Humboldtine R130689

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Record 4 of 12  

Name: Humboldtine
RRUFF ID: R130689
Ideal Chemistry: Fe2+(C2O4)·2H2O
Locality: Minas Gerais, Brazil
Source: Bob Jenkins [view label]
Owner: RRUFF
Description: Sample needs to be returned to Bob Jenkins after a picture can be taken of it. Label shows doubt as to the sample coming specifically from Minas Gerais.
Status: The identification of this mineral has been confirmed by single-crystal X-ray diffraction.
Mineral Groups: [ Humboldtine (3) ] [ Oxalate (12) ]
Quick search: [ All Humboldtine samples (2) ]
Sample Description: Unoriented Raman on the primary sample

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RRUFF ID: R130689
Sample Description: Unoriented Raman on the primary sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
RRUFF ID: R130689.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 11.965(2)Å    b: 5.583(1)Å    c: 9.834(2)Å
alpha: 90°    beta: 128.24(3)°    gamma: 90°   Volume: 515.9(2)Å3    Crystal System: monoclinic
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Calculated diffraction file.

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Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Humboldtine

American Mineralogist Crystal Structure Database Record: [view record]

Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file]

de Rivero M (1821) Note sur une combinaison de l'acide oxalique avec le fer trouvé à Kolowserux, près Belin en Bohéme, Annales de Chimie et de Physique, 18, 207-210   [view file]

Mazzi F, Garavelli C (1957) La struttura della oxalite, FeC2O4·2H2O, Periodico di Mineralogia, 26, 269-303

Frost R L, Weier M L (2003) Raman spectroscopy of natural oxalates at 298 and 77 K, Journal of Raman Spectroscopy, 34, 776-785   [link]

Echigo T, Kimata M (2008) Single-crystal X-ray diffraction and spectroscopic studies on humboldtine and lindbergite: weak Jahn-Teller effect of Fe2+ ion, Physics and Chemistry of Minerals, 35, 467-475

Echigo T, Kimata M (2010) Crystal chemistry and genesis of organic minerals: A review of oxalate and polycyclic aromatic hydrocarbon minerals, The Canadian Mineralogist, 48, 1329-1358   [view file]

Piro O E, Baran E J (2018) Crystal chemistry of organic minerals-salts of organic acids: the synthetic approach, Crystallography Reviews, 24, 149-175