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Brassite

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About BrassiteHide

Formula:
Mg(HAsO4) · 4H2O
Colour:
White
Lustre:
Waxy, Silky, Dull, Earthy
Specific Gravity:
2.28 - 2.33
Crystal System:
Orthorhombic
Name:
Named by François Fontan, Marcel Orliac, François Permingeat, Roland Pierrot, and Réjane Stahl in 1973 for Réjane Brasse, apparently the maiden name of Réjane Stahl, French chemist of Universite de Paris Sud, who first synthesized the compound.
May occur also as a dehydration product of rösslerite.


Classification of BrassiteHide

Approved
8.CE.15

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
39.1.7.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
20.2.2

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

Physical Properties of BrassiteHide

Waxy, Silky, Dull, Earthy
Transparency:
Translucent
Comment:
May have a fine satin-like appearance.
Colour:
White
Streak:
White
Comment:
Soft fine-grained mineral. True hardness unknown.
Tenacity:
Brittle
Cleavage:
Perfect
{001} perfect.
Fracture:
Irregular/Uneven, Splintery
Density:
2.28 - 2.33 g/cm3 (Measured)    2.326 g/cm3 (Calculated)
Comment:
AC B 32:1460 (1976) structure.

Optical Data of BrassiteHide

Type:
Biaxial (+)
RI values:
nα = 1.531 nβ = 1.546 nγ = 1.562
Birefringence:
0.031
Max Birefringence:
δ = 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v moderate
Optical Extinction:
XYZ=bac; 2V=very large
Pleochroism:
Non-pleochroic

Chemical Properties of BrassiteHide

Formula:
Mg(HAsO4) · 4H2O
IMA Formula:
Mg(AsO3OH) · 4H2O

Crystallography of BrassiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 7.472 Å, b = 10.891 Å, c = 16.585 Å
Ratio:
a:b:c = 0.686 : 1 : 1.523
Unit Cell V:
1,349.65 ų (Calculated from Unit Cell)
Z:
8

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
5.55 Å(80)
5.45 Å(80)
4.95 Å(100)
4.52 Å(80)
3.98 Å(80)
3.73 Å(80)
3.30 Å(80)
3.08 Å(100)
Comments:
ICDD 23-1228 (synthetic), also 29-860 (calculated pattern).

Type Occurrence of BrassiteHide

Geological Setting of Type Material:
Post-mine alteration of arsenic ore.
Associated Minerals at Type Locality:

Synonyms of BrassiteHide

Other Language Names for BrassiteHide

German:Brassit
Spanish:Brassita

Common AssociatesHide

Associated Minerals Based on Photo Data:
11 photos of Brassite associated with RößleriteMg(HAsO4) · 7H2O
1 photo of Brassite associated with ArsenicAs

Related Minerals - Nickel-Strunz GroupingHide

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.05GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.10NewberyiteMg(HPO4) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2OMon. 2/m : P2/b
8.CE.20RößleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
8.CE.25MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
8.CE.25SwitzeriteMn2+3(PO4)2 · 7H2OMon.
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
8.CE.35BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ErythriteCo3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ManganohörnesiteMn2+3(AsO4)2 · 8H2OMon. 2/m : P2/m
8.CE.40ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.45SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
8.CE.50CattiiteMg3(PO4)2 · 22H2OTric. 1 : P1
8.CE.55KoninckiteFe3+PO4 · 3H2OTet.
8.CE.60KaňkiteFeAsO4 · 3.5H2OMon. 2 : P2
8.CE.65SteigeriteAl(VO4) · 3H2OMon. 2/m : P21/m
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2OMon. 2/m : P2/m
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2OMon.
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2OMon.
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2OTric. 1 : P1
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.
8.CE.80SantabarbaraiteFe3+3(PO4)2(OH)3 · 5H2OAmor.
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.2.1BearsiteBe2(AsO4)(OH) · 4H2OMon.
20.2.3RößleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
20.2.4HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
20.2.5WeiliteCa(HAsO4)Tric. 1 : P1
20.2.6JohnbaumiteCa5(AsO4)3OHHex. 6/m : P63/m
20.2.7HaidingeriteCaHAsO4 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
20.2.8PharmacoliteCa(HAsO4) · 2H2OMon. m
20.2.9SainfelditeCa5(AsO4)2(AsO3OH)2 · 4H2OMon. 2/m : B2/b
20.2.10VladimiriteCa4(AsO4)2(AsO3OH) · 4H2OMon. 2/m : P21/b
20.2.11GuériniteCa5(AsO4)2(HAsO4)2 · 9H2OMon. 2/m : P21/b
20.2.12FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
20.2.13RauenthaliteCa3(AsO4)2 · 10H2OTric. 1 : P1
20.2.14PhaunouxiteCa3(AsO4)2 · 11H2OTric.
20.2.15McneariteNaCa5(AsO4)(HAsO4)4 · 4H2OTric.
20.2.16BergslagiteCaBeAsO4(OH)Mon. 2/m : P21/b
20.2.17AdeliteCaMg(AsO4)(OH)Orth. 2 2 2 : P21 21 21
20.2.18TalmessiteCa2Mg(AsO4)2 · 2H2OTric.
20.2.19IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2OMon.
20.2.20CamgasiteCaMg(AsO4)(OH) · 5H2OMon. 2/m : P21/m
20.2.21PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2OTric. 1 : P1
20.2.22BariopharmacosideriteBa0.5Fe3+4(AsO4)3(OH)4 · 5H2OTet. 4 2m : P4 2m

Fluorescence of BrassiteHide

Not fluorescent.

Other InformationHide

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 BrassiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bull. Min. (1973) 96:365
American Mineralogist (1975): 60: 945.
Acta Crystallographica (1976): B32: 1460-1466, structure.

Internet Links for BrassiteHide

Localities for BrassiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Ontario
    • Timiskaming District
      • Cobalt-Gowganda region
        • Cobalt area
          • Coleman Township
Percival, J. B., Kwong, Y. J., Dumaresq, C., & Michel, F. Distribution of As, Ni and Co in Tailings and Surface Waters in the Cobalt Area, Ontario. 2007
Czech Republic (TL)
 
  • Karlovy Vary Region
    • Karlovy Vary District
Bull.Soc.fr.Min.Crist.(1974) 96, 365-370
France
 
  • Occitanie
    • Aude
      • Salsigne
Le Règne Minéral, Hors série (3), 36-54
      • Villanière
G. Favreau : "La mine d'or de Salsigne : Les minéraux des scories de Villagnère", Le Règne Minéral, hors série, 3, 55-60, 1997
Germany
 
  • Baden-Württemberg
    • Freiburg
      • Rottweil
        • Schenkenzell
Handbook of Mineralogy
  • Hesse
    • Darmstadt
      • Main-Kinzig-Kreis
        • Biebergemünd
Handbook of Mineralogy
    • Hersfeld-Rotenburg
      • Nentershausen
        • Süß
          • Richelsdorf Smelter
S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
Poland
 
  • Lower Silesian Voivodeship
    • Kłodzko County
      • Nowa Ruda
Handbook of Mineralogy
 
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