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β-Roselite

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Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco
© 2004 D. Schläfli

Show β-Roselite Photos (12)
Formula:
Ca
 
2
(Co
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
System:TriclinicColour:Dark rose red, dark pink
Lustre:VitreousHardness:3½ - 4
Name:Named for the relation to roselite.
Dimorph of:Roselite


Fairfieldite Group. Talmessite - β-Roselite Series. The triclinic dimorph of Roselite.

Classification of β-Roselite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/C.17-80

7 : Phosphates, Arsenates, Vanadates
C : Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg
17 : Collinsite - Wendwilsonite series
Dana 8th edition ID:40.2.2.7

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
Hey's CIM Ref.:20.10.4

20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni
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Type Occurrence of β-Roselite

Type Locality:Schneeberg District, Erzgebirge, Saxony, Germany

Physical Properties of β-Roselite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Dark rose red, dark pink
Streak:Red, pale
Hardness (Mohs):3½ - 4

Crystallography of β-Roselite

Crystal System:Triclinic
Cell Parameters:a = 5.88Å, b = 7.67Å, c = 5.58Å
α = 112.32°, β = 71.35°, γ = 119.68°
Ratio:a:b:c = 0.767 : 1 : 0.728
Unit Cell Volume:V 199.52 ų (Calculated from Unit Cell)

Optical Data of β-Roselite

Type:Biaxial (-)
RI values: nα = 1.723 nβ = 1.737 nγ = 1.756
Maximum Birefringence:δ = 0.033

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

Chemical Properties of β-Roselite

Formula:
Ca
 
2
(Co
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
Essential elements:As, Ca, Co, H, O
All elements listed in formula:As, Ca, Co, H, Mg, O
Common Impurities:Mg

Relationship of β-Roselite to other Species

Series:Forms a series with Talmessite (see here)
Member of Group:
Fairfieldite Group:
Related Minerals - Strunz Grouping):

- +
7/C.17-10Collinsite
Ca
 
2
(Mg,Fe
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-15Hillite
Ca
 
2
(Zn,Mg)[PO
 
4
]
 
2
 · 2 H
 
2
O
7/C.17-20Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-30Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-40Cassidyite
Ca
 
2
(Ni
2+
 
,Mg)[PO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-50Talmessite
Ca
 
2
Mg[AsO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-60Gaitite
Ca
 
2
Zn[AsO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-70Parabrandtite
Ca
 
2
Mn
2+
 
[AsO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-90Wendwilsonite
Ca
 
2
(Mg,Co
2+
 
)[AsO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-100Roselite
Ca
 
2
(Co
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-110Brandtite
Ca
 
2
(Mn
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
7/C.17-120Zincroselite
Ca
 
2
Zn[AsO
 
4
]
 
2
 · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.10.1Erythrite
Co
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
20.10.2Cobaltaustinite
CaCo[OH|AsO
 
4
]
20.10.3Roselite
Ca
 
2
(Co
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
20.10.5Wendwilsonite
Ca
 
2
(Mg,Co
2+
 
)[AsO
 
4
]
 
2
 · 2H
 
2
O
20.10.6Cobaltkoritnigite
(Co,Zn)[HAsO
 
4
] · H
 
2
O
20.10.7Aerugite
Ni
 
8.5
(AsO
 
4
)
 
2
As
5+
 
O
 
8
20.10.8Xanthiosite
Ni
 
3
[AsO
 
4
]
 
2
20.10.9Annabergite
Ni
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
20.10.10Smolianinovite
(Co,Ni,Mg,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(AsO
 
4
)
 
4
·11H
 
2
O
20.10.11Nickelaustinite
Ca(Ni,Zn)[OH|AsO
 
4
]

Other Names for β-Roselite

Synonyms:
Beta-RoseliteRoselite-beta
Other Languages:
German:β-Roselit
β-Roselith
Italian:β-Roselita

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 β-Roselite

Reference List:American Mineralogist (1954): 39: 828-833.

Frondel, C. (1955): Neomesselite and Beta-roselite: two new members of the fairfieldite group.- American Mineralogist 40, 828-833.

Bulletin de la Société française de Minéralogie et de Cristallographie (1964): 87: 169.

Joswig, W., Paulus, E. F., Liebscher, B. (2004): Crystal structure of dicalcium (cobalt,magnesium) diarsenate dihydrate, Ca2(Co0.532Mg0.468)[AsO4]2.2H2O, hydrogen bonding in talmessite. Z. Kristallogr. - New Cryst. Struct. 219, 341-342. [NOTE: Magnesium-rich material][NOTE: Use of name talmessite is an error!].

Internet Links for β-Roselite

Search Engines:
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  • Look for β-Roselite on Wikipedia
  • Look for β-Roselite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for β-Roselite in the Natural History Museum (London) online catalogue
  • Roselite-beta details from Handbook of Mineralogy (PDF)
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    Localities for β-Roselite

    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.
    Chile
     
    • Atacama Region
      • Chañaral province
        • El Salado
          • Diego de Almagro
            • Pampa Capitana
              • La Florida district
    		Ruiz Fuller C.-Peebles F.; "Yacimientos metalíferos de Chile", Fondecyt, Stgo 1988, Chile
    France
     
    • Languedoc-Roussillon
      • Aude
        • Narbonne
          • Tuchan
            • Padern
    		Favreau, G., Berbain, C. & Meisser, N. (2003): Cyanophyllite et autres minéraux rares de Padern (Aude). Le Cahiers des Micromonteurs, 82(4), 17-23.
    Germany
     
    • Hesse
      • North Hesse
        • Richelsdorf District
          • Süss
            • Richelsdorf Smelter
    		S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
      • Odenwald
        • Nieder-Ramstadt
          • Nieder-Beerbach
    		Belendorff, K. (1986): Erze und Sekundärmineralien von Nieder-Beerbach/Odenwald. LAPIS 11 (10), 25-28 +58.
    • Lower Saxony
      • Harz Mts
        • Braunlage
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • North Rhine-Westphalia
      • Niederberg area
        • Velbert
    		Lapis 1988(1), 14-33
    • Saxony
      • Erzgebirge
    		C. Frondel (1955): Neomesselite and Beta-roselite: two new members of the fairfieldite group.- Amer. Mineral. 40, 828-833
          • Neustädtel
    		Lapis 30(7/8):41-70 (2005)
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azzer District
            • Aghbar
    		No reference listed
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Aït Ahmane
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Ambed
            • Bou Azzer
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Ightem
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Méchoui
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Oumlil
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Tamdrost
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		No reference listed
    Mineral and/or Locality
    Google
     
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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: 16th Oct 2009 09:23:07