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Brassite (Brassite)

Pictures (6 Images total)

Brassit
Views (Image: 1444396083): 490
Brassit

Bildbreite: 3 mm, Fundort: St. Joachimsthal (Jáchymov), Region Karlsbad (Karlovarsky kraj), Tschechien

Copyright: Stephan Wolfsried
Contribution: thdun5 2015-10-09
Rösslerit, Brassit
Views (Image: 1444404455): 764
Rösslerit, Brassit

farblose Rösslerit-Kristalle neben weißem Brassit, Bildbreite: 2 mm, Fundort: St. Joachimsthal (Jáchymov), Region Karlsbad (Karlovarsky kraj), Tschechien

Copyright: Stephan Wolfsried
Contribution: thdun5 2015-10-09
Brassit
Views (Image: 1308522884): 719
Brassit

Svornost Schacht, Jachymov, Tschechien; Bildbreite ca. 8mm

Copyright: Stefan
Contribution: Stefan 2011-06-20
Brassit
Views (Image: 1327758589): 664
Brassit

prozellanartige, weiße Brassit-xx, pseudomorph nach Rösslerit. Mit Pikropharmolith und Pharmakolith. Fundort: Grube Svornost, Jáchymov, Karlsbad, Böhmen, Tschechien (TL). BB 2cm.

Collection: Yi Sun
Copyright: Yi Sun
Contribution: sun-mineral 2012-01-28
Brassit
Views (Image: 1337879757): 677
Brassit

Bildbreite: 5 mm; Fundort: Im Kalkes, Bebra-Iba, Richelsdorfer Gebirge,; Hessen, Deutschland.

Collection: Steinkautz
Copyright: Steinkautz
Contribution: Steinkautz 2012-05-24
Brassit
Views (Image: 1494761940): 202
Brassit (SNr: A003110)

von Jachymov, Böhmen, Tschechien; blättrige weiße Aggregate, BB = 6,2 mm

Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2017-05-14

Collectors Summary

Color weiß
Streak color weiß
Solubility +++ HCl, + H2O
Crystal System orthorhombisch, Pbca

Chemism

Chemical formula

MgHAsO4·4H2O

Chemical composition

Arsen, Magnesium, Sauerstoff, Wasserstoff

Unit weight: 236.293625 u; Number of atoms in the formula: 19

Info

Empirical formula:

MgHAsO4·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.84

9

47.37

1.0079470

9.0715230

Oxygen

O

54.17

8

42.11

15.9994300

127.9954400

Magnesium

Mg

10.29

1

5.26

24.3050600

24.3050600

Arsenic

As

31.71

1

5.26

74.9216020

74.9216020

Strunz 9th edition incl. updates

8.CE.15

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
E: Mit ausschließlich mittelgroßen Kationen, RO4:H2O = 1:2.5
15:

Lapis Classification

VII/C.15-010

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
15: Kleine und mittelgroße Kationen: Be und Al-Mn-Fe-Cu-Zn-Mg

Classification by Hölzel

8.CD.430

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
D: Phosphates, Valency: 1,2 for large, 2 for medsized Cations
4: very large: 1, large/medium=1/1, orthorhombic Newberyite-Group

Dana 8th edition

39.01.07.01

39: Hydrated Acid Phosphates, etc
01: Hydrated Acid Phosphates, etc A+ [HXO4] · x(H2O)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

weiß

Streak color

weiß

max. Birefringence

0.031

Birefringence chart\! Brassite  title=Birefringence chart Brassite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.531

RI value β

1.546

RI value γ / ε

1.562

Ri mean

1.546

2V angle

Biaxial (-) 87°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

61

Space Group

Pbca

Cell parameters a (Å)

7.472

Cell parameters b (Å)

10.891

Cell parameters c (Å)

16.585

Cell parameters a/b or c/a

0.686

Cell parameters c/b

1.523

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

1349.647

X-Ray Powder Diffraction

4.97(100),
4.54(40),
4.14(60),
3.88(50),
3.45(50),
3.20(80),
3.07(70),
2.324(50)

XRD chart Brassite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.28

2.326 ( ρ calc. Mineralienatlas )

Instability

+++ HCl, + H2O

Author (Name, Year)

Fontan & Orliac & Permingeat & Pierrot & Stahl, 1973

References

Bulletin de la Société Française Minéralogie et de Cristallographie 96 (1973), 365

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Brassite

MgHAsO4·4H2O

orthorhombisch : mmm : Pbca

8.CE.15

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Burgessite

Co2(H2O)4[AsO3(OH)]2(H2O)

monoklin : 2/m : P21/n

VII/C.15-005

Brassite

MgHAsO4·4H2O

orthorhombisch : mmm : Pbca

VII/C.15-010

Phosphorrösslerite

MgHPO4·7H2O

monoklin : 2/m : C2/c

VII/C.15-020

Rösslerite

MgHAsO4·7 H2O

monoklin : 2/m : C2/c

VII/C.15-030

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Newberyite

MgHPO4·3H2O

orthorhombisch : mmm : Pbca

8.CD.400

Brassite

MgHAsO4·4H2O

orthorhombisch : mmm : Pbca

8.CD.430

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Brushite

CaHPO4·2H2O

monoklin : m : Aa

39.01.01.01

Pharmacolite

CaHAsO4·2H2O

monoklin : m : Ia

39.01.01.02

Fluckite

CaMnH2(AsO4)2·2H2O

triklin : 1 : P1

39.01.02.01

Krautite

MnAs5+O3(OH)·H2O

monoklin : 2 : P21

39.01.03.01

Koritnigite

Zn(As5+O3)(OH)·H2O

triklin : 1 : P1

39.01.04.01

Cobaltkoritnigite

(Co,Zn)(As5+O3)(OH)·H2O

triklin : 1 : P1

39.01.04.02

Haidingerite

CaHAsO4·H2O

orthorhombisch : mmm : Pcnb

39.01.05.01

Newberyite

MgHPO4·3H2O

orthorhombisch : mmm : Pbca

39.01.06.01

Brassite

MgHAsO4·4H2O

orthorhombisch : mmm : Pbca

39.01.07.01

Dorfmanite

Na2HPO4·2H2O

orthorhombisch : mmm : Pbca

39.01.08.01

Catalanoite

Na2[PO3(OH)]·8H2O

orthorhombisch : mmm : Ibca

39.01.08.02

Rösslerite

MgHAsO4·7 H2O

monoklin : 2/m : C2/c

39.01.09.01

Phosphorrösslerite

MgHPO4·7H2O

monoklin : 2/m : C2/c

39.01.09.02

Other languages

German

Brassit

Spanish

Brassita

French

Brassite

English

Brassite

Russian

Брассит

IMA Number

IMA 1973-047

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Brassit
Google-Bilder-Suche - search for: Brassit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Brassit

English pages

Mindat - search for: Brassite
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Russian pages

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German pages

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