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Emmerichite

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About EmmerichiteHide

Franz-Joseph Emmerich
Formula:
Ba2Na(Na,Fe2+)2(Fe3+,Mg)Ti2(Si2O7)2O2F2
Colour:
brown
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.864 (Calculated)
Crystal System:
Monoclinic
Name:
Named by Nikita V. Chukanoc, et al. in 2013 in honor of Franz-Josef Emmerich (1940 - ), German amateur mineralogist and collector, for his contributions to the mineralogy of the Eifel region. He published the first compact disc with photos and data on Eifel minerals.
The first Fe3+-dominant titanium member of the lamprophyllite group.


Classification of EmmerichiteHide

Approved
Approval Year:
2013
First Published:
2014

Physical Properties of EmmerichiteHide

Vitreous
Transparency:
Transparent
Colour:
brown
Streak:
white
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {100}
Density:
3.864 g/cm3 (Calculated)

Optical Data of EmmerichiteHide

Type:
Biaxial (+)
RI values:
nα = 1.725(4) nβ = 1.728(4) nγ = 1.759(4)
2V:
Measured: 80° (5), Calculated: 79°
Max Birefringence:
δ = 0.034
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v, medium
Pleochroism:
Visible
Comments:
moderate: Z (brown) ≥ Y (light brown) > X (greenish gray).

Chemical Properties of EmmerichiteHide

Formula:
Ba2Na(Na,Fe2+)2(Fe3+,Mg)Ti2(Si2O7)2O2F2
IMA Formula:
Ba2Ti2Na3Fe3+(Si2O7)2O2F2

Crystallography of EmmerichiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 19.960(1) Å, b = 7.098(1) Å, c = 5.4074(3) Å
γ = 96.368(1)°
Ratio:
a:b:c = 2.812 : 1 : 0.762

Warning: deg2rad() expects parameter 1 to be float, string given in /home/mindat/www/include.php on line 9251
Unit Cell V:
0.00 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.97(55)
3.461(65)
3.312(40)
2.882(38)
2.792(100)
2.670(56)
2.629(42)
2.140(57)
Comments:
From Type Description.

Type Occurrence of EmmerichiteHide

General Appearance of Type Material:
Emmerichite forms lamellar (often plank-like) crystals up to 0.05 × 0.3 × 0.5 mm in size and clusters up to 1mm across.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4225/1.
Geological Setting of Type Material:
Alkaline basalts. high-temperature pneumatolitic
Associated Minerals at Type Locality:

Synonyms of EmmerichiteHide

Relationship of Emmerichite to other SpeciesHide

Other Members of this group:
Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)Mon.
Fluorbarytolamprophyllite(Ba,Sr)2[(Na,Fe2+)3(Ti,Mg)F2][Ti2(Si2O7)2O2]Mon. 2/m : B2/m
FluorlamprophylliteNa3(SrNa)Ti3(Si2O7)2O2F2Mon. 2/m : B2/m
Lamprophyllite(Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2Mon.
LileyiteBa2(Na,Fe,Ca)3MgTi2(Si2O7)2O2F2Mon. 2/m : B2/m
NabalamprophylliteNa3(Ba,Na)2Ti3(Si2O7)2O2(OH,F)2Mon. 2/m
SchülleriteBa2Na(Mn,Ca)(Fe3+,Mg,Fe2+)2Ti2(Si2O7)2(O,F)4Tric. 1 : P1

Common AssociatesHide

Associated Minerals Based on Photo Data:
Günterblassite4 photos of Emmerichite associated with Günterblassite on mindat.org.
Clinopyroxene Subgroup1 photo of Emmerichite associated with Clinopyroxene Subgroup on mindat.org.

Fluorescence of EmmerichiteHide

Shows no fluorescence in the UV wavelength range

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 EmmerichiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chukanov, N.V., Rastsvetaeva, R.K., Aksenov, S.M., Blass, G., Pekov, I.V., Belakovskiy, D.I., Tschörtner, J. (2013) Emmerichite, IMA 2013-064. CNMNC Newsletter No. 17, October 2013, page 3004; Mineralogical Magazine: 77: 2997-3005.
Aksenov, S.M., Rastsvetaeva, R.K., Chukanov, N.V. (2014) The crystal structure of emmerichite Ва 2Na 3Fe 3+ Ti 2 (Si 2O 7) 2O 2F 2, a new lamprophyllite-group mineral. Zeitschrift für Kristallographie–Crystalline Materials: 229(1): 1-7.
Chukanov, N.V., Rastsvetaeva, R.K., Aksenov, D.M., Blass, G., Pekov, I.V., Belakovskiy, D.I., Tschörtner, J., Schüller, W., Ternes, B. (2014) Emmerichite, Ва2Na(Na,Fe2+)2(Fe3+,Mg)Ti2(Si2O7)2O2F2, a new lamprophyllite-group mineral from the Eifel volcanic region, Germany. New Data on Minerals: 49: 5–13.

Internet Links for EmmerichiteHide

Localities for EmmerichiteHide

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.
Germany (TL)
 
  • Rhineland-Palatinate
    • Gerolstein
      • Roth
Chukanov, N.V., Rastsvetaeva, R.K., Aksenov, S.M., Blass, G., Pekov, I.V., Belakovskiy, D.I. and Tschörtner, J. (2013) Emmerichite, IMA 2013-064. CNMNC Newsletter No. 17, October 2013, page 3004; Mineralogical Magazine, 77, 2997-3005.
    • Hillesheim
Blaß, G. & Kruijen, F. (2014): Die Neuigkeiten aus der Vulkaneifel (2/14). Mineralien-Welt 25 (5), 62-75 (in German).
Mineral and/or Locality  
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