Melanotekite R090032

Name: Melanotekite
RRUFF ID: R090032
Ideal Chemistry: Pb2Fe3+2O2(Si2O7)
Locality: Kombat, Namibia
Source: William W. Pinch [view label]
Owner: RRUFF
Description: Black, massive exhibiting greasy luster, associated with colorless to pale brown bladed yangite (R090031). Sample is from the John Innes collection.
Status: The identification of this mineral has been confirmed only by single crystal X-ray diffraction.
Sample Description: Unoriented sample

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RRUFF ID: R090032
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
RRUFF ID: R090032.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 6.987(2)Å    b: 11.045(2)Å    c: 10.065(2)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 776.7(2)Å3    Crystal System: orthorhombic
  File Type Information Close
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 Melanotekite

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]

Lindström G (1880) Analyser af tvenne mineral från Långban, Öfversigt af Kongliga Vetenskaps-Akademiens Förhandlingar, 37, issue 6 53-58   [view file]

Ito J, Frondel C (1966) Syntheses of the kentrolite-melanotekite series, Arkiv för Mineralogi och Geologi, 4, 387-390

Welin E (1968) Notes on the mineralogy of Sweden 6. X-ray powder data for minerals from Långban and the related mineral deposits of Central Sweden, Arkiv för Mineralogi och Geologi, 4, 499-541

Moore P B, Sen Gupta P K, Shen J, Schlemper E O (1991) The kentrolite-melanotekite series, 4Pb2(Mn,Fe)3+2O2[Si2O7]: Chemical crystallographic relations, lone-pair splitting, and cation relation to 8URe2, American Mineralogist, 76, 1389-1399   [view file]

Dörsam G, Liebscher A, Wunder B, Franz G (2008) Crystal structures of synthetic melanotekite (Pb2Fe2Si2O9), kentrolite (Pb2Mn2Si2O9), and the aluminum analogue (Pb2Al2Si2O9), American Mineralogist, 93, 573-583   [view file]