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Rösslerite

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Formula:
Mg(HAsO
 
4
) · 7H
 
2
O
System:MonoclinicColour:Colorless to white, ...
Hardness:2 - 3
Name:Named by Johann Reinhard Blum in 1861 after Dr. Karl Rössler of Hanau, Germany, who found the first specimen.


Dehydrates in air to brassite.

Classification of Rösslerite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/C.15-30
Nickel-Strunz 10th (pending) edition ID:8.CE.20

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
Dana 8th edition ID:39.1.9.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
Hey's CIM Ref.:20.2.3

20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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Type Occurrence of Rösslerite

Type Locality:"Im Lochborn" Copper mine, Bieber, Gelnhausen, Spessart, Hesse, Germany
Associated Minerals at type locality:
PharmacoliteErythrite

Occurrences of Rösslerite

Geological Setting:Oxidized zones of arsenical ore bodies.

Physical Properties of Rösslerite

Lustre:Vitreous, Dull
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colorless to white, faint tints; colorless in transmitted light.
Streak:White
Hardness (Mohs):2 - 3
Tenacity:Brittle
Cleavage:Poor/Indistinct
On {111}, poor.
Density (measured):1.943 g/cm3
Density (calculated):1.948 g/cm3
Comment:Measured value is on artificial material.

Crystallography of Rösslerite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b
Space Group Setting:C2/c
Cell Parameters:a = 6.692Å, b = 25.744Å, c = 11.538Å
β = 95.15°
Ratio:a:b:c = 0.26 : 1 : 0.448
Unit Cell Volume:V 1,979.73 ų (Calculated from Unit Cell)
Z:8
Morphology:Well-formed crystals rare, small, short prismatic [001]. Fine-grained crusts; hair-like at times. Artificial crystals are tabular {010}.
Comment:Zeit. Krist. 137:194 (1973) structure
X-Ray Powder Diffraction:
d-spacingIntensity
12.9 (60)
6.43 (90)
4.67 (80)
4.49 (90)
4.29 (80)
4.08 (10)
3.31 (50)
2.86 (60)
Comments:ICDD 26-1447 (synthetic)

Optical Data of Rösslerite

Type:Biaxial (+)
RI values: nα = 1.488 nβ = 1.507 nγ = 1.100
2V:Measured: 28°
Birefringence:0.022
Maximum Birefringence:δ = 0.388

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:r > v
Optical Extinction:Inclined. Previously measured optics were apparently made on the wrong species or on material that was a more hydrated material.
Pleochroism:Non-pleochroic

Chemical Properties of Rösslerite

Formula:
Mg(HAsO
 
4
) · 7H
 
2
O
Simplified for copy/paste:Mg(HAsO4)·7H2O
Essential elements:As, H, Mg, O
All elements listed in formula:As, H, Mg, O

Relationship of Rösslerite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CE.05Chudobaite
(Mg,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.05Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.10Newberyite
Mg(HPO
 
4
) · 3H
 
2
O
8.CE.15Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
8.CE.20Phosphorrösslerite
Mg(HPO
 
4
) · 7H
 
2
O
8.CE.25Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.25Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
· 7H
 
2
O
8.CE.30Lindackerite
CuCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 8-9H
 
2
O
8.CE.30Ondrušite
CaCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.30Veselovskýite
ZnCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
8.CE.30Pradetite
CoCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
8.CE.30Klajite
MnCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9-10H
 
2
O
8.CE.35Bobierrite
Mg
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Annabergite
Ni
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Arupite
Ni
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Erythrite
Co
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Ferrisymplesite
Fe
3+
3
(AsO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
8.CE.40Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Köttigite
Zn
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Vivianite
Fe
2+
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Pakhomovskyite
Co
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.45Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.50Cattiite
Mg
 
3
(PO
 
4
)
 
2
· 22H
 
2
O
8.CE.55Koninckite
Fe
3+
 
PO
 
4
· 3H
 
2
O
8.CE.60Kaňkite
FeAsO
 
4
· 3.5H
 
2
O
8.CE.65Steigerite
Al(VO
 
4
) · 3H
 
2
O
8.CE.70Metaschoderite
Al
 
2
(PO
 
4
)(VO
 
4
) · 6H
 
2
O
8.CE.70Schoderite
Al
 
2
(PO
 
4
)(VO
 
4
) · 8H
 
2
O
8.CE.75Malhmoodite
FeZr(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.75Zigrasite
MgZr(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.75Unnamed (Ca-analogue of Zigrasite)
CaZr[PO
 
4
]
 
2
· 4H
 
2
O
8.CE.80Santabarbaraite
Fe
3+
3
(PO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
8.CE.85Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
· 8(H
 
2
O,OH)
Related Minerals - Hey's Index Grouping:

- +
20.2.1Bearsite
Be
 
2
(AsO
 
4
)(OH) · 4H
 
2
O
20.2.2Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
20.2.4Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
20.2.5Weilite
Ca(HAsO
 
4
)
20.2.6Johnbaumite
Ca
 
5
(AsO
 
4
)
 
3
OH
20.2.7Haidingerite
CaHAsO
 
4
· H
 
2
O
20.2.8Pharmacolite
Ca(HAsO
 
4
) · 2H
 
2
O
20.2.9Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
20.2.10Vladimirite
Ca
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH) · 4H
 
2
O
20.2.11Guérinite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
20.2.12Ferrarisite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
20.2.13Rauenthalite
Ca
 
3
(AsO
 
4
)
 
2
· 10H
 
2
O
20.2.14Phaunouxite
Ca
 
3
(AsO
 
4
)
 
2
· 11H
 
2
O
20.2.15Mcnearite
NaCa
 
5
(AsO
 
4
)(HAsO
 
4
)
 
4
· 4H
 
2
O
20.2.16Bergslagite
CaBeAsO
 
4
(OH)
20.2.17Adelite
CaMg(AsO
 
4
)(OH)
20.2.18Talmessite
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
20.2.19Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
20.2.20Camgasite
CaMg(AsO
 
4
)(OH) · 5H
 
2
O
20.2.21Picropharmacolite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 11H
 
2
O
20.2.22Bariopharmacosiderite
Ba
 
0.5
Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
· 5H
 
2
O

Other Names for Rösslerite

Synonyms:
Roesslerite
Other Languages:
German:Rösslerit
Russian:Ресслерит
Spanish:Rösslerita
Varieties:
Wapplerite

Other Information

Fluorescence in UV light:Not fluorescent.
Other Information:Readily soluble in dilute HCl; slightly soluble in water.
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 Rösslerite

Reference List:

- +
Blum (1861) Wetterauische Gesellschaft für die Gesammte Naturkunde zu Hanau. Jahresbericht. Naturhistorische Abhandlungen: 32.

Tschermak (1867) Konigliche Akademie der Wissenschaften, Vienna, Ber.: 56: 824

Haushofer (1882) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 7: 259 (artif. crystals).

de Schulten (1903) Bulletin de la Société française de Minéralogie: 26: 95, 99.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 156.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 712-713.
Zeit. Krist. 137:194 (1973) structure.
Acta Crystallographica (1973): B29: 286-292, structure.

Internet Links for Rösslerite

Search Engines:
  • Look for Rösslerite on Google
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  • External Links:
  • Look for Rösslerite on Webmineral
  • Look for Rösslerite on Athena Mineralogy
  • Look for Rösslerite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Rösslerite details from Handbook of Mineralogy (PDF)
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  • Localities for Rösslerite

    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
     
    • Carinthia
      • Friesach - Hüttenberg area
        • Hüttenberg
          • Lölling
            • Stelzing
    M. Puttner: Mineralogische Rundschau von Dr. Exel 4:8-10 (1995)
    Canada
     
    • Northwest Territories
      • Mackenzie District
        • Great Bear Lake
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov District (St Joachimsthal)
    Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 712; Lapis 2002(7/8), 63-65.
    France
     
    • Alsace
      • Haut-Rhin
        • Ste Marie-aux-Mines (Markirch)
          • Neuenberg
    Wittern, Journée: "Mineralien finden in den Vogesen", von Loga (Cologne), 1997
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Alpirsbach
    [var: Wapplerite] K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
        • Schenkenzell
          • Wittichen
            • Böckelsbach valley
    Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992.Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 712;
            • Heubach Valley
    Handbook for Mineralogy, v. 4
    • Hesse
      • Richelsdorf District
        • Süss
          • Richelsdorf Smelter
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
      • Spessart
        • Gelnhausen
          • Bieber
    Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 712.
    • Lower Saxony
      • Harz
        • St Andreasberg District
          • St Andreasberg
    No reference listed
    • Saxony
      • Erzgebirge
        • Schlema-Hartenstein District
          • Alberoda
    Vollstädt,H. & Weiß,St. (1991): Mineralfundstellen Sächsisches Erzgebirge, München, S.26ff.
    No reference listed
    [var: Wapplerite] Lapis 30(7/8):41-70 (2005)
          • Neustädtel
    [var: Wapplerite] Lapis 30(7/8):41-70 (2005)
    [var: Wapplerite] Lapis 30(7/8):41-70 (2005)
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Plaka
            • Plaka Mines
    No reference listed
    Russia
     
    • Northern Caucasus Region
      • Adygea Republic (Adygeya)
    Pekov I.V. et al. (2010) Mineralogy of Belorechenskoe deposit (Northern Caucasus, Russia). Mineralogical Almanakh, 15(2).
    Switzerland
     
    • Wallis (Valais)
      • Turtmann Valley
        • Blüomatttälli
    Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 352; Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer)
    USA
     
    • Nevada
      • Nye Co.
        • Manhattan District
          • Manhattan
    NBMG Spec. Pub. 31 Minerals of Nevada
    Mineral and/or Locality  
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