Dondoellite R140175
Name: Dondoellite
RRUFF ID: R140175
Ideal Chemistry: Ca2Fe(PO4)2·2H2O
Locality: Messel mine, Messel, Darmstadt, Hesse, Germany
Source: Rock Currier [view label]
Owner: RRUFF
Description: Pale greenish white hemispherical or sheaflike aggregates of lamellar crystals, associated with anapaite (R141081). The cell parameters do not match messelite, but may be a related phase, perhaps a polytype. Needs more work.
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ fairfieldite (16) ]
Quick search: [ All Dondoellite samples (2) ]
CHEMISTRY 
RRUFF ID: R140175
Sample Description: Microprobe Fragment
Measured Chemistry: Ca1.98(Fe0.88Mg0.09)(P1.01O4)2·2H2O ; trace amount of Mn
Microprobe Data File: [ Download Excel File ]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented Raman on the primary sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R140175
Wavelength:
Sample Description: Unoriented Raman on the primary sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
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Raman Data (RAW) View Graph
RRUFF File
POWDER DIFFRACTION 
RRUFF ID: R140175.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 5.4780(7)Å    b: 5.7373(8)Å    c: 13.006(2)Å
alpha: 98.814(8)°    beta: 96.170(7)°    gamma: 108.537(7)°   Volume: 377.6(1)Å3    Crystal System: triclinic
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REFERENCES for Dondoellite

Miyawaki R, Hatert F, Pasero M, Mills S J (2021) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 63, Mineralogical Magazine, 85, 910-915   [view file]

Yang H, Gibbs R B, McGlasson J A, Jenkins, R A, Downs R T (2022) Dondoellite, Ca2Fe(PO4)2·2H2O, a new mineral species polymorphic with messelite, from Rapid Creek, Yukon, Canada, The Canadian Mineralogist, 60, 837-847   [view file]