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Bearthite

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About BearthiteHide

Peter Bearth
Formula:
Ca2Al(PO4)2(OH)
Colour:
pale yellow
Hardness:
4 - 5
Specific Gravity:
3.25 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Peter Bearth (30 August 1902, Sumvitg, Switzerland - 24 August 1989, Basel, Switzerland) in recognition of his pioneering petrographic work on the high-pressure terranes of the western Alps. He mapped 1100 km2 of alpine and high alpine terrain in Oberwald. He was simultaneously a high school teacher and a professor of Petrography at the University of Basel.

Classification of BearthiteHide

Approved
Approval Year:
1986
First Published:
1993
8.BG.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
41.10.4.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
10 : (AB)3(XO4)2Zq

Physical Properties of BearthiteHide

Transparency:
Transparent
Colour:
pale yellow
Streak:
white
Hardness:
4 - 5 on Mohs scale
Fracture:
Irregular/Uneven
Density:
3.25 g/cm3 (Calculated)

Optical Data of BearthiteHide

Type:
Biaxial (+)
RI values:
nα = 1.662 nβ = 1.671 nγ = 1.696
2V:
Measured: 65° , Calculated: 64°
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:
weak

Chemical Properties of BearthiteHide

Formula:
Ca2Al(PO4)2(OH)
Common Impurities:
Sr,Mg,Fe,Ce,La,Si,F,Cl,Nd

Crystallography of BearthiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 7.23 Å, b = 5.73 Å, c = 8.26 Å
β = 112.57°
Ratio:
a:b:c = 1.262 : 1 : 1.442
Unit Cell V:
315.99 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.05 (100)
2.867 (61)
2.568 (39)
2.754 (27)
4.58 (22)
2.634 (21)
2.444 (19)
Comments:
calculated due to poor Gandolphi pattern

Type Occurrence of BearthiteHide

Place of Conservation of Type Material:
Mineralogic-Petrographic Institute, University of Basel, Basel, Switzerland; PB100f
National School of Mines, Paris, France; 84DM54, 85DM45, 85DM70
National History Museum, Paris, France
Reference:
Chopin, C., Brunet, F., Gebert, W., Medenbach, O., Tillmanns, E. (1993) Bearthite, Ca2Al[PO4]2(OH), a new mineral from high-pressure terranes of the western Alps. Schweizerische Mineralogische und Petrographische Mitteilungen: 73: 1-9.

Synonyms of BearthiteHide

Other Language Names for BearthiteHide

German:Bearthit
Spanish:Bearthita

Relationship of Bearthite to other SpeciesHide

Other Members of this group:
ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)Mon. 2/m : P2/m
ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
BushmakinitePb2Al(PO4)(VO4)(OH)Mon. 2/m : P21/m
CalderónitePb2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
CanosioiteBa2Fe3+(AsO4)2(OH)Mon. 2/m : P21/m
FeinglositePb2Zn(AsO4)2 · H2OMon. 2/m
FerribushmakinitePb2Fe3+(PO4)(VO4)(OH)Mon. 2/m : P21/m
GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
GoedkeniteSr2Al(PO4)2(OH)Mon. 2/m : P21/m
GrandaiteSr2Al(AsO4)2(OH)Mon. 2/m : P21/m
LombardoiteBa2Mn3+(AsO4)2(OH)Mon. 2/m : P21/m
TokyoiteBa2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
Unnamed (possible ordered As-analogue of Tokyoite)Ba2Mn[(As,V)O4]2(OH)Mon. 2/m : P21/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Lazulite3 photos of Bearthite associated with Lazulite on mindat.org.
Quartz2 photos of Bearthite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BG.CanosioiteBa2Fe3+(AsO4)2(OH)Mon. 2/m : P21/m
8.BG.05ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
8.BG.05BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05GoedkeniteSr2Al(PO4)2(OH)Mon. 2/m : P21/m
8.BG.05UM1994-19-PO:CuHMoPbPb2Cu(PO4)(MoO4,AsO4,CrO4,GaO4)(OH)
8.BG.05TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
8.BG.05ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)Mon. 2/m : P2/m
8.BG.05FeinglositePb2Zn(AsO4)2 · H2OMon. 2/m
8.BG.05BushmakinitePb2Al(PO4)(VO4)(OH)Mon. 2/m : P21/m
8.BG.05TokyoiteBa2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05CalderónitePb2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.10MélonjosephiteCaFe2+Fe3+(PO4)2(OH)
8.BG.15TancoiteLiNa2Al(PO4)(HPO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Dana Grouping (8th Ed.)Hide

41.10.4.1GoedkeniteSr2Al(PO4)2(OH)Mon. 2/m : P21/m
41.10.4.3GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m

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 BearthiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chopin, C., Brunet, F., Gebert, W., Medenbach, O., Tillmanns, E. (1993) Bearthite, Ca2Al[PO4]2(OH), a new mineral from high-pressure terranes of the western Alps. Schweizerische Mineralogische und Petrographische Mitteilungen: 73: 1-9.
American Mineralogist (1993) 78: 1314 (abstract).
Brunet, F., C. Chopin (1995) Contr. Mineral. Petrol.: 121: 258-266.
New Minerals (1997) New Minerals 1990-1994.

Internet Links for BearthiteHide

Localities for BearthiteHide

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
 
  • Styria
    • Fischbacher Alpen
      • Krieglach
        • Freßnitzgraben
          • Alpl
SEM-EDS and XRD on sample AN1267 (HK022) by Franz Bernhard, 2007
Bernhard, F. (1998): Paragenetische, mineralchemische und röntgenographische Daten von Bearthit vom Lazulithfundpunkt am Rotriegel, Freßnitzgraben bei Krieglach, Fischbacher Alpen, Steiermark. Mitteilungen der Abteilung für Mineralogie am Landesmuseum Joanneum, 62/63, 49-54.
      • Mürzzuschlag
        • Hönigsberg
Bernhard, F. (2006)
Italy
 
  • Piedmont
    • Cuneo Province
[MinRec 27:303]
Chopin C, Brunet F, Gebert W, Medenbach O, Tillmanns E (1993): Bearthite, Ca2Al[PO4]2(OH), a new mineral from high-pressure terranes of the western Alps. Schweizerische Mineralogische und Petrographische Mitteilungen 73, 1-9.
        • Martiniana Po
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
      • Varaita Valley
        • Brossasco
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.; Chopin C, Brunet F, Gebert W, Medenbach O, Tillmanns E (1993): Bearthite, Ca2Al[PO4]2(OH), a new mineral from high-pressure terranes of the western Alps. Schweizerische Mineralogische und Petrographische Mitteilungen 73, 1-9.
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Bolzano Province (South Tyrol)
      • Vizze Valley (Pfitsch Valley)
        • San Giacomo (Sankt Jakob)
Morteani, G. & Ackermand, D. (1996): Aluminium phosphates in muscovite-kyanite metaquartzites from Passo di Vizze (Alto Adige, NE Italy). European Journal of Mineralogy, 8, 853-869.
Folie, K., P. Gentile, M. Hanke & I. Rocchetti (2010): Mineralien aus der Umgebung des Pfitscher Jochs in Südtirol (II). Mineralien-Welt 21 (4), 42-67.
Sweden
 
  • Skåne
    • Bromölla
      • Näsum
Sandstöm, F. (2007): Västanåfeltets geologi och mineralogi. Litiofilen 24 (2): 14-38
Switzerland (TL)
 
  • Wallis (Valais)
    • Zermatt - Saas Fee area
      • Matt Valley
        • Zermatt
          • Gorner glacier area
            • Stockhorn
SMPM 73 (1993), 1; NM 90-94 (1997); HB4 (2000)
Mineral and/or Locality  
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