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Magnesio-ferri-fluoro-hornblende

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About Magnesio-ferri-fluoro-hornblendeHide

Formula:
☐{Ca2}{Mg4Fe3+}(AlSi7O22)F2
Defined as a an amphibole in the magnesio-hornblende group of the Calcium subgroup with Mg>Fe2+ and Fe3+>Al in the C position and with F as the dominant anion in the W position
Specific Gravity:
3.315 (Calculated)
Crystal System:
Monoclinic
Name:
according to composition
This page provides mineralogical data about Magnesio-ferri-fluoro-hornblende.


Classification of Magnesio-ferri-fluoro-hornblendeHide

Approved
Approval Year:
2014

Physical Properties of Magnesio-ferri-fluoro-hornblendeHide

Density:
3.315 g/cm3 (Calculated)
Comment:
Calculated from the empirical formula

Optical Data of Magnesio-ferri-fluoro-hornblendeHide

Type:
Biaxial (-)
RI values:
nα = 1.669 nβ = 1.676 nγ = 1.678
2V:
Measured: 74° (1), Calculated: 56°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
Pale grey (X), dark grey (Y), pale brownish grey (Z); X < Z < Y
Comments:
X^a = 47.6°, Y // b, Z^c = 33.4°

Chemical Properties of Magnesio-ferri-fluoro-hornblendeHide

Formula:
☐{Ca2}{Mg4Fe3+}(AlSi7O22)F2

Defined as a an amphibole in the magnesio-hornblende group of the Calcium subgroup with Mg>Fe2+ and Fe3+>Al in the C position and with F as the dominant anion in the W position
IMA Formula:
◻Ca2(Mg4Fe3+)(Si7Al)O22F2
Common Impurities:
Fe(II),OH,Cl

Crystallography of Magnesio-ferri-fluoro-hornblendeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 9.839(5) Å, b = 18.078(9) Å, c = 5.319(3) Å
β = 104.99(3)°
Ratio:
a:b:c = 0.544 : 1 : 0.294
Unit Cell V:
913.9 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.412(89)
3.389(55)
3.121(64)
2.738(34)
2.711(100)
2.599(45)
2.553(61)
2.164(36)

Type Occurrence of Magnesio-ferri-fluoro-hornblendeHide

General Appearance of Type Material:
Prismatic crystals in vugs
Place of Conservation of Type Material:
In the collections of the Mineralogical Museum of the Dipartimento di Scienze della Terra e dell’Ambiente, University of Pavia, sample number 2014-01
Geological Setting of Type Material:
Vugs in Seruci ignimbrites
Associated Minerals at Type Locality:

Synonyms of Magnesio-ferri-fluoro-hornblendeHide

Relationship of Magnesio-ferri-fluoro-hornblende to other SpeciesHide

Other Members of this group:
Ferro-ferri-fluoro-hornblende☐{Ca2}{Fe2+4Fe3+}(AlSi7O22)F2
Ferro-ferri-hornblende☐Ca2(Fe2+4Fe3+)(AlSi7O22)(OH)2Mon. 2/m : B2/m
Ferro-fluoro-hornblende☐Ca2(Fe2+4Al)(AlSi7O22)F2
Ferro-hornblende☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2Mon.
Magnesio-ferri-hornblende☐{Ca2}{Mg4Fe3+}(AlSi7O22)(OH)2Mon. 2/m : B2/m
Magnesio-fluoro-hornblende(Na,K)1-xCa2Mg5(Si7Al)O22F2
Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2Mon.

Fluorescence of Magnesio-ferri-fluoro-hornblendeHide

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 Magnesio-ferri-fluoro-hornblendeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A. Chiappino, L. (2015) Magnesio-ferri-fluoro-hornblende, IMA 2014-091. CNMNC Newsletter No. 24, April 2015, page 248; Mineralogical Magazine: 79: 247-251.
Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., Chiappino, L. (2016): Magnesio-ferri-fluoro-hornblende from Portoscuso, Sardinia, Italy: description of a newly approved member of the amphibole supergroup. Mineralogical Magazine, 80: 269-275

Internet Links for Magnesio-ferri-fluoro-hornblendeHide

Localities for Magnesio-ferri-fluoro-hornblendeHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Austria
 
  • Carinthia
    • Millstatt lake ridge
Gunnar Färber
Italy (TL)
 
  • Sardinia
    • Carbonia-Iglesias province
      • Portoscuso
Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., Chiappino, L. (2015): Magnesio-ferri-fluoro-hornblende, IMA 2014-091. CNMNC Newsletter No. 24, April 2015, page 248; Mineralogical Magazine, 79, 247-251; Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., Chiappino, L. (2016): Magnesio-ferri-fluoro-hornblende from Portoscuso, Sardinia, Italy: description of a newly approved member of the amphibole supergroup. Mineralogical Magazine, 80, 269-275.
Mineral and/or Locality  
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