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Whiteite-(CaMnMg) (Whiteit-(CaMnMg))

Pictures (1 Images total)

Roscherit (braun) mit Whiteit-(CaMnMg) (gelb)
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Roscherit (braun) mit Whiteit-(CaMnMg) (gelb)
Bildbreite: 4 mm; Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA
Copyright: Joachim Esche; Contribution: slugslayer
Location: USA/South Dakota/Custer Co./Custer District/Fourmile/Tip Top Mine
Mineral: Roscherite, Whiteite-(CaMnMg)
Image: 1250030938
Rating: 7 (votes: 2)
License: Usage for Mineralienatlas project only
Roscherit (braun) mit Whiteit-(CaMnMg) (gelb)

Bildbreite: 4 mm; Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA
Copyright: Joachim Esche
Contribution: slugslayer 2009-08-12
Locality: Tip Top Mine / Fourmile / Custer District / Custer Co. / South Dakota / USA

Collectors Summary

Color grünlichgelb
Streak color weiß
Hardness (Mohs) 3.5
Crystal System monoklin, P2/a, Pa

Chemism

Chemical formula

CaMnMg2Al2(PO4)4(OH)2·8H2O

Chemical composition

Aluminium, Calcium, Magnesium, Mangan, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 755.6129171 u; Number of atoms in the formula: 54

Info

Empirical formula:

CaMnMg2Al2(PO4)4(OH)2·8H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.40

18

33.33

1.0079470

18.1430460
Oxygen

O

55.05

26

48.15

15.9994300

415.9851800
Magnesium

Mg

6.43

2

3.70

24.3050600

48.6101200
Aluminium

Al

7.14

2

3.70

26.9815382

53.9630764
Phosphorus

P

16.40

4

7.41

30.9737612

123.8950448
Calcium

Ca

5.30

1

1.85

40.0784000

40.0784000
Manganese

Mn

7.27

1

1.85

54.9380499

54.9380499

Analysis wt%

Al2O3 : 12.90, MgO : 9.40, CaO : 5.60, MnO : 12.00, FeO : 1.60, P2O5 : 38.20, H2O : 20.80 (Ref: Canadian Mineralogist 89)

Strunz 9th edition incl. updates

8.DH.15

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
H: Mit großen und mittelgroßen [Kationen], (OH, etc.):RO4 < 1:1
15:Whiteit-Jahnsit-Gruppe

Lapis Classification

VII/D.29-020

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
D: Wasserhaltige Phosphate, mit fremden Anionen
29: Mittelgroße und sehr große Kationen: Al-Mg und Ca-Na-K; Whiteit-Gruppe

Classification by Hölzel

8.DL.220

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
L: very large=2, very small-medium=2+3
2: Whiteite-Jahnsite-Group

Dana 8th edition

42.11.03.03

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
11: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)4 (XO4)3 Zq · x(H2O)
03: Whiteite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Jahnsite group  ⇒ Whiteite subgroup

Optical Properties

Color

grünlichgelb

Streak color

weiß

max. Birefringence

0.011
Birefringence chart\! Whiteite-(CaMnMg) title=Birefringence chart Whiteite-(CaMnMg)

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

1.580

RI value β

1.584

RI value γ / ε

1.591

Ri mean

1.585

2V angle

Biaxial (+) 81°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m, m

Space Group number

13, 7

Space Group

P2/a, Pa

Cell parameters a (Å)

14.842

Cell parameters b (Å)

6.976

Cell parameters c (Å)

10.109

Cell parameters a/b or c/a

2.128

Cell parameters c/b

1.449

Cell parameters α

90°

Cell parameters β

112.60

Cell parameters γ

90°

Z

2

Volumne (ų)

966.29

X-Ray Powder Diffraction

9.31(100),
4.85(50),
3.51(50),
3.256(40),
2.953(50),
2.867(40),
2.790(80),
2.547(40)
XRD chart Whiteite-(CaMnMg)

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.63 (gemessen)

2.597 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/South Dakota/Custer Co./Custer District/Fourmile/Tip Top Mine

Preface

Author (Name, Year)

Grice & Dunn & Ramik, 1989

References

Canadian Mineralogist 27 (1989), 699

IMA group assignments

 
Jahnsite group
 
 
 

 
 
Whiteite subgroup
 
 
 

 
 
 
Rittmannite
Mn2+Mn2+Fe2+2Al2(OH)2(PO4)4·8H2O
monoklin
P2/a

 
 
 
Whiteite-(CaFeMg)
Ca(Fe2+,Mn2+)Mg2Al2(PO4)4(OH)2·8H2O
monoklin
P2/a

 
 
 
Whiteite-(CaMgMg)
CaMgMg2Al2(PO4)4(OH)2·8H2O
monoklin
P2/a

 
 
 
Whiteite-(CaMnFe)
CaMn2+Fe2+2Al2(PO4)4(OH)2·8H2O
monoklin
P2/a

 
 
 
Whiteite-(CaMnMg)
CaMnMg2Al2(PO4)4(OH)2·8H2O
monoklin
P2/a, Pa

 
 
 
Whiteite-(CaMnMn)
CaMn2+Mn2+2Al2(PO4)4(OH)2·8H2O
monoklin
P2/a

 
 
 
Whiteite-(MnFeMg)
(Mn2+,Ca)(Fe2+,Mn2+)Mg2Al2(PO4)4(OH)2·8H2O
monoklin
P2/a

 
 
 
Whiteite-(MnMnMg)
Mn2+Mn2+Mg2Al2(PO4)4(OH)2·8H2O
monoklin
P2/a

 
 
 
Whiteite-(MnMnMn)
Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2⋅8H2O
monoklin
P2/a

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Actuality: 26. Mar 2023 - 23:58:14

Other languages

German

Whiteit-(CaMnMg)

French

Whiteite-(CaMnMg)

English

Whiteite-(CaMnMg)

Spanish

Whiteíta-(CaMnMg)

Russian

Уайтит-(CaMnMg)

CNMNC (IMA)-Number

IMA 1986-012

CNMNC symbol

Symbol

Wt-CaMnMg

Locations with GPS information