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Magnesiochlorophoenicite

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


Magnesium analogue of Chlorophoenicite. To date only a few specimens are known with Mg>Mn. Formerly, magnesiochlorophoenicite was a name commonly given to specimens of this series and hundreds of specimens in old collections are so labeled, but recent quantitative chemical surveys have failed to find more than a few verified specimens, all but one of which are from Franklin. The remaining verified specimen is from Ogdensburg and it is still unique. In general, specimens formerly labeled magnesium chlorophoenicite or magnesiochlorophoenicite have been proven to be misidentified and the specimens are almost always Mn-dominant chlorophoenicite, the very abundant end-member. There is no identification value relating to the apparent thickness of crystals as has been attributed by folklore. Chemical analysis is the only definitive method of validation.

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
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
Simplified for copy/paste:(Mg,Mn)3Zn2(AsO4)(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,Fe
3+
 
)
 
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,Fe
3+
 
)
 
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

Search Engines:
  • Look for Magnesiochlorophoenicite on Google
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  • External Links:
  • Look for Magnesiochlorophoenicite on Webmineral
  • Look for Magnesiochlorophoenicite on Athena Mineralogy
  • Look for Magnesiochlorophoenicite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Magnesium-chlorophoenicite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Magnesiochlorophoenicite

    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.
    (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.
    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
    Specifically mentioned as not known from the Sterling Mine in Dunn, P.J. (1995), although said not unlikely to occur. Verified on Jeff Weissman specimen using EDS.
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