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Rösslerite

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Formula:
Mg(HAsO4) · 7H2O
System:
Monoclinic
Colour:
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

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
39.1.9.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
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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First Recorded Occurrence of Rösslerite

Associated Minerals at First Recorded Locality:

Occurrences of Rösslerite

Geological Setting:
Oxidized zones of arsenical ore bodies.

Physical Properties of Rösslerite

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:
1.943 g/cm3 (Measured)    1.948 g/cm3 (Calculated)
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 Data:
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
Max Birefringence:
δ = 0.388
Image 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(HAsO4) · 7H2O
Essential elements:
All elements listed in formula:

Relationship of Rösslerite to other Species

8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
8.CE.05GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
8.CE.10NewberyiteMg(HPO4) · 3H2O
8.CE.15BrassiteMg(HAsO4) · 4H2O
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2O
8.CE.25MetaswitzeriteMn3(PO4)2 · 4H2O
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2O
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 8-9H2O
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
8.CE.35BobierriteMg3(PO4)2 · 8H2O
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2O
8.CE.40ArupiteNi3(PO4)2 · 8H2O
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2O
8.CE.40ErythriteCo3(AsO4)2 · 8H2O
8.CE.40FerrisymplesiteFe33+(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2O
8.CE.40KöttigiteZn3(AsO4)2 · 8H2O
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
8.CE.40ParasymplesiteFe32+(AsO4)2 · 8H2O
8.CE.40VivianiteFe32+(PO4)2 · 8H2O
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2O
8.CE.45SymplesiteFe32+(AsO4)2 · 8H2O
8.CE.50CattiiteMg3(PO4)2 · 22H2O
8.CE.55KoninckiteFe3+PO4 · 3H2O
8.CE.60KaňkiteFeAsO4 · 3.5H2O
8.CE.65SteigeriteAl(VO4) · 3H2O
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2O
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2O
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2O
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2O
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2O
8.CE.80SantabarbaraiteFe33+(PO4)2(OH)3 · 5H2O
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
20.2.1BearsiteBe2(AsO4)(OH) · 4H2O
20.2.2BrassiteMg(HAsO4) · 4H2O
20.2.4HörnesiteMg3(AsO4)2 · 8H2O
20.2.5WeiliteCa(HAsO4)
20.2.6JohnbaumiteCa5(AsO4)3OH
20.2.7HaidingeriteCaHAsO4 · H2O
20.2.8PharmacoliteCa(HAsO4) · 2H2O
20.2.9SainfelditeCaCa2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.2.10VladimiriteCa4(AsO4)2(AsO3OH) · 4H2O
20.2.11GuériniteCa5(AsO4)2(HAsO4)2 · 9H2O
20.2.12FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2O
20.2.13RauenthaliteCa3(AsO4)2 · 10H2O
20.2.14PhaunouxiteCa3(AsO4)2 · 11H2O
20.2.15McneariteNaCa5(AsO4)(HAsO4)4 · 4H2O
20.2.16BergslagiteCaBeAsO4(OH)
20.2.17AdeliteCaMg(AsO4)(OH)
20.2.18TalmessiteCa2Mg(AsO4)2 · 2H2O
20.2.19IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2O
20.2.20CamgasiteCaMg(AsO4)(OH) · 5H2O
20.2.21PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
20.2.22BariopharmacosideriteBa0.5Fe43+(AsO4)3(OH)4 · 5H2O

Other Names for Rösslerite

Name in Other Languages:

Other Information

Other Information:
Readily soluble in dilute HCl; slightly soluble in water.
Health Risks:
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

Localities for Rösslerite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
      • Toquima Range
        • Manhattan District
          • Manhattan
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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