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Oxo-magnesio-hastingsite

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About Oxo-magnesio-hastingsiteHide

Formula:
NaCa2(Mg2Fe3+3)(Al2Si6)O22O2
Oxo-magnesio-hastingsite is defined as an amphibole with
wO > 1 apfu
zTi<0.5 apfu and
A position: Na dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
Colour:
Brown
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.19
Crystal System:
Monoclinic
Name:
Name derived from hastingsite based on guidelines from Hawthorne et al. (2012): Nomenclature of the amphibole supergroup.
Originally IMA proposed name: Ferrikaersutite (proposal 2011-035), but changed to oxo-magnesiohastingsite, to be consistent with the new amphibole nomenclature (CNMNC Newsletter No. 16, August 2013).
This page provides mineralogical data about Oxo-magnesio-hastingsite.


Classification of Oxo-magnesio-hastingsiteHide

Approved
Approval Year:
2013

Physical Properties of Oxo-magnesio-hastingsiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Brown
Streak:
White
Hardness:
Hardness Data:
Measured
Comment:
Hardness is approximate
Cleavage:
Perfect
{110}
Fracture:
Irregular/Uneven
Density:
3.19 g/cm3 (Measured)    3.219 g/cm3 (Calculated)

Optical Data of Oxo-magnesio-hastingsiteHide

Type:
Biaxial (-)
RI values:
nα = 1.706(2) nβ = 1.715(2) nγ = 1.720(2)
2V:
Calculated: 73°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v, weak
Pleochroism:
Strong
Comments:
Z: dark brown, Y: brown, X: light brown

Chemical Properties of Oxo-magnesio-hastingsiteHide

Formula:
NaCa2(Mg2Fe3+3)(Al2Si6)O22O2

Oxo-magnesio-hastingsite is defined as an amphibole with
wO > 1 apfu
zTi<0.5 apfu and
A position: Na dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
IMA Formula:
NaCa2(Mg2Fe3+3)(Si6Al2)O22O2

Crystallography of Oxo-magnesio-hastingsiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 9.8837(3) Å, b = 18.0662(6) Å, c = 5.3107(2) Å
β = 105.278(1)°
Ratio:
a:b:c = 0.547 : 1 : 0.294
Unit Cell V:
914.77 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.383(62)
3.281(30)
2.708(97)
2.596(75)
2.555(100)
2.162(36)
1.585(39)
1.521(48)

Type Occurrence of Oxo-magnesio-hastingsiteHide

General Appearance of Type Material:
Oxo-magnesio-hastingsite occurs as megacrysts up to 12 cm in size. All samples are single crystals, rounded, do not show any crystal faces, and they are characterized by a smooth (‘‘melted’’) surface
Place of Conservation of Type Material:
Mineralogical Museum, Department of Mineralogy, St Petersburg State University, St Petersburg, Russia, catalogue number 1/19465
Geological Setting of Type Material:
The mineral occurs as megacrysts up to 12 cm in size in crystal-rich tuff
Associated Minerals at Type Locality:

Synonyms of Oxo-magnesio-hastingsiteHide

Relationship of Oxo-magnesio-hastingsite to other SpeciesHide

Other Members of this group:
Kaersutite Root Name{A}{Ca2}{Z2+3Z3+Ti}(Al2Si6O22)O2 Mon.
Mangani-dellaventuraite{Na}{Na2}{MgMn3+2LiTi4+}Si8O22O2Mon. 2/m : B2/m
Mangano-mangani-ungarettiiteNaNa2(Mn2+2Mn3+3)(Si8O22)O2Mon.
Obertiite Root Name{A}{Na2}{Z2+3Z3+Ti}{Si8O22}O2
Oxo-pargasiteNaCa2(Mg2Al3)(Al2Si6)O22O2
Potassic-mangano-mangani-ungarettiiteKNa2(Mn2+2Mn3+3)(Si8O22)O2

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Oxo-magnesio-hastingsiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zaitsev, A.N., Avdontseva, E.Y.,Britvin, S.N., Deme´ny, A., Homonnay, Z., Jeffries, T., Keller, J., Krivovichev, V.G., Markl, G., Platonova, N.V., Siidra, O.I., Spratt, J. (2011) Ferrikaersutite, IMA 2011-035. CNMNC Newsletter No. 10, October 2011: 2556.
Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031–2048.
Zaitsev, A.N., Avdontseva, E.Y., Britvin, S.N., Demény, A., Homonnay, Z., Jeffries, T.E., Keller, J., Krivovichev, V.G., Markl, G., Platonova, N.V., Siidra, O.I., Spratt, J., Vennemann, T. (2013) Oxo-magnesio-hastingsite, NaCa2(Mg2Fe3+3)(Al2Si6)O22O2, a new anhydrous amphibole from the Deeti volcanic cone, Gregory rift, northern Tanzania. Mineralogical Magazine: 77: 2773-2792.

Internet Links for Oxo-magnesio-hastingsiteHide

Localities for Oxo-magnesio-hastingsiteHide

ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Denmark
 
  • Greenland
    • Sermersooq
Kent Brooks, R.G Platt (1975): Kaersutite-bearing gabbroic inclusions and the late dike swarm of Kangerdlugssuaq, East Greenland. Mineralogical Magazine Vol 40 pp 259-283
Germany
 
  • Rhineland-Palatinate
    • Vulkaneifel
      • Daun
        • Brück
in the collection of Christof Schäfer
Tanzania (TL)
 
  • Arusha Region
Zaitsev A N, Avdontseva E Y, Britvin S N, Demény A, Homonnay Z, Jeffries T E, Keller J, Krivovichev V G, Markl G, Platonova N V, Siidra O I, Spratt J, Vennemann T (2013) Oxo-magnesio-hastingsite, NaCa2(Mg2Fe3+3)(Al2Si6)O22O2, a new anhydrous amphibole from the Deeti volcanic cone, Gregory rift, northern Tanzania. Mineralogical Magazine 77, 2773-2792
Mineral and/or Locality  
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