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Magnesiochlorophoenicite

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Formula:
(Mg,Mn)3Zn2(AsO4)(OH,O)6
System:
Monoclinic
Colour:
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:
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

Approved
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
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Type Occurrence of Magnesiochlorophoenicite

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:

Physical Properties of Magnesiochlorophoenicite

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:
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.

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 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).

Optical Data of Magnesiochlorophoenicite

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 Magnesiochlorophoenicite

Formula:
(Mg,Mn)3Zn2(AsO4)(OH,O)6
Essential elements:
All elements listed in formula:
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

8.BE.05AugeliteAl2(PO4)(OH)3
8.BE.10GrattarolaiteFe33+(PO4)O3
8.BE.15CornetiteCu3(PO4)(OH)3
8.BE.20ClinoclaseCu3(AsO4)(OH)3
8.BE.25ArhbariteCu2Mg(AsO4)(OH)3
8.BE.25GilmariteCu3(AsO4)(OH)3
8.BE.30AllactiteMn72+(AsO4)2(OH)8
8.BE.30FlinkiteMn22+Mn3+(AsO4)(OH)4
8.BE.30RaadeiteMg7(PO4)2(OH)8
8.BE.30ArganditeMn7(VO4)2(OH)8
8.BE.35Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6
8.BE.40Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5
8.BE.45DixeniteCuMn142+Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6
8.BE.45Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23
8.BE.45KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16
8.BE.45McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
8.BE.45Arakiite(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23
8.BE.45Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+x
8.BE.45CarlfrancisiteMn32+(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42
8.BE.50SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
8.BE.55Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8
8.BE.60KoliciteMn72+Zn4(AsO4)2(SiO4)2(OH)8
8.BE.65Sabelliite(Cu,Zn)2Zn(AsO4,SbO4)(OH)3
8.BE.70JarosewichiteMn32+Mn3+(AsO4)(OH)6
8.BE.75TheisiteCu5Zn5(AsO4,SbO4)2(OH)14
8.BE.80CoparsiteCu4(AsO4,VO4)O2Cl
8.BE.85WaterhouseiteMn72+(PO4)2(OH)8
20.8.1SarkiniteMn22+(AsO4)(OH)
20.8.2EveiteMn22+(AsO4)(OH)
20.8.3ArsenoclasiteMn52+(AsO4)2(OH)4
20.8.4FlinkiteMn22+Mn3+(AsO4)(OH)4
20.8.5JarosewichiteMn32+Mn3+(AsO4)(OH)6
20.8.6AllactiteMn72+(AsO4)2(OH)8
20.8.7KrautiteMn(HAsO4) · H2O
20.8.8SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2O
20.8.10GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2O
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
20.8.16Wallkilldellite-(Mn)Ca2Mn32+(AsO4)2(OH)4 · 9H2O
20.8.17BerzeliiteNaCa2(Mg,Mn2+)2(AsO4)3
20.8.18Manganberzeliite(Ca,Na)3(Mn2+,Mg)2(AsO4)3
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23
20.8.22GrischuniteNaCa2Mn52+Fe3+(AsO4)6 · 2H2O

Other Names for Magnesiochlorophoenicite

Name in Other Languages:

Other Information

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 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

Localities for Magnesiochlorophoenicite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Mineral and/or Locality  
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