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β-Roselite

Big Photo

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

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)
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
)
 
3
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
German names:
β-Roselit
Italian names:
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:
  • Look for β-Roselite on Google
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    • External Links:
  • Look for β-Roselite on Webmineral
  • Look for β-Roselite on Athena Mineralogy
  • 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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  • Rare and Unusual minerals at Mineralogical Research Company
  • Find β-Roselite on www.crystalclassics.co.uk
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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.
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    (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
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