Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (3) Citing Articles via Google Scholar Google Scholar Articles by Atencio, D. Articles by Menezes Filho, L. A.D. Search for Related Content GeoRef GeoRef Citation

Lindbergite, a new Mn oxalate dihydrate from Boca Rica mine, Galiléia, Minas Gerais, Brazil, and other occurrences

¹ Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508-080, São Paulo, SP, Brazil
² Naturhistorisches Museum, Augustinerstrasse 2, CH-4001 Basel, Switzerland
³ Mineralogisches Institut, Bernoullistrasse 30, CH-4056 Basel, Switzerland
⁴ Museu Jobas de Ciências Naturais "José Bonifácio de Andrada e Silva" Rua Martim Afonso, 24, Biquinha, 11310-010, São Vicente, SP, Brazil
⁵ Rua Esmeralda, 534–Prado, 30410-080, Belo Horizonte, MG, Brazil

Correspondence: ^* E-mail: datencio{at}usp.br

The new mineral lindbergite, Mn(C₂O₄)•2H₂O, is a secondary mineral in the Lavra da Boca Rica granite pegmatite, Sapucaia do Norte, Galiléia Co., Minas Gerais, Brazil. It occurs as: (1) white short prismatic crystals 0.1 to 0.3 mm in length, interpreted as pseudomorphs after the orthorhombic trihydrate, with faces of {100}, {hk0}, {010}, and {0kl} forms, rounded edges, and twinning on (010); and (2) grayish-white aggregates in 0.1 mm thick translucent crusts made up of interlocking irregularly contoured platelets up to 0.03 mm in length. Lindbergite is transparent, has a white streak, vitreous luster, a perfect cleavage parallel {010}, and is non-fluorescent. The Mohs’ hardness is 2 and its tenacity crumbly. The measured density is 2.10(3) g/cm³ (calculated 2.251 g/cm³). Lindbergite is biaxial negative, with n = 1.424(3), n_ß = 1.550(3), n = 1.65(1) (white light), 2V (obs.) = 80(2)°, 2V (calc.) = 77°. Dispersion is not detectable or very weak with r > v. Orientation Y ^ c = 20°. The empirical composition is (Mn_1.11Na_0.01Al_0.01)_1.13(C_1.94O₄)•2.15H₂O. The mineral is monoclinic, C2/c, a = 11.995(5), b = 5.632(2), c = 9.967(7) Å, ß = 128.34(4)°, V = 528.1(5) ų, Z = 4. Lindbergite is the Mn analogue of humboldtine and glushinskite. Associated minerals at the type locality are the phosphates triphylite, phosphosiderite, frondelite, strengite, cyrilovite, bermanite, rockbridgeite, huréaulite, tavorite, reddingite, heterosite, laueite, and unidentified minerals. Additional occurrences of lindbergite are from Parsettens, Grisons, Switzerland, the Lecht Mines, Banffshire, Scotland, and the Morefield Pegmatite, Amelia, Virginia. Lindbergite also has been recorded from three localities in the Black Forest, Germany: Clara Mine, Oberwolfach, Wolfach Valley, Baden-Württemberg; Ortenberg near Offenburg; and Gremmelsbach near Triberg, but the natural origin was not firmly established for the last one. An occurrence of orthorhombic Mn(C₂O₄)•3H₂O has been reported at Falotta, Grisons, Switzerland.

This article has been cited by other articles:

				J. A. Mandarino NEW MINERALS Can Mineral, December 1, 2004; 42(6): 1901 - 1928. [Full Text] [PDF]