Defect and admixture composition of diamond crystals with growth pyramids <100> from placers of the Krasnovishersky district, the Urals

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Abstract

The internal structure of cuboid diamonds from contemporary alluvial placers of the Krasnovishersky district at the Urals was investigated with analyzing their spectroscopic characteristics. Crystals were divided into four groups by their anatomy and spectroscopic features: cuboids of the II variety in the Yu. L. Orlov classification; cuboids with transparent core and outer part saturated with inclusions; crystals with simultaneous growth of <100> and <111> pyramids, and crystals with their consecutive growth. The local photoluminescence investigations have been carried out for all different growth zones and pyramids. There was revealed localization of luminescence bands 926 and 933 nm to growth pyramids <100> and <111>. In all studied crystals, the last stage of growth was the regenerative formation of {111} face steps together with square pits forming on the surface. Some cuboids with C centres have specific luminescence systems, such as 575, 635.1, 636.8 nm, broad band with maximum at 700 nm, and intense lines at 800, 820.5, 840, 860, 869 nm. Different thermal history of mixed-habit diamonds was shown. It is noted that the cuboid diamonds from different regions of the world have the similar internal structure and spectroscopic features.

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About the authors

Igor V. Klepikov

A.P. Karpinsky Russian Geological Research Institute

Author for correspondence.
Email: Klepikov_Igor@mail.ru
SPIN-code: 2836-6724
Scopus Author ID: 57200302816

Phd student

Russian Federation, 199106, Saint-Petersburg, Sredniy prospect, 74 

Eugene A. Vasilev

Saint-Petersburg Mining University

Email: Simphy12@mail.ru

Leading engineer

Russian Federation, 2 21st line, Saint-Petersburg, 199106

Anton V. Antonov

A.P. Karpinsky Russian Geological Research Institute

Email: Anton_Antonov@vsegei.ru

Science worker, Isotopic research centre 

199106, Saint-Petersburg, Sredniy prospect, 74 

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Supplementary files

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2. Fig. 1. Cuboids of I group 600-66 (а—г) and 601-66 (д—з): а, д — general view of crystals; images of polished plates: б, е — photoluminescence under 365 nm excitation; в, ж — cathodoluminescence; г, з — transmitted light.

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3. Fig. 2. Image of the strongly dissolved chip of the I group crystal 126-76: a — general view; б, в — BSE image of the surface with rectengular pits; г, д, е — photoluminescence under 405 nm excitation; ж, з, и — cathodoluminescence (1 — cuboid zone, 2 — octahedral zone); г, ж — polished plate, other — nature surface.

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4. Fig. 3. Spectra of the diamond 126-76, recorded in different growth zones (1 — homogeneous cubic zone, 2 — octahedral zone): a — FTIR absorption; б — photoluminescence at 488 nm excitation; в — photoluminescence at 785 nm excitation, at 77 K.

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5. Fig. 4. Cuboids of the second group diamonds 685-66 and 602-66: a, e — general view. Images of plates: б, ж — transmitted light; в, з — сathodoluminescence; г, и — photoluminescence under 405 nm excitation; д, и — distribution of the N3 photoluminescence intensity under 405 nm excitation, through light filters of the edge 450 nm and blue SS4.

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6. Fig. 5. III group diamonds with simultaneous growth of pyramids <100> and <111>; general view: a — 123-76, б — 29-76, в — 615-66. Plates: г, д, е — cathodoluminescence; ж, з, и — photoluminescence under excitation 365 nm (и) and 405 nm (ж, з) through the edge light filter 450 nm. In frame — the fragment with spots of the locally decreased CL intensity, containing rosette-shaped inclusions in their centers.

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7. Fig. 6. FTIR absorption spectra of crystals with simultaneous growth of pyramids <100> and <111>: 1 — 123-76; 2 — 29-76; 3 — 615-66.

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8. Fig. 7. IV group crystals with the consequent change of their growth mechanism. General view: а — 122-76, г — 612-66. Plates: б, д — cathodoluminescence; в, е — photoluminescence under excitation 405 nm through the edge light filter 450 nm..

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