa
- The effect of coordination changes on the bulk moduli of amorphous silicates: The SiO2-TiO2 system as a test case
- Energetics of ethanol and carbon dioxide adsorption on anatase, rutile, and γ-alumina nanoparticles
- The effect of oxidation on the mineralogy and magnetic properties of olivine
- Phase, morphology, elemental composition, and formation mechanisms of biogenic and abiogenic Fe-Cu-sulfide nanoparticles: A comparative study on their occurrences under anoxic conditions
- Static compression of B2 KCl to 230 GPa and its P-V-T equation of state
- Geochemical characteristics of lawsonite blueschists in tectonic mélange from the Tavşanlı Zone, Turkey: Potential constraints on the origin of Mediterranean potassium-rich magmatism
- Origin of vesuvianite-garnet veins in calc-silicate rocks from part of the Chotanagpur Granite Gneiss Complex, East Indian Shield: The quantitative P-T-XCO2 topology in parts of the system CaO-MgO-Al2O3-SiO2-H2O-CO2 (+Fe2O3, F)
- A new occurrence of yimengite-hawthorneite and crichtonite-group minerals in an orthopyroxenite from kimberlite: Implications for mantle metasomatism
- Discovery of asimowite, the Fe-analog of wadsleyite, in shock-melted silicate droplets of the Suizhou L6 and the Quebrada Chimborazo 001 CB3.0 chondrites
- New Mineral Names
Articles in the same Issue
- Uptake and release of arsenic and antimony in alunite-jarosite and beudantite group minerals
- Trends in the discovery of new minerals over the last century
- Origin of milky optical features in type IaB diamonds: Dislocations, nano-inclusions, and polycrystalline diamond
- Zeolite-group minerals in phonolite-hosted deposits of the Kaiserstuhl Volcanic Complex, Germany
- Melting curve minimum of barium carbonate BaCO3 near 5 GPa
- The effect of coordination changes on the bulk moduli of amorphous silicates: The SiO2-TiO2 system as a test case
- Energetics of ethanol and carbon dioxide adsorption on anatase, rutile, and γ-alumina nanoparticles
- The effect of oxidation on the mineralogy and magnetic properties of olivine
- Phase, morphology, elemental composition, and formation mechanisms of biogenic and abiogenic Fe-Cu-sulfide nanoparticles: A comparative study on their occurrences under anoxic conditions
- Static compression of B2 KCl to 230 GPa and its P-V-T equation of state
- Geochemical characteristics of lawsonite blueschists in tectonic mélange from the Tavşanlı Zone, Turkey: Potential constraints on the origin of Mediterranean potassium-rich magmatism
- Origin of vesuvianite-garnet veins in calc-silicate rocks from part of the Chotanagpur Granite Gneiss Complex, East Indian Shield: The quantitative P-T-XCO2 topology in parts of the system CaO-MgO-Al2O3-SiO2-H2O-CO2 (+Fe2O3, F)
- A new occurrence of yimengite-hawthorneite and crichtonite-group minerals in an orthopyroxenite from kimberlite: Implications for mantle metasomatism
- Discovery of asimowite, the Fe-analog of wadsleyite, in shock-melted silicate droplets of the Suizhou L6 and the Quebrada Chimborazo 001 CB3.0 chondrites
- New Mineral Names