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Bearthite

Big Photo

Rotriegel ridge, Freßnitzgraben, Krieglach, Fischbacher Alpen Mts, Styria, Austria
© Franz Bernhard

Show Bearthite Photos (3)
Formula:
Ca
 
2
Al[OH|(PO
 
4
)
 
2
]
System:MonoclinicColour:pale yellow
Hardness:4 - 5
Name:Honors Prof. Peter Bearth (1902-1989)


Brackebuschite Group.

Classification of Bearthite

IMA status:Approved 1986
Strunz 8th edition ID:7/B.24-05
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.10.4.2

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

Type Locality:Metapelite outcrops, Stockhorn Mt., Gorner glacier area, Zermatt, Matt Valley, Zermatt - Saas Fee area, Wallis (Valais), Switzerland
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
Year of Discovery:1993

Physical Properties of Bearthite

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

Crystallography of Bearthite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Cell Parameters:a = 7.23Å, b = 5.73Å, c = 8.26Å
β = 112.57°
Ratio:a:b:c = 1.262 : 1 : 1.442
Unit Cell Volume:V 315.99 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
3.05 (100)
2.867 (61)
2.568 (39)
2.754 (27)
4.58 (22)
2.634 (21)
Comments:calculated due to poor Gandolphi pattern

Optical Data of Bearthite

Type:Biaxial (+)
RI values: nα = 1.662 nβ = 1.671 nγ = 1.696
2V:Measured: 65° , Calculated: 64°
Maximum Birefringence:δ = 0.034

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:weak

Chemical Properties of Bearthite

Formula:
Ca
 
2
Al[OH|(PO
 
4
)
 
2
]
Essential elements:Al, Ca, H, O, P
All elements listed in formula:Al, Ca, H, O, P
Common Impurities:Sr,Mg,Fe,Ce,La,Si,F,Cl,Nd

Relationship of Bearthite to other Species

Member of Group:
Brackebuschite Group:
M
2+
2
M
3+
 
[OH|(TO
 
4
)
 
2
]
Related Minerals - Nickel-Strunz Grouping):

- +
8.BG.05Arsentsumebite
Pb
 
2
Cu[OH|SO
 
4
|AsO
 
4
]
8.BG.05Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Goedkenite
(Sr,Ca)
 
2
Al[OH|(PO
 
4
)
 
2
]
8.BG.05UM1994-19-PO:CuHMoPb
Pb
 
2
CuOHPO
 
4
(Mo,As,Cr,Ga)O
 
4
8.BG.05Tsumebite
Pb
 
2
Cu[OH|SO
 
4
|PO
 
4
]
8.BG.05Arsenbrackebuschite
Pb
 
2
(Fe
3+
 
,Zn
2+
 
)[(OH,H
 
2
O)|(AsO
 
4
)
 
2
]
8.BG.05Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)[OH|SO
 
4
|AsO
 
4
]
8.BG.05Bushmakinite
Pb
 
2
Al[OH|PO
 
4
|VO
 
4
]
8.BG.05Tokyoite
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Calderónite
Pb
 
2
Fe
3+
 
[OH|(VO
 
4
)
 
2
]
8.BG.10Mélonjosephite
CaFe
2+
 
Fe
3+
 
[OH|(PO
 
4
)
 
2
]
8.BG.15Tancoite
LiNa
 
2
Al[OH|HPO
 
4
|PO
 
4
]

Other Names for Bearthite

Synonyms:
IMA1986-050
Other Languages:
German:Bearthit
Russian:Беартит
Spanish:Bearthita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Bearthite

Reference List:Chopin et al. (1993): 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 Bearthite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Bearthite in the Natural History Museum (London) online catalogue
  • Bearthite details from Handbook of Mineralogy (PDF)
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    Localities for Bearthite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Styria
      • Fischbacher Alpen Mts
        • 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]
          • Po Valley
            • 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.
    • Trentino-Alto Adige
      • Bolzano Province (South Tyrol)
        • Vizze Valley (Pfitsch Valley)
          • San Giacomo
    		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.
    Sweden
     
    • Skåne
      • Bromölla
        • Näsum
    		Sandstöm, F. (2007): Västanåfeltets geologi och mineralogi. Litiofilen 24 (2): 14-38
    Switzerland
     
    • Wallis (Valais)
      • Zermatt - Saas Fee area
        • Matt Valley
          • Zermatt
            • Gorner glacier area
              • Stockhorn Mt.
    		SMPM 73 (1993), 1; NM 90-94 (1997); HB4 (2000)
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 31st Oct 2009 07:18:37