...Ferdinando Bosi; Frédéric Hatert; Marco Pasero; Stuart J. Mills; Ritsuro Miyawaki; Ulf Hålenius Abstract In this communication we present a brief response to Hawthorne ( 2023 ) who, in a paper in volume 87, doi.org/10.1180/mgm.2023.8 (this journal), claims evidence for violations...

... developed these for several major groups of minerals (borates, sulfates, phosphates, aluminofluorides, vanadates, beryllates). Brown (2002: Bond-Valence Theory) christened Hawthorne’s proposal The Structural Hierarchy Hypothesis and this approach is now in general use by others to organize and understand...

.... The account in general uses the present IMA-approved names, based on the 1997 and 2003 schemes but also expounds two new possible schemes by Hawthorne and Oberti, both based on using the total charge in the C Group cations instead of the present scheme, which has Si in the formula unit as a classifying...

...G. Diego Gatta In this second volume of the Mineralogical Society’s ‘Landmark’ series, Prof. Frank Hawthorne has selected a number of key papers, some of which are true milestones of mineralogy and crystallography, showing the acceleration of research and the increase in knowledge in the field...

...Mark P. S. Krekeler Abstract The sedimentology and mineralogy of a 2.5 m core from a palygorskite deposit of the Miocene Hawthorne Formation, southern Georgia is described. The lithology involves laminated clay-rich sediment composed of ~90% clay and 10% sand, with six clay-pebble layers present...

...Mark P. S. Krekeler; Stephen Guggenheim; John Rakovan Abstract A microtexture analysis by TEM and AFM of palygorskite deposits from the Hawthorne Formation, southern Georgia is given. Palygorskite is the dominant mineral comprising an average of 65–70% of the sample volume with smaller volumes...

... to visit and collaborate with, and I want to acknowledge my debt to its founder, the late Pep Rossi, a scientist of great vision who I was proud to call my friend. © 2000 Mineralogical Association of Canada 2000 Frank Hawthorne began his career working on the crystal chemistry of amphiboles...

...Grover Harry Emrich Abstract The Miocene Hawthorne formation of northern Florida and southwestern Georgia consists principally of unconsolidated sands and thin beds of clay. It was studied to investigate the relationship between direction of cross-bedding and textural variations. From 24 outcrops...

...Siemon WM. Muller; Henry G. Ferguson Abstract Mesozoic rocks of the Hawthorne and Tonopah quadrangles include Triassic and Lower Jurassic formations that occur in isolated areas in the different mountain ranges of the area and have a maximum thickness of 30,000 feet. The mapped formations are (from...

...John S. Compton; Donald L. Hall; David J. Mallinson; David A. Hodell Abstract In addition to large amounts of phosphorite, the Miocene Hawthorn Group of Florida contains abundant dolomite. Dolomite is present as disseminated silt-size rhombs, as friable dolosilt beds, and as pore-filling cement...

...J. DANIEL BRYANT; BRUCE J. MACFADDEN; PAUL A. MUELLER Abstract Several geochronologic methods are used to constrain the ages of the early to middle Miocene Hawthorn and Alum Bluff Groups in the eastern Florida panhandle. The Dogtown Member of the upper Torreya Formation (Hawthorn Group) in northern...