Hydroxycalciomicrolite R130269


Name: Hydroxycalciomicrolite
RRUFF ID: R130269
Ideal Chemistry: Ca1.5Ta2O6(OH)
Locality: Volta Grande, Minas Gerais, Brazil
Source: Marcelo Andrade
Owner: RRUFF
Description: Yellow dodecahedra and octahedra, type sample
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Groups: [ pyrochlore (27) ] [ microlite (15) ]
CHEMISTRY 
RRUFF ID: R130269.2
Sample Description: Microprobe Fragment
Measured Chemistry: (Ca1.48Na0.06Mn0.01)Σ1.55(Ta1.88Nb0.11Sn0.01)Σ2O6[(OH)0.76F0.20O0.04]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented Raman on the primary sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R130269
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Sample Description: Unoriented Raman on the primary sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
POWDER DIFFRACTION 
RRUFF ID: R130269.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 10.4211(8)Å    b: 10.4211(8)Å    c: 10.4211(8)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 1131.7(2)Å3    Crystal System: cubic
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REFERENCES for Hydroxycalciomicrolite

Williams P A, Hatert F, Pasero M, Mills S J (2013) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 18. New minerals and nomenclature modifications approved in 2013, Mineralogical Magazine, 77, 3249-3258

Andrade M B, Yang H, Atencio D, Downs R T, Chukanov N V, Lemée-Cailleau M H, Persiano A I C, Goeta A E, Ellena J (2017) Hydroxycalciomicrolite, Ca1.5Ta2O6(OH), a new member of the microlite group from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil, Mineralogical Magazine, 81, 555-564