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Martinandresite

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About MartinandresiteHide

Formula:
Ba2(Al4Si12O32)·10H2O
Hardness:
Specific Gravity:
2.482
Crystal System:
Orthorhombic
Name:
Named in honor of Martin Andres (b. 1965), from Glis, Switzerland. He discovered the famous armenite locality of Wasenalp; the type locality of this mineral.
Chemically related to harmotome.


Classification of MartinandresiteHide

Approved
Approval Year:
2017
First Published:
2017

Physical Properties of MartinandresiteHide

Hardness:
4½ on Mohs scale
Cleavage:
Poor/Indistinct
Presumably on (010) and in a direction across (010).
Density:
2.482(5) g/cm3 (Measured)    2.495 g/cm3 (Calculated)
Comment:
Measured by floatation in heavy liquids

Optical Data of MartinandresiteHide

Type:
Biaxial (-)
RI values:
nα = 1.500(2) nβ = 1.512(2) nγ =
Warning: number_format() expects parameter 1 to be float, string given in /home/mindat/www/show_class.php on line 4030
(2)
2V:
Measured: 55° (10)
Max Birefringence:
δ = 1.500
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of MartinandresiteHide

Formula:
Ba2(Al4Si12O32)·10H2O
IMA Formula:
Ba2(Al4Si12O32) · 10H2O

Crystallography of MartinandresiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmmn
Setting:
Pmmn
Cell Parameters:
a = 9.4640(5) Å, b = 14.2288(6) Å, c = 6.9940(4) Å
Ratio:
a:b:c = 0.665 : 1 : 0.492
Unit Cell V:
941.82 ų
Z:
1
Morphology:
Blocky. Major form is {010}; the subordinate forms are {100} and {001}.
Twinning:
Cruciform twins

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.98(74)
6.26(83)
5.61(100)
3.933(60)
3.191(50)
3.170(62)
3.005(79)
2.816(49)
Comments:
From Type Description.

Type Occurrence of MartinandresiteHide

General Appearance of Type Material:
Tan-coloured blocky crystals up to 8 mm, aggregates up to 6 cm across, and cruciform twins up to 3.5 mm.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Geological Museum of Lausanne, Switzerland, catalogue number is MGL 093284
Associated Minerals at Type Locality:
Reference:
Chukanov, N.V., Zubkova, N.V., Meisser, N., Ansermet, S., Weiss, S., Pekov, I.V., Belakovskiy, D.I., Vozchikova, S.A., Britvin, S.N., Dmitry Yu. Pushcharovsky, D.Yu (2017) Martinandresite, Ba2(Al4Si12O32)·10H2O, a new zeolite from Wasenalp, Switzerland. Mineralogy and Petrology: 44: 511–521.

Synonyms of MartinandresiteHide

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 MartinandresiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chukanov, N.V., Zubkova, N.V., Meisser, N., Ansermet, S., Weiss, S., Pekov, I.V., Belakovskiy, D.I., Vozchikova, S.A., Britvin, S.N. and Pushcharovsky, D.Y. (2017) Martinandresite, IMA 2017-038. CNMNC Newsletter No. 38, August 2017, page 1038; Mineralogical Magazine: 81: 1033–1038.
Chukanov, N.V., Zubkova, N.V., Meisser, N., Ansermet, S., Weiss, S., Pekov, I.V., Belakovskiy, D.I., Vozchikova, S.A., Britvin, S.N., Dmitry Yu. Pushcharovsky, D.Yu (2017) Martinandresite, Ba2(Al4Si12O32)·10H2O, a new zeolite from Wasenalp, Switzerland. Mineralogy and Petrology: 44: 511–521.

Internet Links for MartinandresiteHide

Localities for MartinandresiteHide

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.
Switzerland (TL)
 
  • Wallis (Valais)
    • Brig
      • Simplon pass area
        • Ganter valley
          • Wasen Alp
Chukanov, N.V., Zubkova, N.V., Meisser, N., Ansermet, S., Weiss, S., Pekov, I.V., Belakovskiy, D.I., Vozchikova, S.A., Britvin, S.N. and Pushcharovsky, D.Y. (2017) Martinandresite, IMA 2017-038. CNMNC Newsletter No. 38, August 2017, page 1038; Mineralogical Magazine: 81: 1033–1038.
Mineral and/or Locality  
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