Guyanaite R070444

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Record 1709 of 4084  


Name: Guyanaite
RRUFF ID: R070444
Ideal Chemistry: CrO(OH)
Locality: Merume river, Kamakusa, Mazaruni District, Guyana
Source: Michael Scott S104672 [view label]
Owner: RRUFF
Description: Black alluvial grains, a mixture of guyanaite, bracewellite, eskolaite and quartz, colloquially known as merumite
Status: The identification of this mineral has been confirmed only by X-ray diffraction
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R070444
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
POWDER DIFFRACTION 
RRUFF ID: R070444.1
Sample Description: Powder, mixture includes bracewellite, eskolaite and quartz
Cell Refinement Output: a: 4.8773Å    b: 4.3111Å    c: 2.9547Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 62.127Å3    Crystal System: orthorhombic
  File Type Information Close
Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

  File Type Information Close
Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Guyanaite

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]

Christensen N, Hansen P, Lehmann M S (1976) Isotope effects in the bonds of β-CrOOH and β-CrOOD, Journal of Solid State Chemistry, 19, 299-304

Milton C, Appleman D E, Appleman M H, Chao E C T, Cuttita F, Dinnin J I, Dwornik E J, Ingram B L, Rose H J (1976) Merumite, a complex assemblage of chromium minerals from Guyana, U.S. Geological Survey Professional Paper, 887, 1-29   [view file]

Fleischer M, Cabri L J, Nickel E H, Pabst A (1977) New mineral names, American Mineralogist, 62, 593-600   [view file]

Jahn S, Wunder B, Koch-Müller M, Tarrieu L, Pöhle M, Watenphul A, Taran M N (2012) Pressure-induced hydrogen bond symmetrisation in guyanaite, β-CrOOH: evidence from spectroscopy and ab initio simulations, European Journal of Mineralogy, 24, 839-850

Schultze D J, Flemming R L, Shepherd P H M, Helmstaedt H (2014) Mantle-derived guyanaite in a Cr-omphacite xenolith from Moses Rock diatreme, Utah, American Mineralogist, 99, 1277-1283