Günterblassite R141209

Name: Günterblassite
RRUFF ID: R141209
Ideal Chemistry: (K,Ca,Ba,Na,◻)3Fe[(Si,Al)13O25(OH,O)4]·7H2O
Locality: Rother Kopf, Gerolstein, Eifel, Germany
Source: Ch. and H. Schäfer [view label]
Owner: RRUFF
Description: White to colorless platy crystals, associated with dark brown hydrobiotite, quartz, and albite.
Status: The identification of this mineral has been confirmed only by single crystal X-ray diffraction.
Mineral Group: [ Gunterblassite (1) ]
POWDER DIFFRACTION 
RRUFF ID: R141209.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 6.5270(13)Å    b: 6.9734(14)Å    c: 37.3342(75)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 1699.28(83)Å3    Crystal System: orthorhombic
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REFERENCES for Günterblassite

American Mineralogist Crystal Structure Database Record: [view record]

Williams P A, Hatert F, Pasero M, Mills S J (2011) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 10. New minerals and nomenclature modifications approved in 2011, Mineralogical Magazine, 75, 2549-2561   [view file]

Chukanov N V, Rastsvetaeva R K, Aksenov S M, Pekov I V, Britvin S N, Belakovskiy D I, Schüller 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 (in Russian), Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva, 141, 71-79   [view file]

Chukanov N V, Rastsvetaeva R K, Aksenov S M, Pekov I V, Zubkova N V, Britvin S N, Belakovskiy D I, Schüller W, Ternes B (2012) Günterblassite, (K, Ca)3-xFe[(Si,Al)13O25(OH, O)4]·7H2o, a new mineral: The first phyllosillicate with triple tetrahedral layer, Geology of Ore Deposits, 54, 656-662   [view file]

Rastsvetaeva R K, Aksenov S M, Chukanov N V (2012) Crystal structure of günterblassite, a new mineral with a triple tetrahedral layer, Doklady Chemistry, 442, 57-62   [view file]