	Varentsov, Igor M (2002) Genesis of the Eastern Paratethys manganese ore giants: impact of events at the Eocene/Oligocene boundary. Ore Geology Reviews, 20 (1) 65-82 doi:10.1016/s0169-1368(02)00039-2	Journal (article/letter/editorial)
	western ore field, Ordzhonikidze area, Shevchenko quarry (Varentsov et al., 1997). 1—Miocene clays, limestone...todorokite (10%), quartz (<5%). Aleksandrovskii quarry, eastern face; 3—Sample 2/3. Manganese carbonate...clinoptilolite (10 – 15%), quartz (10%). Aleksandrovskii quarry, eastern face; 4—Sample 2/8. Oxyhydroxide ore:...pyrolusite (5 – 10%), quartz (to 5%). Aleksandrovskii quarry, eastern face; 5—Sample n-91-23. Mn-oxidized ore...mixed-layered smectite-mica phase (<5%). Shevchenko quarry; 6—Sample n-91-13a. Mn carbonate – manganite ore
	Holland, H. D. (2005) 100th Anniversary Special Paper: Sedimentary Mineral Deposits and the Evolution of Earth's Near-Surface Environments. Economic Geology, 100 (8) 1489-1509 doi:10.2113/gsecongeo.100.8.1489	Journal (article/letter/editorial)
	V.A., Baturin, G.N., Leipe, T., Bahlo, R., and Bonacker, P., 1997, Environments of formation of ferromanganese...seawater chemistry and the timing of Precambrian aragonite seas and calcite seas: Geology, v. 31, p. 785–788
	*Mackenzie, F.T. - Ed.* (2005) Treatise on Geochemistry - Sediments, Diagenesis, and Sedimentary Rocks Vol. 7 - Treatise on Geochemistry. Elsevier, Amsterdam.**	Book
	Fe)2SiO4 (Mg,Fe)2Si2O6 Lithogenous Calcite Aragonite Opal Francolite Barite Celestite CaCO3; (Ca12xMgx)CO3...and thus with increasing depth in the oceans. Aragonite is ,1.45 times more soluble than calcite (Morse...discussion in Morse and Mackenzie, 1990). The aragonite compensation depth (ACD) generally averages around...other topographic highs. Although calcite and aragonite are both made up of calcium carbonate, the different...sodium can substitute for calcium in skeletal aragonite (Speer, 1983). Magnesian 6 Chemical Composition
	*(ed.), Davis A.M., (ed.), Holland H.D., (ed.), Turekian K.K. (2003) Treatise on Geochemistry* - Meteorites, Comets and Planets Vol. 1 - Treatise on Geochemistry. Elsevier, Amsterdam.**	Book
	of the Elements H. Palme Universität zu Köln, Germany and A. Jones Université Paris Sud, France 1.03...Mantle Composition H. Palme Universität zu Köln, Germany and Hugh St. C. O’Neill Australian National University...(Baikal region, Russia) and the Hessian Depression (Germany). Two important 8 Cosmochemical Estimates of...Vitim (Baikal region) and Hessian Depression (Germany). The FeO contents are, similar to Cr in Figure...Hofmann Max-Plank-Institut für Chemie, Mainz, Germany and Lamont-Doherty Earth Observatory, Palisades

Aragonite from Bonacker quarry, Gedern, Wetteraukreis, Darmstadt, Hesse, Germany

Aragonite from
Bonacker quarry, Gedern, Wetteraukreis, Darmstadt, Hesse, Germany