Roger H. Mitchell
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Mineralogy of a cuspidine–hiortdahlite–wollastonite skarn associated with the Sierra La Vasca alkaline complex, Mexico Open
The Tertiary Sierra La Vasca intrusive complex of the Mexican Eastern Alkaline Province consists of diverse alkaline-to-peralkaline granitoids and syenites and is a rare example of silica oversaturated peralkaline magmatism characterized b…
Composition and paragenesis of daqingshanite from the Kamthai carbothermalite, Rajasthan, India Open
Daqingshanite in the Kamthai REE deposit (India) occurs as two paragenetic types: primary granular coarse grained crystals coexisting with primary carbocernaite, baryte and bastnäsite; and as aligned micro-ovoid globules within clasts of S…
Magmatic and post-magmatic evolution of the Newania carbonatite complex, Rajasthan, north-western India Open
This work describes the mineralogy of dolomite carbonatite occurring at the Newania carbonatite complex, Rajasthan, north-western India. The mineralogy records the textural and compositional features of magmatic and post-magmatic stages of…
The genesis of calcite and dolomite carbonatite-forming magma by liquid immiscibility: a critical appraisal Open
Liquid immiscibility has become the preferred mode of genesis for the carbonatite rocks, which commonly, but not exclusively, accompany silicate rocks in alkaline-rock complexes. This concept has been universally based on the presumption t…
Petrology and Sr–Nd isotope geochemistry of Mosonik: a polygenetic phonolitic nephelinite–phonolite volcano located in the North Tanzanian Divergence of the East African Rift Open
Mosonik, a 3.25 Ma extensively dissected stratovolcano located in the North Tanzanian Divergence of the East African Rift, consists predominantly of phonolite and three types of phonolitic nephelinite distinguished by the presence or absen…
Scavenging and release of REE and HFSE by Na-metasomatism in magmatic-hydrothermal systems Open
Exploitable or potentially exploitable deposits of critical metals, such as rare-earth (REE) and high-field-strength elements (HFSE), are commonly associated with alkaline or peralkaline igneous rocks. However, the origin, transport and co…
Mount Mather Creek, British Columbia – a new sodalite-bearing carbohydrothermal breccia deposit including a new Canadian occurrence for the rare minerals edingtonite and quintinite Open
The Mount Mather Creek sodalite-bearing carbohydrothermal breccia dyke is located ~35 km northwest of Golden, British Columbia, Canada, within the Foreland Belt on the eastern side of the Mississippian-to-Devonian British Columbia Alkaline…
EDITORIAL: Creating testable questions in practical conservation: a process and 100 questions Open
It is now clear that the routine embedding of experiments into conservation practice is essential for creating reasonably comprehensive evidence of the effectiveness of actions. However, an important barrier is the stage of identifying tes…
NFD Methodology Report Open
The NetFlow Dynamics (NFD) model was developed for estimating the availability of a commodity supplied by a national- or regional-scale infrastructure following unexpected disruption of one or more of its components. The large scope of the…
Igneous Rock Associations 26. Lamproites, Exotic Potassic Alkaline Rocks: A Review of their Nomenclature, Characterization and Origins Open
Lamproite is a rare ultrapotassic alkaline rock of petrological importance as it is considered to be derived from metasomatized lithospheric mantle, and of economic significance, being the host of major diamond deposits. A review of the no…
Kimberlite genesis from a common carbonate-rich primary melt modified by lithospheric mantle assimilation Open
Diamond-bearing kimberlites were born from similar melts in the deep Earth and variably modified during ascent.
Tuffisitic kimberlites: mineralogical characteristics relevant to their formation Open
Tuffisitic kimberlites (TK) are the dominant components of many kimberlite pipes in southern Africa.These rocks are distinct from all other textural varieties of kimberlite.The objective of this study is to investigate the optically intrac…
Mineralogy of the baotite-bearing Gundrapalli lamproite, Nalgonda district, Telangana, India Open
We describe the mineralogy of a lamproite dyke from Gundrapalli village (Nalgonda district), Telangana, India. The dyke consists of a mineral assemblage characteristic of lamproites in terms of the presence of amphiboles (mainly potassic-r…
A new layout and update for <i>Mineralogical Magazine</i> in 2019 Open
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Accessory Rare Earth. Strontium, Barium and Zirconium Minerals in the Benfontein and Wesselton Calcite Kimberlites Open
Calcite kimberlites are rocks formed from highly differentiated kimberlite magma.As such they might be expected to possess an unusual mineralogy as a consequence of the concentration of incompatible elements in these residual magmas.To exa…
Mineralogy, petrology and petrogenesis of the kimberlite from Somerset Island, N.W.T., Canada Open
Mitchell and Fritz (1973) have given the first general description of the location, tectonic setting and mineralogy of the Somerset Island kimberlite.This paper deals with the mineralogy and texture in detail, interprets the crystalliza¬ t…
What’s in a Name? Suggestions for Revisions to the Terminology of Kimberlites and Lamprophyres from a Genetic Viewpoint Open
methoas ot anaiysl.ta tB.a.t,mi"atioS'^oI S"heiiSl"'" and isotopic composition of rocks and minerals ^ advances have not been matched by changes in our approach to the terminology of alkaline rocks.Modal classifications have remained essen…
Mineralogy of micaceous kimberlites from the New Elands and Star Mines, Orange Free State, South Africa Open
Micaceous kimberlites occur at the New Elands and Star Mines,Orange Free