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1-20 OF 35 RESULTS FOR
framesite
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Journal Article
Strange Diamonds: The Mysterious Origins of Carbonado and Framesite
Journal: Elements
Publisher: Mineralogical Society of America
Published: 01 March 2005
Elements (2005) 1 (2): 85–89.
...Peter J. Heaney; Edward P. Vicenzi; Subarnarekha De Abstract Polycrystalline aggregates of diamond called carbonado and framesite have excited the attention of scientists because their crystallization histories are thought to depart markedly from established modes of diamond genesis. In contrast...
Image
Carbon isotopic signatures for framesite diamonds from Orapa ( Deines et al...
in THE ORIGIN OF LARGE IRREGULAR GEM-QUALITY TYPE II DIAMONDS AND THE RARITY OF BLUE TYPE IIB VARIETIES
> South African Journal of Geology
Published: 01 December 2014
Figure 4 Carbon isotopic signatures for framesite diamonds from Orapa ( Deines et al, 1993 ), Venetia ( Jacob et al., 2000 ) and an unknown South African locality ( Dubosi and Kurat, 2010 ). The Orapa framesites are inclusion free, but the two other populations have websteritic inclusions.
Image
COMPARISON OF CARBONADO, FRAMESITE, AND ECLOGITIC SINGLE-CRYSTAL DIAMOND.
Published: 01 March 2005
TABLE 1 COMPARISON OF CARBONADO, FRAMESITE, AND ECLOGITIC SINGLE-CRYSTAL DIAMOND.
Image
Compilation of published δ 13 C values for ( A ) carbonado (avocado - Brazi...
Published: 01 March 2005
FIGURE 1 Compilation of published δ 13 C values for ( A ) carbonado (avocado - Brazil; burgundy - Central African Republic); ( B ) framesite; and ( C ) monocrystalline diamonds (blue - harzburgitic; red - eclogitic). Insets: ( A ) carbonado specimen from Mambere River, Haute-Sangha Province
Journal Article
THE ORIGIN OF LARGE IRREGULAR GEM-QUALITY TYPE II DIAMONDS AND THE RARITY OF BLUE TYPE IIB VARIETIES
Journal: South African Journal of Geology
Publisher: Geological Society of South Africa
Published: 01 December 2014
South African Journal of Geology (2014) 117 (2): 219–236.
...Figure 4 Carbon isotopic signatures for framesite diamonds from Orapa ( Deines et al, 1993 ), Venetia ( Jacob et al., 2000 ) and an unknown South African locality ( Dubosi and Kurat, 2010 ). The Orapa framesites are inclusion free, but the two other populations have websteritic inclusions. ...
Journal Article
Evidence for multiple diamondite-forming events in the mantle
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 August 2014
American Mineralogist (2014) 99 (8-9): 1537–1543.
...Sami Mikhail; Daniel Howell; Francis M. McCubbin Abstract A collection of 35 diamondite samples (polycrystalline diamond aggregates, sometimes referred to as framesites), assumed to be from southern Africa, have been studied to investigate their infrared (IR) spectroscopic characteristics. Due...
Image
Carbon isotopic signatures for diamond suites from the Orapa (AK-1) kimberl...
in THE ORIGIN OF LARGE IRREGULAR GEM-QUALITY TYPE II DIAMONDS AND THE RARITY OF BLUE TYPE IIB VARIETIES
> South African Journal of Geology
Published: 01 December 2014
for the websteritic diamonds. Note the strong overlap between the field for Orapa websteritic diamonds and framesites.
Journal Article
Type II diamonds: Flamboyant Megacrysts?
Journal: South African Journal of Geology
Publisher: Geological Society of South Africa
Published: 01 March 2009
South African Journal of Geology (2009) 112 (1): 23–38.
... and carbon isotopic signatures. Diamonds with complex growth zones and deformation textures can be explained in terms of dynamic mantle processes, linked to formation of the sheared peridotites, within the thermal aureole surrounding the kimberlite magma in which the megacryst suite crystallised. Framesites...
Image
a. Carbon isotopic compositions of carbonado samples documented by Shelkov...
in INTRAGRAIN VARIATION IN δ 13 C AND NITROGEN CONCENTRATION ASSOCIATED WITH TEXTURAL HETEROGENEITIES OF CARBONADO
> The Canadian Mineralogist
Published: 01 October 2008
, 1998) and Corte et al . (1998) are plotted. Nitrogen concentrations in carbonado are higher than in impact-generated diamond, and lower than in cubic and metamorphic diamond. “Framesites” have similar nitrogen concentration to carbonado.
Journal Article
Diamonds
Journal: Elements
Publisher: Mineralogical Society of America
Published: 01 March 2005
Elements (2005) 1 (2): 67–70.
... polycrystalline diamond—carbonado and framesite—and, second, microdiamonds discovered over the last 20 years associated with metamorphic rocks. Heaney, Vicenzi, and De review the characteristics of carbonado and framesite and help unravel some of the mystery around these enigmatic materials. As a high-pressure...
Journal Article
Eskolaite associated with diamond from the Udachnaya kimberlite pipe, Yakutia, Russia
Alla M. Logvinova, Richard Wirth, Nikolai V. Sobolev, Yuri V. Seryotkin, Emiliya S. Yefimova, Christine Floss, Lawrence A. Taylor
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 April 2008
American Mineralogist (2008) 93 (4): 685–690.
... aggregates (framesites). Thus, the picrochromite is a signature indicative of its U/P-type (ultramafic) diamond environment. The only other reported occurrence of eskolaite to date is from the Zagadochnaya kimberlite in Yakutia, where it coexists with a set of eclogitic (E-type) Cr-enriched minerals...
Journal Article
Microstructural study of synthetic sintered diamond and comparison with carbonado, a natural polycrystalline diamond
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 February 2004
American Mineralogist (2004) 89 (2-3): 438–445.
..., irregularly shaped, polycrystalline aggregates with grain sizes ranging from less than 1 to several hundred μm ( Dismukes et al. 1988 ; Jeynes 1978 ; Trueb and de Wys 1971 ). Unlike non-porous microcrystalline diamond aggregates found in kimberlites (e.g., stewartite and framesite), carbonado is recovered...
Journal Article
INTRAGRAIN VARIATION IN δ 13 C AND NITROGEN CONCENTRATION ASSOCIATED WITH TEXTURAL HETEROGENEITIES OF CARBONADO
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 October 2008
The Canadian Mineralogist (2008) 46 (5): 1283–1296.
... , 1998) and Corte et al . (1998) are plotted. Nitrogen concentrations in carbonado are higher than in impact-generated diamond, and lower than in cubic and metamorphic diamond. “Framesites” have similar nitrogen concentration to carbonado. ...
Image
Model for crystallisation of the megacryst suite in pegmatitic veins origin...
Published: 01 March 2009
. At the time of eruption, they would be cooled rapidly to ambient mantle conditions, resulting in the crystallisation of fibrous diamonds. Rapid cooling of residual liquids in the pegmatitic veins would lead to crystallisation of the framesites, as well as quench pyroxene-ilmenite xenoliths that have been
Journal Article
Syngenetic phlogopite inclusions in kimberlite-hosted diamonds: implications for role of volatiles in diamond formation
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 December 2009
Russ. Geol. Geophys. (2009) 50 (12): 1234–1248.
... ( Orlov, 1973 ) and Guaniamo ( Kaminsky et al., 2000 ; Sobolev et al., 1998 ) localities, respectively. Note that three samples belong to typical polycristalline aggregates (framesites) reported from many kimberlite pipes ( Kirkley et al., 1994 ; Orlov, 1973 ; Sobolev, 1974 ). Unlike the analyzed...
Journal Article
New textural evidence on the origin of carbonado diamond: An example of 3-D petrography using X-ray computed tomography
Journal: Geosphere
Publisher: Geological Society of America
Published: 01 October 2013
Geosphere (2013) 9 (5): 1336–1347.
...., 2005 ), although they are in some respects similar to other polymineralic diamond varieties such as framesites and yakutites ( McCall, 2009 ). Carbonado is set apart from other diamond varieties by several unusual characteristics. The diamond material is texturally diverse, being dominantly...
Journal Article
Morphology and defects of diamond grains in carbonado: clues to carbonado genesis
Vitaly A. Petrovsky, Andrei A. Shiryaev, Vladimir P. Lyutoev, Alexander E. Sukharev, Maximiliano Martins
Journal: European Journal of Mineralogy
Published: 01 January 2010
European Journal of Mineralogy (2010) 22 (1): 35–47.
... objective. Probably, the unusual smooth surface of the carbonado specimens can serve as a good discriminating criterion. Based on comprehensive isotopic analyses it was suggested ( Burgess et al. , 1998 ) that carbonado might be “an old framesite”, i.e. “common” polycrystalline diamond which underwent...
Journal Article
Internal texture and syngenetic inclusions in carbonado
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 February 2013
The Canadian Mineralogist (2013) 51 (1): 39–56.
... as yakutite. Different hypotheses have been proposed for the origin of carbonado, including the following: transformation of organic sedimentary carbon into diamond in a cold subducted slab ( Robinson 1978 ), possible geochemical transformation of framesite into carbonado over time ( Burgess et al. 1998...
Journal Article
AGES OF CRATONIC DIAMOND AND LITHOSPHERE EVOLUTION: CONSTRAINTS ON PRECAMBRIAN TECTONICS AND DIAMOND EXPLORATION
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 December 2010
The Canadian Mineralogist (2010) 48 (6): 1385–1408.
... of authors have proposed that polycrystalline diamond, for example “framesite” ( Heaney et al. 2005 ), containing silicate minerals whose isotopic and trace-element characteristics document remobilization of older carbon and silicate components, have crystallized shortly before kimberlite eruption ( e.g...
Journal Article
HENRYMEYERITE IN THE METASOMATIZED UPPER MANTLE OF EASTERN ANTARCTICA
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 June 2007
The Canadian Mineralogist (2007) 45 (3): 497–501.
... – 587 . Kurat , G. & Dobosi , G. ( 2000 ): Garnet and diopside-bearing diamondites (framesites) . Mineral. Petrol . 69 , 143 – 159 . Kurat , G. , Palme , H. , Embley-Isztin , A. , Touret , J. , Ntaflos , T. , Spettel , B. , Brandstatter , F...