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β-Roselite

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Formula:
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
System:TriclinicColour:Dark rose red, dark pink
Lustre:VitreousHardness:3½ - 4
Member of:Fairfieldite Group
Name:Named for the relation to roselite.
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
Simplified for copy/paste:Ca2(Co2+,Mg)(AsO4)2·2H2O
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:Fairfieldite Group
Other Members of Group:

- +
Cassidyite
Ca
 
2
(Ni
2+
 
,Mg)(PO
 
4
)
 
2
· 2H
 
2
O
Collinsite
Ca
 
2
(Mg,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
Gaitite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
Nickeltalmessite
Ca
 
2
Ni(AsO
 
4
)
 
2
· 2H
 
2
O
Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
Talmessite
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
Unnamed (Fe2+-analogue of Parabrandtite)
Ca
 
2
Fe
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
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(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(AsO
 
4
)(OH)
20.10.3Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
20.10.5Wendwilsonite
Ca
 
2
Mg(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
20.10.10Smolyaninovite
(Co,Ni,Mg,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(AsO
 
4
)
 
4
· 11H
 
2
O
20.10.11Nickelaustinite
Ca(Ni,Zn)(AsO
 
4
)(OH)

Other Names for β-Roselite

Synonyms:
Beta-RoseliteRoselite-βRoselite-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:
  • Look for β-Roselite on Google
  • Look for β-Roselite images on Google
  • External Links:
  • Look for β-Roselite on Webmineral
  • Look for β-Roselite on Athena Mineralogy
  • Look for β-Roselite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Roselite-beta details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Buy fine minerals and gemstones from Pala International
  • High-end worldwide specimens & outstanding customer service
  • Buy from Dave Bunk Minerals
  • Fine minerals from bisbeeborn.com
  • Top quality minerals from Kristalle of California
  • Fabre Minerals - search for β-Roselite specimens
  • Buy from McDougall Minerals
  • Buy minerals from YourMineralCollection
  • Find β-Roselite on www.crystalclassics.co.uk
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • β-Roselite specimens for sale - minfind.com
  • Buy from David K Joyce minerals
  • Specimens:The following β-Roselite specimens are currently listed for sale on minfind.com.

    Localities for β-Roselite

    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.
    Australia
     
    • Queensland
      • Mount Isa - Cloncurry area
        • Cloncurry district
          • Kajabbi railroad station
    S. Mills XRD data
    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
        • 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
      • Odenwald
        • Mühltal
          • Nieder-Beerbach
    Belendorff, K. (1986): Erze und Sekundärmineralien von Nieder-Beerbach/Odenwald. LAPIS 11 (10), 25-28 +58.
      • Richelsdorf District
        • Süss
          • Richelsdorf Smelter
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
    • Lower Saxony
      • Harz
        • Braunlage
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • North Rhine-Westphalia
      • Niederberg area
        • Velbert
    Schnorrer-Köhler, G. (1988): Der Niederbergische Erzbezirk des Werdener Bergreviers in Nordrhein-Westfalen. Lapis 13(1): 11-35
    • 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 Azer District (Bou Azzer District)
            • Aghbar
    Favreau, G., Dietrich, J. E., Meisser, N., Brugger, J., Ait Haddouch, L. & Maacha, L. (2007): Bou Azzer, Morocco. Mineralogical Record 38, 345-407
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Agoudal
    http://www.spiriferminerals.com/70,IV-2010---Morocco-part-II.html
            • Aït Ahmane
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Ambed
            • Bou Azer
    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
    Fabre mineral specimen & photo (analyzed)
            • 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 Region (Oshikoto)
      • Tsumeb
    Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany
    Mineral and/or Locality  
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