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Magniotriplite
A variety of Wagnerite
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About Magniotriplite
Formula:
(Mg,Fe2+,Mn2+)2PO4F
Colour:
Reddish-brown.
Lustre:
Vitreous
Hardness:
4
Crystal System:
Monoclinic
Name:
Named in 1951 by Ginzburg et al. for the supposed relation to triplite.
A discredited iron- and magnesium-rich structural variety (polytype) of wagnerite.
Originally described from Karasu granite pegmatite, Turkestan Range, Osh Oblast, Kyrgyzstan and Kyrk-Bulak granite pegmatite, Turkestan Range, Osh Oblast, Kyrgyzstan.
Originally described from Karasu granite pegmatite, Turkestan Range, Osh Oblast, Kyrgyzstan and Kyrk-Bulak granite pegmatite, Turkestan Range, Osh Oblast, Kyrgyzstan.
Unique Identifiers
Mindat ID:
2540 (as Magniotriplite)
4229 (as Wagnerite)
4229 (as Wagnerite)
Long-form identifier:
mindat:1:1:2540:5 (as Magniotriplite)
mindat:1:1:4229:7 (as Wagnerite)
mindat:1:1:4229:7 (as Wagnerite)
IMA Classification of Magniotriplite
Discredited
Classification of Magniotriplite
41.6.1.3
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
22.1.24
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
Physical Properties of Magniotriplite
Optical Data of Magniotriplite
Type:
Biaxial (+)
RI values:
nα = 1.641 nβ = 1.649 nγ = 1.661
2V:
Measured: 60° , Calculated: 80°
Max. Birefringence:
δ = 0.020
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
relatively weak
Chemistry of Magniotriplite
Mindat Formula:
(Mg,Fe2+,Mn2+)2PO4F
Element Weights:
Crystallography of Magniotriplite
Crystal System:
Monoclinic
Cell Parameters:
a = 11.92 Å, b = 12.27 Å, c = 9.66 Å
β = 107.18°
β = 107.18°
Ratio:
a:b:c = 0.971 : 1 : 0.787
Unit Cell V:
1,349.82 ų (Calculated from Unit Cell)
Synonyms of Magniotriplite
Other Language Names for Magniotriplite
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.
Internet Links for Magniotriplite
mindat.org URL:
https://www.mindat.org/min-2540.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
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References for Magniotriplite
Reference List:
Ren, L., Grew, E. S., Xiong, M., Ma, Z. (2003) Wagnerite-Ma5bc, a new polytype of Mg2(PO4)(F,OH), from granulite-facies paragneiss, Larsemann Hills, Prydz Bay, East Antarctica. The Canadian Mineralogist, 41 (2) 393-411 doi:10.2113/gscanmin.41.2.393
Chopin, Christian, Armbruster, Thomas, Grew, Edward S., Baronnet, Alain, Leyx, Catherine, Medenbach, Olaf (2014) The triplite–triploidite supergroup: structural modulation in wagnerite, discreditation of magniotriplite, and the new mineral hydroxylwagnerite. European Journal of Mineralogy, 26 (4) 553-565 doi:10.1127/0935-1221/2014/0026-2386
Localities for Magniotriplite
Showing 10 localities.
symbol to view information about a locality.
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.
Australia | |
| Lottermoser et al. (1997) |
Kyrgyzstan | |
| [DAN-SSSR (1951) +2 other references |
| Pekov (1998) |
Russia | |
| Trunilina et al. (2024) |
Spain | |
| Roda et al. (2001) |
| Roda et al. (2004) +1 other reference |
| Bareche (2005) |
| & locality references +1 other reference | |
Sweden | |
| |
| Wik et al. (2005) |
Karasu-Karavshinskoye, Turkestan Ridge, Batken Region, Kyrgyzstan