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Whiteite-(CaMnMg) R140770

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Name: Whiteite-(CaMnMg)
RRUFF ID: R140770
Ideal Chemistry: CaMn2+Mg2Al2(PO4)4(OH)2·8H2O
Locality: Tip Top mine, Fourmile, Custer District, Custer County, South Dakota, USA
Source: Thomas A. Loomis [view label]
Owner: RRUFF
Description: Light tan with triangular striated faces, associated with deep red roscherite and colorless acicular sprays of tiptopite. Crystals are twinned by a 2-fold rotation around a*.
Status: The identification of this mineral has been confirmed only by single crystal X-ray diffraction.
Mineral Group: [ Jahnsite (7) ]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R140770
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 50% of 150mW
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Raman Data (Processed)
RRUFF File
POWDER DIFFRACTION 
RRUFF ID: R140770
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 14.709(8)Å    b: 6.949(4)Å    c: 9.929(5)Å
alpha: 90°    beta: 108.78(2)°    gamma: 90°   Volume: 960.8(8)Å3    Crystal System: monoclinic
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REFERENCES for Whiteite-(CaMnMg)

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]

Fleischer M, Chao G Y, Pabst A (1979) New mineral names, American Mineralogist, 64, 464-467   [view file]

Grice J D, Dunn P J, Ramik R A (1989) Whiteite-(CaMnMg), a new mineral species from the Tip Top pegmatite, Custer, South Dakota, The Canadian Mineralogist, 27, 699-702   [view file]

Jambor J L, Grew E S (1990) New mineral names, American Mineralogist, 75, 931-937   [view file]