Rösslerite
A valid IMA mineral species - grandfathered
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About Rösslerite
Karl Rößler
Formula:
Mg(HAsO4) · 7H2O
Colour:
Colorless to white, faint tints; colorless in transmitted light.
Lustre:
Vitreous, Dull
Hardness:
2 - 3
Specific Gravity:
1.943
Crystal System:
Monoclinic
Name:
Named by Johann Reinhard Blum in 1861 after Dr. Karl Rößler (6 May 1788, Wiesbaden, Germany - 23 August 1863, Hanau, Germany) (also appears as Carl Rössler or Roessler), manufacturer, mineralogist, and naturalist. He found the first specimens of the mineral. Although Rößler is the proper German spelling for the family name, the IMA approved species name is rösslerite (Burke 2008).
Unique Identifiers
Mindat ID:
3470
Long-form identifier:
mindat:1:1:3470:4
GUID
(UUID V4):
(UUID V4):
1e406822-927c-496a-81c6-5fdf1bb825fe
IMA Classification of Rösslerite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mg(AsO3OH) · 7H2O
First published:
1861
Classification of Rösslerite
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
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
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
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Rö | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Rösslerite
Vitreous, Dull
Transparency:
Transparent, Translucent
Colour:
Colorless to white, faint tints; colorless in transmitted light.
Streak:
White
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
On {111}, poor.
On {111}, poor.
Density:
1.943 g/cm3 (Measured) 1.948 g/cm3 (Calculated)
Comment:
Measured value is on artificial material.
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.
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
Chemistry of Rösslerite
Mindat Formula:
Mg(HAsO4) · 7H2O
Elements listed:
Crystallography of Rösslerite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 6.692 Å, b = 25.744 Å, c = 11.538 Å
β = 95.15°
β = 95.15°
Ratio:
a:b:c = 0.26 : 1 : 0.448
Unit Cell 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
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.9 Å | (60) |
| 6.43 Å | (90) |
| 4.67 Å | (80) |
| 4.49 Å | (90) |
| 4.29 Å | (80) |
| 4.08 Å | (10) |
| 3.31 Å | (50) |
| 2.86 Å | (60) |
Comments:
ICDD 26-1447 (synthetic)
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Geological Setting:
Oxidized zones of arsenical ore bodies.
Type Occurrence of Rösslerite
Place of Conservation of Type Material:
No designated type material.
Associated Minerals at Type Locality:
Reference:
Blum, R. (1861) Rösslerit, ein neues Mineral. Jahresbericht der Wetterauischen Gesellschaft für die Gesammte Naturkunde zu Hanau, Naturhistorische Abhandlungen: 1861: 32-36.
Synonyms of Rösslerite
Other Language Names for Rösslerite
Varieties of Rösslerite
| Wapplerite | A calcium-rich variety of Rößlerite. Possibly a mixture. Originally reported from Jáchymov (St Joachimsthal), Ostrov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic. |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O |
| 8.CE. | Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O |
| 8.CE.05 | Chudobaite | (Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.10 | Newberyite | Mg(PO3OH) · 3H2O |
| 8.CE.15 | Brassite | Mg(HAsO4) · 4H2O |
| 8.CE.20 | Phosphorrösslerite | Mg(PO3OH) · 7H2O |
| 8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
| 8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O |
| 8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O |
| 8.CE.30 | Hloušekite | (Ni,Co)Cu4(AsO4)2(AsO3OH)2 · 9H2O |
| 8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O |
| 8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O |
| 8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O |
| 8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O |
| 8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O |
| 8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O |
| 8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O |
| 8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O |
| 8.CE.40 | Manganohörnesite | Mn2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
| 8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O |
| 8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O |
| 8.CE.55 | Koninckite | Fe3+PO4 · 3H2O |
| 8.CE.60 | Kaňkite | FeAsO4 · 3.5H2O |
| 8.CE.60 | Hilarionite | Fe3+2(SO4)(AsO4)(OH) · 6H2O |
| 8.CE.65 | Steigerite | Al(VO4) · 3H2O |
| 8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O |
| 8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O |
| 8.CE.75 | Malhmoodite | FeZr(PO4)2 · 4H2O |
| 8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O |
| 8.CE.75 | UM2009-11-PO:CaHZr | CaZr[PO4]2 · 4H2O |
| 8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O |
| 8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) |
| 8.CE.90 | Slavkovite | Cu13(AsO4)6(AsO3OH)4 · 23H2O |
Fluorescence of Rösslerite
Not fluorescent.
Other Information
Notes:
Readily soluble in dilute HCl; slightly soluble in water. Dehydrates in air to brassite.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Rösslerite
mindat.org URL:
https://www.mindat.org/min-3470.html
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References for Rösslerite
Reference List:
Larsen, Esper S. (1921) The microscopic determination of the nonopaque minerals. Bulletin Vol. 679. US Geological Survey doi:10.3133/b679 p.156
Ferraris, G., Franchini-Angela, M. (1973) Hydrogen bonding in the crystalline state. Crystal structure of MgHAsO4·7H2O, roesslerite. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 29 (2) 286-292 doi:10.1107/s0567740873002360
Localities for Rösslerite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Austria | |
| M. Puttner: Mineralogische Rundschau von Dr. Exel 4:8-10 (1995) |
Canada | |
| |
Czech Republic | |
| Lapis 2002 (7/8) +1 other reference |
| Majzlan et al. (2021) | |
France | |
| P&T N°23-24 et al. (Haut-Rhin) |
| Wittern +1 other reference |
| This mine worked the same vein as Gabe ... +2 other references | |
Germany | |
| Palache et al. (1951) |
| Handbook for Mineralogy |
| [var: Wapplerite] Walenta (1992) |
| Palache et al. (1951) |
| Weiß (1990) |
| |
| Möhn et al. (10/2020) |
| Neschen (n.d.) |
| Vollstädt et al. (1991) | |
| Lapis 30 (7/8) |
| Lapis 30 (7/8) | |
| Lapis 30 (7/8) |
Greece | |
| Rieck et al. (1999) |
Russia | |
| Pekov I.V. et al. (2010) |
Spain | |
| Rewitzer et al. (part 2) |
Switzerland | |
| Stalder et al. (1998) +1 other reference |
USA | |
| Castor et al. (2004) |
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Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic