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Fluckite

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Gabe Gottes Mine (incl. Giftgrube), Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France
© Stephan Wolfsried

Show Fluckite Photos (13)



Formula:
CaMn
2+
 
(HAsO
 
4
)
 
2
 · 2H
 
2
O
System:TriclinicColour:colorless, pale pink, ...
Hardness:3½ - 4
Name:Named in honour of Pierre Fluck, Louis Pasteur University, Strasbourg, and later Universite de Haute-Alsace, France, who discovered the first specimen of the species.
This page provides mineralogical data about Fluckite.

Classification of Fluckite

IMA status:Approved
Strunz 8th edition ID:7/C.16-30
Nickel-Strunz 10th (pending) edition ID:8.CB.15

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
Dana 8th edition ID:39.1.2.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
Hey's CIM Ref.:20.8.13

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
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Type Occurrence of Fluckite

Type Locality:Gabe Gottes Mine (incl. Giftgrube), Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France
Year of Discovery:1980

Physical Properties of Fluckite

Lustre:Sub-Vitreous, Waxy
Diaphaneity (Transparency):Transparent, Translucent
Colour:colorless, pale pink, pale rose red
Streak:White
Hardness (Mohs):3½ - 4
Tenacity:Brittle
Cleavage:Perfect
{010| perfect, {100} good; {101} poor.

Crystallography of Fluckite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Space Group Setting:P1
Cell Parameters:a = 8.459Å, b = 7.613Å, c = 6.968Å
α = 82.21°, β = 98.25°, γ = 95.86°
Ratio:a:b:c = 1.111 : 1 : 0.915
Unit Cell Volume:V 438.42 ų (Calculated from Unit Cell)
Z:2
Morphology:Acicular, occasionally slender rod-like to prismatic
Comment:Bull Min 103:129 (1980) structure
X-Ray Powder Diffraction:
d-spacingIntensity
8.32 (50)
7.51 (100)
3.77 (60)
3.53 (90)
3.27 (90)
2.98 (80)
2.69 (60)
2.67 (50)
Comments:ICDD 33-290; 34-161

Optical Data of Fluckite

Type:Biaxial
RI values: nα = 1.618 nβ = 1.627 nγ = 1.642
Birefringence:0.024
Maximum Birefringence:δ = 0.024

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v
Optical Extinction:2V=large
Pleochroism:Non-pleochroic

Chemical Properties of Fluckite

Formula:
CaMn
2+
 
(HAsO
 
4
)
 
2
 · 2H
 
2
O
Essential elements:As, Ca, H, Mn, O
All elements listed in formula:As, Ca, H, Mn, O

Relationship of Fluckite to other Species

Common Associates:
PicropharmacolitePharmacolite
Related Minerals - Nickel-Strunz Grouping):

- +
8.CB.05Serrabrancaite
MnPO
 
4
 · H
 
2
O
8.CB.10Hureaulite
(Mn,Fe)
 
5
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10Villyaellenite
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10UM1997-09-AsO:CaHMgZn
(Mg,Ca,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10Nyholmite
Cd
 
3
Zn
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10Miguelromeroite
MnMn
 
2
Mn
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.15Krautite
Mn(HAsO
 
4
) · H
 
2
O
8.CB.20Cobaltkoritnigite
(Co,Zn)(HAsO
 
4
) · H
 
2
O
8.CB.20Koritnigite
Zn(HAsO
 
4
) · H
 
2
O
8.CB.25Yvonite
Cu(HAsO
 
4
) · 2H
 
2
O
8.CB.30Geminite
Cu(HAsO
 
4
) · H
 
2
O
8.CB.35Schubnelite
Fe
3+
 
VO
 
4
 · H
 
2
O
8.CB.40Radovanite
Cu
 
2
Fe
3+
 
(AsO
 
4
)(HAs
3+
 
O
 
3
)
 
2
 · H
 
2
O
8.CB.45Kazakhstanite
Fe
3+
5
V
4+
3
V
5+
12
O
 
39
(OH)
 
9
 · 9H
 
2
O
8.CB.50Kolovratite
Ni
 
x
Zn
 
y
(VO
 
4
)
 
0.67(x+y)
 · nH
 
2
O
8.CB.55Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.60Burgessite
Co
 
2
(HAsO
 
4
)
 
2
 · 5H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.8.1Sarkinite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.2Eveite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.3Arsenoclasite
Mn
2+
5
(AsO
 
4
)
 
2
(OH)
 
4
20.8.4Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
20.8.5Jarosewichite
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
20.8.6Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
20.8.7Krautite
Mn(HAsO
 
4
) · H
 
2
O
20.8.8Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
 · 2H
 
2
O
20.8.9Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O
20.8.10Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 10H
 
2
O
20.8.11Akrochordite
(Mn
2+
 
,Mg)
 
5
(AsO
 
4
)
 
2
(OH)
 
4
 · 4H
 
2
O
20.8.12Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.8.14Brandtite
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
 · 2H
 
2
O
20.8.15Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
 · 2H
 
2
O
20.8.16Wallkilldellite-(Mn)
Ca
 
2
Mn
2+
3
(AsO
 
4
)
 
2
(OH)
 
4
 · 9H
 
2
O
20.8.17Berzeliite
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
20.8.18Manganberzeliite
(Ca,Na)
 
3
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
20.8.19Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.8.20Villyaellenite
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.8.21Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
20.8.22Grischunite
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
 · 2H
 
2
O

Other Names for Fluckite

Synonyms:
IMA1978-054
Other Languages:
German:Fluckit
Russian:Флюкит
Spanish:Fluckita

Other Information

Fluorescence in UV light:Not fluorescent
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Fluckite

Reference List:

- +
Bari, H., C., Fabien, Permingeat, F., Pillard, F. (1980): Fluckite, a hydrated calcium manganese arsenate: CaMnH2(AsO4)2.2H2O. Bull. Minéral. 103, 122-128. (in French).

Bull. Minéral. 103: 129-134.

American Mineralogist (1980): 65: 1066.

Internet Links for Fluckite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • Localities for Fluckite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov (St Joachimsthal) District
    		Lapis 2002(7/8), 63-65
    France
     
    • Alsace
      • Haut-Rhin
        • Ste Marie-aux-Mines (Markirch)
    		Bull.Min.(1980) 103, 122-128; Bari: Lapis 6/1983
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Ogdensburg
            • Sterling Hill
    		MinRec 19:274, 18:360; The Picking Table:28(2):3; Dunn(1995):Pt5:668.
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