...Alexander P. Hammond; Alan R. Carroll; Ethan C. Parrish; M. Elliot Smith; Tim K. Lowenstein Abstract Deposition of trona, nahcolite, and other Na-carbonate evaporite minerals in lakes is commonly closely associated with active volcanism, suggesting that the excess alkalinity required...

... with the appropriate weight percent of H 2 O given in Reactions 1–3 (for details, see the Data Repository). Growth and breakdown of nahcolite, trona, and natron were quantified by X-ray diffraction (XRD), where peak-area ratios of the phases were compared to the original starting reaction mixture (Tables DR1–DR3...

...Earl O’Bannon, III; Christine M. Beavers; Quentin Williams Abstract Single-crystal X-ray diffraction of trona, Na 3 CO 3 HCO 3 ·2H 2 O, was measured between 100 and 340 K at ambient pressures, and the infrared and Raman spectra of this material characterized to ~25 GPa. The thermal expansion...

... (Na 2 CO 3 ·H 2 O) and trona (Na 3 (CO 3 )(HCO 3 )·2H 2 O), hereafter called ASC, (b) mixtures of ASC with CaCO 3, and (c) mixtures of ASC with CaCO 3 and a Ca 2+ -rich bentonite at different moisture contents, to distinguish natural and alkali-activated bentonites by simultaneous thermal analysis...

...R. H. Mitchell Abstract Stalactites formed by the chemical weathering of natrocarbonatite lava decorate the roofs of hollow inactive hornitos at Oldoinyo Lengai, Tanzania. The stalactites are composed principally of trona with lesser and very variable amounts of nahcolite, (NaHCO 3 ), thermonatrite...

... Calcite NMR spectroscopy bicarbonate trona nahcolite hydrogen bond Interaction with organic matter has a large influence on the precipitation and growth of calcite as both biomineral and in abiogenic settings. As a result, naturally occurring calcite from many low-temperature environments...

... quenched lavas. The lapilli were altered at low temperature (<50°C) by degassing to aggregates of sodian sylvite, potassian halite, trona, thermonatrite and a novel F-bearing sodium phosphate-carbonate. The latter is considered to be a new mineral as it has a composition (Na 5–4.5 PO 4 (CO 3, F,Cl...

...Brian Jones; Robin W. Renaut Abstract Skeletal crystals are hollow crystals that develop because their outer walls grow before their cores. The presence of skeletal crystals of calcite (three types--trigonal prisms, hexagonal prisms, and plates) and trona in hot (>90 degrees C) spring deposits...

...Raymond Sullivan ABSTRACT Wilkins Peak Member of the Green River Formation, with its interbeds of trona, oil shale, and dolomitic mudstone, contrasts markedly with the predominantly oil-shale and calcitic mudstone sequences of the remainder of the succession. Much discussion has centered...

... deposits (> 10 ka). Cements observed include calcite, aragonite, protodolomite(?), amorphous silica, iron hydroxide, smectite, trona, and halite. Cementation is controlled by the availability of water, with several hydrologic subenvironments producing different cements. Evaporative cementation in dunes...

...Henry W. Roehler ABSTRACT The Wilkins Peak Member, the saline unit of the Green River Formation in southwest Wyoming, is more than 985 ft (300 m) thick and contains more than 35 beds of trona or trona with halite. The trona and halite were deposited in the deepest part of the basin of Lake Gosiute...

...-pebble conglomerate (A), oil shale (B), mudstone (C), lime sandstone (D), and also trona. These cycles are I: A-B-C, II: D-B-C, III: D-C, and IV: B-trona-C. Individual cycles have been correlated over distances of up to 24 km. The Wilkins Peak Member is thought to have been deposited in a playa-lake...

... and calcareous cements. The mud-flat facies is characterized by calcite and (or) dolomite. The lacustrine facies is characterized either by trona (sodium carbonate) or by oil shale (either calcitic or dolomitic). The regional distribution pattern of lithologic facies and mineral zones in the Green River...