..., Chile. Associated minerals are salammoniac, halite, dittmarite, joanneumite, chanabayaite, nitratine, natroxalate and möhnite. Triazolite occurs as deep blue prismatic crystals up to 0.1 mm × 0.15 mm × 0.75 mm and their radial aggregates up to 1.5 mm across. The mineral is brittle. Its Mohs hardness...

... of this production, and it commences with native elements, followed by sulphides and sulphosalts; halides; oxides and hydroxides; silicates (in 212 pp.); phosphates; arsenates and vanadates; molybdates; sulphates; carbonates; a lone oxalate (natroxalate) and ends with a list of 35 inadequately characterized minerals...

..., Bavaria, Germany ( Lorenz 1995 ). Natroxalate was described from the Shomiokitovoye agpaitic pegmatite, at the northern flank of the Umbozero mine, Lovozero, Kola Peninsula, crystallized from hydrothermal hyperalkaline oxalate-carbonate solution ( Khomyakov 1996 ). M anuscript handled by M aria...

... ) and wheatleyite, Na 2 Cu(C 2 O 4 ) 2 ·2H 2 O (Rouse et al . 1986 ). Middlebackite is only the third known anhydrous oxalate mineral along with natroxalate, Na 2 (C 2 O 4 ), (Khomyakov, 1996 ) and antipinite and is the only organic mineral to contain an OH group that is not part of a complex organic anion...

...F ig . 1. Crystal structures of (a) natroxalate, Na 2 (C 2 O 4 ) ( Jeffrey & Parry 1954 ), (b) Rb 2 (C 2 O 4 )·H 2 O ( Echigo & Kimata 2006 ), (c) Cs 2 (C 2 O 4 )·2H 2 O ( Kholodkovskaya et al. 1990 ) and (d) Tl 2 (C 2 O 4 ) ( Nagy et al. 2005 ). All the oxalate complexes have...

.... 2009 ). It is important for the interpretation to bear in mind that alkali carbonate, oxalate, and other abiogenic C-bearing species occur in alkaline igneous rock complexes ( Nivin et al. 2005 ). The presence of bitumen, oxalate minerals (natroxalate and whewellite), carboxylate compounds...

.... TABLE 15. COMPATIBILITY INDICES FOR NITRATE MINERALS Complete data are available for seventeen oxalate minerals, and only two fall into categories other than superior or excellent ( Table 16 ). Lindbergite and natroxalate have compatibilities of fair and good, respectively. Further study...

... cavities of a giant pegmatite: with albite, aegirine, shortite, rhodochrosite, epididymite, leifite, tainiolite, pyrrhotite, thermonatrite, nahpoite, and amorphous bitumen; with albite, aegirine, elpidite, lorenzenite, sphalerite, galena, shomiokite-(Y), trona, natron, and natroxalate; with elpidite...

... to the spectrum of phoxite, (NH 4 ) 2 Mg 2 (C 2 O 4 )(PO 3 OH) 2 (H 2 O) 4 (Kampf et al. , 2019) and other oxalate minerals (e.g. weddellite, wheatleyite, moolooite, natroxalate, oxammite and glushinskite) (Frost, 2004 , 2008 ) (Peterson and Pullman, 2016 ) as described below. The Raman bands at 1722 cm...

... lavas natroxalate Na 2 C 2 O 4 X Water-soluble alkaline massif mineral koktaite (NH 4 ) 2 Ca(SO 4 ) 2 ·H 2 O X Water-soluble coal mine dump mineral lecontite (NH 4 )Na(SO 4 )·2H 2 O X Water-soluble mineral from bat guano minasragrite V 4+ O(SO 4 )·5H 2 O X X Water...

..., halite, joanneumite, natroxalate, nitratine, chanabayaite, and a clay mineral. Möhnite crystals overgrow crystalline crusts of salammoniac and encrust cavities in salammoniac aggregates and form random aggregates and clusters (up to 1 mm across), as well as crusts consisting of imperfect bipyramidal...

...], glushinskite [Mg(C 2 O 4 )·2H 2 O], humboldtine [Fe(C 2 O 4 )·2H 2 O], lindbergite [Mn(C 2 O 4 )·2H 2 O], natroxalate [Na 2 (C 2 O 4 )], and oxammite [(NH 4 ) 2 (C 2 O 4 )·H 2 O] (the latter a biomineral known exclusively from guano deposits). Water-based clathrates, also known as gas hydrates or clathrate...

... and their radial aggregates up to 1.5 mm in diameter which occur in cavities in aggregates of salammoniac with subordinate halite near the contact of a guano with the host rock, or grow over the surface of the host rock. Other associated minerals are dittmarite, joanneumite, chanabayaite, nitratine, natroxalate...

... oxalates with single cations include A 2 1+ (C 2 O 4 ) with A 1+ = Li, K, Rb, Cs, and Ag [also represented by the mineral natroxalate, Na 2 (C 2 O 4 )]; A 2 1+ (C 2 O 4 )·H 2 O with A 1+ = K, Rb, and Cs; A 2+ (C 2 O 4 )·2H 2 O with A 2+ = Co, Ni, Zn, and Pb [also humboldtine group minerals...