Robertsite R120040
Name: Robertsite
RRUFF ID: R120040
Ideal Chemistry: Ca2Mn3+3O2(PO4)3·3H2O
Locality: Tip Top mine, Custer County, South Dakota, USA
Source: Mark N. Feinglos [view label]
Owner: RRUFF
Description: Dark reddish brown plates on bobdownsite. This sample was used to determine the structure reported in Andrade et al (2012)
Status: The identification of this mineral has been confirmed by X-ray diffraction and chemical analysis
Mineral Group: [ Arseniosiderite (5) ]
Quick search: [ All Robertsite samples (2) ]
CHEMISTRY 
RRUFF ID: R120040.2
Sample Description: Composition is from the type sample
Measured Chemistry: Ca1.93(Mn2.92Fe0.07)Σ=2.99O1.84(PO4)3.04·2.72H2O
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R120040
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 80% of 150mW
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Raman Data (Processed)
RRUFF File
Raman Data (RAW) View Graph
RRUFF File
POWDER DIFFRACTION 
RRUFF ID: R120040.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 17.3400(9)Å    b: 19.446(1)Å    c: 11.2787(6)Å
alpha: 90°    beta: 96.634(3)°    gamma: 90°   Volume: 3777.7(5)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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DIF File
X-ray Data (XY - RAW) View Graph
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REFERENCES for Robertsite

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]

Moore P B, Ito J (1974) I. Jahnsite, segelerite, and robertsite, three new transition metal phosphate species II. Redefinition of overite, an isotype of segelerite III. Isotypy of robertsite, mitridatite, and arseniosiderite, American Mineralogist, 59, 48-59   [view file]

Van Kauwenbergh S J, Cooper-Fleck M, Williams M R (1988) The occurrence of robertsite in a sedimentary phosphate ore from Thailand, Mineralogical Magazine, 52, 505-508   [view file]

Jambor J L, Burke E A J (1989) New mineral names, American Mineralogist, 74, 1399-1404   [view file]

Andrade M B, Morrison S M, Di Domizio A J, Feinglos M N, Downs R T (2012) Robertsite, Ca2MnIII3O2(PO4)3·3H2O, Acta Crystallographica, E68, i74-i75   [view file]