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Günterblassite

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Günter Blaß
Formula:
(K,Ca,Ba)2(Fe,Ca,Mg,Na)[(Si,Al)13O25(OH)4] · 7H2O ·
Also given as (K,Ca,Ba,Na◻)3Fe[(Si,Al)13O25(OH,O)4].7H2O
Colour:
colorless, white, pale yellow, or brown
Hardness:
4
Specific Gravity:
2.18
Crystal System:
Orthorhombic
Name:
Named after Günter Blaß, amateur mineralogist from Germany, who has studied minerals from the Eifel area in detail.
Related to umbrianite and hillesheimite.


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Classification of GünterblassiteHide

Approved
Approval Year:
2011

Physical Properties of GünterblassiteHide

Transparency:
Transparent
Colour:
colorless, white, pale yellow, or brown
Streak:
white
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
perfect cleavage is parallel to (001) and less perfect, to (100) and (010).
Density:
2.18(1) g/cm3 (Measured)    2.17 g/cm3 (Calculated)

Optical Data of GünterblassiteHide

Type:
Biaxial (+)
RI values:
nα = 1.488(2) nβ = 1.490(2) nγ = 1.493(2)
2V:
Measured: 80° (5), Calculated: 79°
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of GünterblassiteHide

Formula:
(K,Ca,Ba)2(Fe,Ca,Mg,Na)[(Si,Al)13O25(OH)4] · 7H2O ·

Also given as (K,Ca,Ba,Na◻)3Fe[(Si,Al)13O25(OH,O)4].7H2O
IMA Formula:
(K,Ca,Ba,Na,◻)3Fe[(Si,Al)13O25(OH,O)4] · 7H2O

Crystallography of GünterblassiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Cell Parameters:
a = 6.528(1) Å, b = 6.970(1) Å, c = 37.216(5) Å
Ratio:
a:b:c = 0.937 : 1 : 5.339
Unit Cell V:
1,693.33 ų (Calculated from Unit Cell)
Z:
2
Comment:
Pnm21

Type Occurrence of GünterblassiteHide

General Appearance of Type Material:
flattened from thin lamellar to tabular crystals up to 0.2 × 1 × 1.5 mm in size and their nea-rparallel or sheaf-shaped aggregates up to 3 mm across.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia with the registration number 4107/1.
Geological Setting of Type Material:
alkalai basalts
Associated Minerals at Type Locality:

Synonyms of GünterblassiteHide

Other Language Names for GünterblassiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Emmerichite4 photos of Günterblassite associated with Emmerichite on mindat.org.
Barytolamprophyllite2 photos of Günterblassite associated with Barytolamprophyllite on mindat.org.
Clinopyroxene Subgroup1 photo of Günterblassite associated with Clinopyroxene Subgroup on mindat.org.
Fluorapatite1 photo of Günterblassite associated with Fluorapatite on mindat.org.

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 GünterblassiteHide

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., Pekov, I.V., Zubkova, N.V., Britvin, S.N., Belakovskiy, D.I., Schueller, W., Ternes, B. (2012): Günterblassite, (K,Ca)3−xFe[(Si,Al)13O25(OH,O)4] • 7H2O, a new mineral: the first phyllosilicate with triple tetrahedral layer. Geology of Ore Deposits 54, 656-662.
Rastsvetaeva, R.K., Aksenova, S.M., Chukanov, N.V. (2012): Crystal structure of günterblassite, a new mineral with a triple tetrahedral layer. Doklady Chemistry, 442, 57-62.

Internet Links for GünterblassiteHide

Localities for GünterblassiteHide

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
    • Eifel
      • Gerolstein
        • Roth
Rastsvetaeva, R.K., Aksenova, S.M., Chukanov, N.V. (2012): Crystal structure of günterblassite, a new mineral with a triple tetrahedral layer. Doklady Chemistry, 442, 57-62; Chukanov, N.V., Rastsvetaeva, R.K., Aksenov, S.M., Pekov, I.V., Zubkova, N.V., Britvin, S.N., Belakovskiy, D.I., Schueller, W., Ternes, B. (2012): Günterblassite, (K,Ca)3−xFe[(Si,Al)13O25(OH,O)4] • 7H2O, a new mineral: the first phyllosilicate with triple tetrahedral layer. Geology of Ore Deposits 54, 656-662. ; Blaß, G. & Schüller, W. (2012): Der Rother Kopf in der Vulkaneifel. Lapis, 37 (3), 20-29.; 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.
      • Hillesheim
Marcus Voigt Collection
Mineral and/or Locality  
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