Important Update News

The RRUFF Project is being updated to improve its interface and content. The beta version of the update is accessible to the public at RRUFF.net. New data is only being added to the beta site. Please note that it is in development, and some components are not functional. Existing RRUFF.info links will resolve to the new site after RRUFF.net is officially released.

We are grateful to NASA for the funding of this effort.

Humboldtine R170002

Browse Search Results 
<< Previous |  Back to Search Results |  Next >> 
Record 1113 of 2398  


Name: Humboldtine
RRUFF ID: R170002
Ideal Chemistry: Fe2+(C2O4)·2H2O
Locality: Zomba, Malawi
Source: Donald Doell [view label]
Owner: RRUFF
Description: Small yellow granular to short prismatic crystals with good cleavage on aegirine, associated with albite
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Groups: [ Humboldtine (3) ] [ Oxalate (13) ]
Quick search: [ All Humboldtine samples (2) ]
CHEMISTRY 
RRUFF ID: R170002.2
Sample Description: Microprobe Fragment
Measured Chemistry: EDS analysis only revealed Fe, with some Mn and Al.
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
DOWNLOADS:

  To download sample data,
  please select a specific
  orientation angle.
Direction of polarization of laser relative to fiducial mark:
X Min:    X Max:    X Sort:
BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R170002
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
DOWNLOADS:

Raman Data (Processed)
RRUFF File
POWDER DIFFRACTION 
RRUFF ID: R170002.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 12.1245(61)Å    b: 5.5160(24)Å    c: 9.8582(40)Å
alpha: 90°    beta: 128.240(16)°    gamma: 90°   Volume: 517.84(63)Å3    Crystal System: monoclinic
DOWNLOADS:
X Min:    X Max:    X Sort:
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