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Magnesiochlorophoenicite

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Formula:
(Mg,Mn)3Zn2(AsO4)(OH,O)6
Colour:
Colorless, white; colorless in transmitted light.
Lustre:
Sub-Vitreous, Silky
Hardness:
3 - 3½
Specific Gravity:
3.37
Crystal System:
Monoclinic
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:
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.


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Classification of MagnesiochlorophoeniciteHide

Approved, 'Grandfathered' (first described prior to 1959)
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
41.1.1.2

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

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

Physical Properties of MagnesiochlorophoeniciteHide

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

Optical Data of MagnesiochlorophoeniciteHide

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

Formula:
(Mg,Mn)3Zn2(AsO4)(OH,O)6
IMA Formula:
Mg3Zn2AsO4(OH,O)6

Crystallography of MagnesiochlorophoeniciteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 23.02 Å, b = 3.3 Å, c = 7.34 Å
β = 106.22°
Ratio:
a:b:c = 6.976 : 1 : 2.224
Unit Cell 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 DiffractionHide

Powder Diffraction Data:
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).

Type Occurrence of MagnesiochlorophoeniciteHide

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:

Synonyms of MagnesiochlorophoeniciteHide

Other Language Names for MagnesiochlorophoeniciteHide

Related Minerals - Nickel-Strunz GroupingHide

8.BE.05AugeliteAl2(PO4)(OH)3Mon. 2/m : B2/m
8.BE.10GrattarolaiteFe3+3(PO4)O3Trig. 3m : R3m
8.BE.15CornetiteCu3(PO4)(OH)3Orth. mmm (2/m 2/m 2/m) : Pbca
8.BE.20ClinoclaseCu3(AsO4)(OH)3Mon. 2/m : P21/b
8.BE.25ArhbariteCu2Mg(AsO4)(OH)3Tric. 1 : P1
8.BE.25GilmariteCu3(AsO4)(OH)3Tric.
8.BE.30AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
8.BE.30FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth.
8.BE.30RaadeiteMg7(PO4)2(OH)8Mon. 2/m
8.BE.30ArganditeMn7(VO4)2(OH)8Mon. 2/m : P21/m
8.BE.35Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
8.BE.40Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5Tric.
8.BE.45DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6Trig.
8.BE.45Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
8.BE.45KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16Orth. 2 2 2 : C2 2 21
8.BE.45McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m (3 2/m)
8.BE.45Arakiite(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23Mon.
8.BE.45Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+xTrig.
8.BE.45CarlfrancisiteMn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42 Trig. 3m (3 2/m) : R3c
8.BE.50SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.BE.55Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8Orth. mmm (2/m 2/m 2/m) : Ccca
8.BE.60KoliciteMn2+7Zn4(AsO4)2(SiO4)2(OH)8Orth. mmm (2/m 2/m 2/m) : Cmca
8.BE.65Sabelliite(Cu,Zn)2Zn(AsO4,SbO4)(OH)3Trig. 3 : P3
8.BE.70JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
8.BE.75TheisiteCu5Zn5(AsO4,SbO4)2(OH)14Orth.
8.BE.80CoparsiteCu4(AsO4,VO4)O2ClOrth.
8.BE.85WaterhouseiteMn2+7(PO4)2(OH)8Mon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide

41.1.1.1Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
41.1.1.3JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.8.1SarkiniteMn2+2(AsO4)(OH)Mon. 2/m : P2/m
20.8.2EveiteMn2+2(AsO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnnm
20.8.3ArsenoclasiteMn2+5(AsO4)2(OH)4Orth.
20.8.4FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth.
20.8.5JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
20.8.6AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
20.8.7KrautiteMn(HAsO4) · H2OMon. 2 : P21
20.8.8SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2OTric. 1 : P1
20.8.10GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2OMon. 2/m : P21/b
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2OTric. 1 : P1
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
20.8.16WallkilldelliteCa2Mn2+3(AsO4)2(OH)4 · 9H2OHex.
20.8.17Berzeliite(NaCa2)Mg2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.18ManganberzeliiteNaCa2Mn2+2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
20.8.22GrischuniteNaCa2Mn2+5Fe3+(AsO4)6 · 2H2OOrth.

Fluorescence of MagnesiochlorophoeniciteHide

Not fluorescent

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MagnesiochlorophoeniciteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 MagnesiochlorophoeniciteHide

Localities for MagnesiochlorophoeniciteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • 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. Material from Jeff Weissman specimen gave inconclusive results using EDS.
Mineral and/or Locality  
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