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Magnesiochlorophoenicite

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Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
© 2008, JGW




Formula:
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
System:MonoclinicColour:Colorless, white; ...
Hardness:3 - 3½
Name:Named in 1935 in allusion to the dominance of Mg over Mn in the composition and its relationship to Chlorophoenicite.
Isostructural with:Chlorophoenicite


Magnesium analogue of Chlorophoenicite. To date only a few specimens are known with Mg>Mn. Magnesiochlorophoenicite was a name commonly given to specimens of this series, but recent quantitative chemical surveys have failed to find more than a few verified specimens. In general, specimens formerly labeled magnesiochlorophoenicite have been proven to be misidentified and the specimens are almost always Mn-dominant chlorophoenicite. There is no identification value relating to the apparent thickness of crystals.

Classification of Magnesiochlorophoenicite

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID:8.BE.35

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
Dana 8th edition ID:41.1.1.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p > 4:1
Hey's CIM Ref.:20.8.19

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

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Year of Discovery:1935
Geological Setting of type material:In secondary veinlets in massive ore in a metamorphosed Pre-cambrian sedimentary Zn-Fe-Mn deposit.
Associated Minerals at type locality:
ZinciteWillemiteHaidingeriteFranklinite

Physical Properties of Magnesiochlorophoenicite

Lustre:Sub-Vitreous, Silky
Diaphaneity (Transparency):Transparent
Colour:Colorless, white; colorless in transmitted light.
Streak:White
Hardness (Mohs):3 - 3½
Tenacity:Brittle
Cleavage:Perfect
Lengthwise to fibers, perfect.
Fracture:Splintery
Density (measured):3.37 g/cm3
Density (calculated):3.18 g/cm3
Comment:Density discrepancy probably due to acicular crystals, small size, and surface tension leading to error.

Crystallography of Magnesiochlorophoenicite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Cell Parameters:a = 23.02Å, b = 3.3Å, c = 7.34Å
β = 106.22°
Ratio:a:b:c = 6.976 : 1 : 2.224
Unit Cell Volume:V 535.40 ų (Calculated from Unit Cell)
Z:2
Morphology:Occurs as acicular crystals randomly arranged or in radial aggregates of fibrous crystals.
X-Ray Powder Diffraction:
d-spacingIntensity
6.98 (20)
6.87 (20)
3.71 (50)
3.09 (40)
2.98 (30)
2.61 (100)
1.756 (20)
1.480 (10)
Comments:38-1438, also Journal of Powder Diffraction 2:225 (1987).

Optical Data of Magnesiochlorophoenicite

Type:Biaxial (+)
RI values: nα = 1.669 nβ = 1.672 nγ = 1.677
2V:Measured: large°
Birefringence:0.008
Maximum Birefringence:δ = 0.008

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:generally r < v strong, also r > v
Pleochroism:Non-pleochroic

Chemical Properties of Magnesiochlorophoenicite

Formula:
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
Essential elements:As, H, Mg, O, Zn
All elements listed in formula:As, H, Mg, Mn, O, Zn
Analytical Data:High Mg analyses are unknown and qualitative analysis are insufficient to verify the species. Maximum measured Mg:Mn:Zn = 1.00 : 0.85 : 0.31 One of the designated type specimens was not Mg dominant and was therefore misidentified (CM 1981, p. 335).
Relationship of Magnesiochlorophoenicite to other Species
Related Minerals - Nickel-Strunz Grouping):

- + 
8.BE.05Augelite
Al
 
2
(PO
 
4
)(OH)
 
3
8.BE.10Grattarolaite
Fe
3+
3
(PO
 
4
)O
 
3
8.BE.15Cornetite
Cu
 
3
(PO
 
4
)(OH)
 
3
8.BE.20Clinoclase
Cu
 
3
(AsO
 
4
)(OH)
 
3
8.BE.25Arhbarite
Cu
 
2
Mg(AsO
 
4
)(OH)
 
3
8.BE.25Gilmarite
Cu
 
3
(AsO
 
4
)(OH)
 
3
8.BE.30Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
8.BE.30Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
8.BE.30Raadeite
Mg
 
7
(PO
 
4
)
 
2
(OH)
 
8
8.BE.30Argandite
Mn
 
7
(VO
 
4
)
 
2
(OH)
 
8
8.BE.35Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.40Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
(AsO
 
4
)(OH)
 
5
8.BE.45Dixenite
CuMn
2+
14
Fe
2+
 
(SiO
 
4
)
 
2
(As
5+
 
O
 
4
)(As
3+
 
O
 
3
)
 
5
(OH)
 
6
8.BE.45Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
8.BE.45Kraisslite
Zn
 
3
(Mn,Mg)
 
25
(Fe
3+
 
,Al)(As
3+
 
O
 
3
)
 
2
[(Si,As
5+
 
)O
 
4
]
 
10
(OH)
 
16
8.BE.45Mcgovernite
Mn
 
19
Zn
 
3
(AsO
 
4
)
 
3
(AsO
 
3
)(SiO
 
4
)
 
3
(OH)
 
21
8.BE.45Arakiite
(Zn,Mn
2+
 
)(Mn
2+
 
,Mg)
 
12
(Fe
3+
 
,Al)
 
2
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
8.BE.45Turtmannite
(Mn,Mg)
 
22.5
Mg
 
3-3x
((V
5+
 
,As
5+
 
)O
 
4
)
 
3
(As
3+
 
O
 
3
)
 
x
(SiO
 
4
)
 
3
O
 
5-5x
(OH)
 
20+x
8.BE.45Carlfrancisite
Mn
2+
3
(Mn
2+
 
,Mg,Fe
3+
 
,Al)
 
42
[As
3+
 
O
 
3
]
 
2
(As
5+
 
O
 
4
)
 
4
[(Si,As
5+
 
)O
 
4
]
 
6
[(As
5+
 
,Si)O
 
4
]
 
2
(OH)
 
42
 
8.BE.50Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
 · 2H
 
2
O
8.BE.55Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
(AsO
 
4
)
 
2
(SiO
 
4
)(OH)
 
8
8.BE.60Kolicite
Mn
2+
7
Zn
 
4
(AsO
 
4
)
 
2
(SiO
 
4
)
 
2
(OH)
 
8
8.BE.65Sabelliite
(Cu,Zn)
 
2
Zn(AsO
 
4
,SbO
 
4
)(OH)
 
3
8.BE.70Jarosewichite
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
8.BE.75Theisite
Cu
 
5
Zn
 
5
(AsO
 
4
,SbO
 
4
)
 
2
(OH)
 
14
8.BE.80Coparsite
Cu
 
4
(AsO
 
4
,VO
 
4
)O
 
2
Cl
8.BE.85Waterhouseite
Mn
2+
7
(PO
 
4
)
 
2
(OH)
 
8
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
20.8.13Fluckite
CaMn
2+
 
(HAsO
 
4
)
 
2
 · 2H
 
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
20.8.20Villyaellenite
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 Magnesiochlorophoenicite
Synonyms:
Magnesium-chlorophoenicite
Other Languages:
German:Magnesium-Chlorophönizit
Other Information
Fluorescence in UV light:Not fluorescent
Special Storage/
Display Requirements from:
Sterling Mine,...,  Sussex Co.,  New Jersey,  USAProtect for fragility.
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 Magnesiochlorophoenicite
Reference List:

- + 
Palache, C. (1935) USGS Professional Paper 180: 124.



Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 780.



American Mineralogist (1968): 53: 1110-1119.



Dunn, P. J. (1981): Magnesium-chlorophoenicite redefined and new data on chlorophoenicite. Canadian Mineralogist: 19: 333-336.
Internet Links for Magnesiochlorophoenicite
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    USA
     
    

    • New Jersey
    

      • Sussex Co.
    

        • Franklin Mining District
    

          • Franklin
    
    		Palche, C. (1935) USGS Professional Paper 180: 124; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 780; Dunn, P.J. (1995): Part5: 671-672.
    




          • Ogdensburg
    

            • Sterling Hill
    
    		Dunn, P.J. (1995).
    

    


    

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