Aenigmatite Group
A group of related mineral species
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About Aenigmatite Group
Member of:
Name:
Named after the first mineral of the Aenigmatite Group to be discovered, aenigmatite.
Unique Identifiers
Mindat ID:
40089
Long-form identifier:
mindat:1:1:40089:9
IMA Classification of Aenigmatite Group
IMA status notes:
IMA Approved Group Name
Approval history:
Approved by IMA in 2009 (Proposal 09–A, cfr. Mills et al. 2009)
Chemical Analysis
Oxide wt%:
| 1 | 2 | |
|---|---|---|
| SiO2 | 38.42 % | 38.73 % |
| TiO2 | 8.77 % | 8.95 % |
| ZrO2 | 0.06 % | 0.08 % |
| Al2O3 | 1.95 % | 1.98 % |
| Fe2O3 | 4.58 % | 3.92 % |
| FeO | 34.6 % | 34.3 % |
| MnO | 1.76 % | 1.53 % |
| MgO | 1.30 % | 1.50 % |
| ZnO | 0.06 % | 0.06 % |
| CaO | 1.44 % | 1.21 % |
| Na2O | 6.06 % | 6.27 % |
| K2O | 0.02 % | 0.10 % |
| Total: | 99.02 % | 98.63 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Kariåsen, Vesterøya, Sandefjord, Vestfold, Norway | XRF analysis and wet chemical analysis (Fe2+). Analyst: Alf Olav Larsen | |
| 2 | Buer, Vesterøya, Sandefjord, Vestfold, Norway | XRF analysis and wet chemical analysis (Fe2+). Analyst: Alf Olav Larsen |
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0007269 | Aenigmatite | Grew E S, Halenius U, Pasero M (2008) The crystal-chemistry of aenigmatite revisited: electron microprobe data, structure refinement and Mossbauer spectroscopy of aenigmatite from Vesteroya (Norway) European Journal of Mineralogy 20 983-991 | 2008 | Vesteroya, Vestfold District, Norway | 0 | 293 | |
| 0010476 | Wilkinsonite | Burt J B, Downs R T, Costin G (2007) Single-crystal X-ray refinement of wilkinsonite, Na2Fe2+4Fe3+2Si6O20. Acta Crystallographica E63 i122-i124 |  | 2007 | Warrumbungle Volcano, central New South Wales, Australia | 0 | 293 |
| 0010992 | Krinovite | Bonaccorsi E, Merlino S, Pasero M (1989) The crystal structure of the meteoritic mineral krinovite, NaNaMg2CrSi3O10 Zeitschrift fur Kristallographie 187 133-138 |  | 1989 | Wichita County, USA | 0 | 293 |
| 0002350 | Aenigmatite | Yang H, Konzett J (2000) High-pressure synthesis of Na2Mg6Si6O18(OH)2 - a new hydrous silicate phase isostructural with aenigmatite American Mineralogist 85 259-262 | | 2000 | 0 | 293 | |
| 0002100 | Aenigmatite | Gasparik T, Parise J B, Reeder R J, Young V G, Wilford W S (1999) Composition, stability, and structure of a new member of the aenigmatite group, Na2Mg4+xFe2-2xSi6+xO20, synthesized at 13-14 GPa American Mineralogist 84 257-266 | | 1999 | 0 | 293 | |
| 0000225 | Aenigmatite | Cannillo E, Mazzi F, Fang J H, Robinson P D, Ohya Y (1971) The crystal structure of aenigmatite sample FRO American Mineralogist 56 427-446 | | 1971 | 0 | 293 | |
| 0000224 | Aenigmatite | Cannillo E, Mazzi F, Fang J H, Robinson P D, Ohya Y (1971) The crystal structure of aenigmatite sample CM American Mineralogist 56 427-446 | | 1971 | 0 | 293 |
CIF Raw Data - click here to close
Other Language Names for Aenigmatite Group
Norwegian:Ænigmatitt Gruppen
Relationship of Aenigmatite Group to other Species
Member of:
Other Members of Sapphirine Supergroup:
| Beckettite | Ca2V6Al6O20 | Tric. 1 : P1 |
| Devilliersite | Ca4Ca2Fe3+10O4[(Fe3+10Si2)O36] | Tric. 1 : P1 |
| Khesinite | Ca4(Mg3Fe3+9)O4(Fe3+9Si3)O36 | Tric. 1 : P1 |
| Rhönite Group | Subgroup of the Sapphirine Supergroup. | |
| Sapphirine Group | Subgroup of the Sapphirine Supergroup. | |
| Surinamite | (Mg,Fe)3Al4BeSi3O16 | Mon. 2/m |
| 'UM1988-26-SiO:AlMg' | Mg4Al2O[Si3Al2O15] |
Aenigmatite Group Members:
| Aenigmatite | Na4[Fe2+10Ti2]O4[Si12O36] | Tric. 1 : P1 |
| Krinovite | Na2Mg4Cr3+2(Si6O18)O2 | Tric. 1 : P1 |
| 'UM1991-29-SiO:FeMgNa' | Na4(Mg5Fe3+7)O4[Si9Fe3+3O36] | |
| Wilkinsonite | Na2Fe2+4Fe3+2(Si6O18)O2 | Tric. 1 : P1 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Aenigmatite Group in petrology
An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for Aenigmatite Group
mindat.org URL:
https://www.mindat.org/min-40089.html
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References for Aenigmatite Group
Reference List:
Dornberger-Schiff, K., Merlino, S. (1974) Order–disorder in sapphire, aenigmatite and aenigmatite-like minerals. Acta Crystallographica Section A, 30 (2) 168-173 doi:10.1107/s0567739474000374
Kunzmann, Thomas (1999) The aenigmatite-rhönite mineral group. European Journal of Mineralogy, 11 (4) 743-756 doi:10.1127/ejm/11/4/0743
Localities for Aenigmatite Group
Showing 364 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Warrumbungles, New South Wales, Australia