Tweddillite R120125
Name: Tweddillite
RRUFF ID: R120125
Ideal Chemistry: CaSrMn3+2Al(Si2O7)(SiO4)O(OH)
Locality: Wessels mine, Kalahari manganese field, Cape Province, South Africa
Source: William W. Pinch [view label]
Owner: RRUFF
Description: Sprays of dark red elongated crystals
Status: The identification of this mineral has been confirmed only by single crystal X-ray diffraction.
Mineral Groups: [ clinozoisite (16) ] [ epidote (31) ]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R120125
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Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
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Raman Data (Processed)
RRUFF File
POWDER DIFFRACTION 
RRUFF ID: R120125.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 8.913(2)Å    b: 5.661(2)Å    c: 10.249(4)Å
alpha: 90°    beta: 114.55(2)°    gamma: 90°   Volume: 470.3(1)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
RRUFF File
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REFERENCES for Tweddillite

American Mineralogist Crystal Structure Database Record: [view record]

Armbruster T, Gnos E, Dixon R, Gutzmer J, Hejny C, Döbelin N, Medenbach O (2002) Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals, Mineralogical Magazine, 66, 137-150   [view file]

Jambor J L, Roberts A C (2003) New mineral names, American Mineralogist, 88, 251-255   [view file]

Armbruster T, Bonazzi P, Akasaka M, Bermanec V, Chopin C, Giere R, Huess-Assbichler S, Liebscher A, Menchetti S, Pan Y, Pasero M (2006) Recommended nomeclature of epidote-group minerals, European Journal of Mineralogy, 18, 551-567   [view file]

Revheim O, King V T (2016) Epidote supergroup nomenclature: The names hancockite, niigataite and tweddillite reinstated, Mineralogical Magazine, 80, 877-880   [view file]