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Margarosanite

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About MargarosaniteHide

Formula:
Pb(Ca,Mn2+)2(Si3O9)
Colour:
Colorless, grayish-white (due to included native lead)
Lustre:
Resinous, Pearly, Dull
Hardness:
2½ - 3
Specific Gravity:
4.33
Crystal System:
Triclinic
Name:
Named in 1916 by William Ebenezer Ford and Walter Minor Bradley from the Greek for "pearl" and "tablet," in allusion to the pearly luster and lamellar structure of the crystallized material. The original specimens were found in 1898, but the mineral remained unnamed for nearly 18 years.
Isostructural with:
The Pb analogue of walstromite. Chemically similar to ganomalite.

A rare lead silicate found in metamorphosed Pb-Zn-Mn deposits.

Crystal structure details (Callegari and Boiocchi, 2016):
- 2 layers parallel to (101)
- Si layer: isolated three-member rings of SiO4 tetrahedra
- Ca layer: dimeric CaO6 octahedra + CaO8 polyhedra forming chains
- Ca polyhedra interconnect forming a sheet
- chains, edge-sharing, of distorted [8]Pb polyhedra


Classification of MargarosaniteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.CA.25

9 : SILICATES (Germanates)
C : Cyclosilicates
A : [Si3O9]6- 3-membered single rings (dreier-Einfachringe), without insular complex anions
59.1.2.2

59 : CYCLOSILICATES Three-Membered Rings
1 : Three-Membered Rings, anhydrous, no other anions
14.13.5

14 : Silicates not Containing Aluminum
13 : Silicates of Pb

Pronounciation of MargarosaniteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of MargarosaniteHide

Resinous, Pearly, Dull
Transparency:
Transparent, Translucent
Colour:
Colorless, grayish-white (due to included native lead)
Streak:
White
Hardness:
2½ - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{010} perfect, {100} good, {001} fair
Fracture:
Irregular/Uneven, Micaceous
Density:
4.33 g/cm3 (Measured)    4.31 g/cm3 (Calculated)

Optical Data of MargarosaniteHide

Type:
Biaxial (-)
RI values:
nα = 1.727 nβ = 1.771 nγ = 1.798
Birefringence:
0.071
Max Birefringence:
δ = 0.071
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong
Pleochroism:
Non-pleochroic

Chemical Properties of MargarosaniteHide

Formula:
Pb(Ca,Mn2+)2(Si3O9)
IMA Formula:
Ca2PbSi3O9
Common Impurities:
Fe,Zn,Mg,Ba,H2O

Crystallography of MargarosaniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 6.77 Å, b = 9.64 Å, c = 6.75 Å
α = 110.58°, β = 102°, γ = 88.5°
Ratio:
a:b:c = 0.702 : 1 : 0.7
Unit Cell V:
402.87 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals are extremely rare, but have a thin bladed appearance with acute crystal profile.
Comment:
Data from cr. structure refinement (Callegari & Boiocchi, 2016), approximated: a=6.74, b=9.53, c=6.70, α=110.19, β=103.05, γ=83.04

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0010672MargarosaniteFreed R L, Peacor D R (1969) Determination and refinement of the crystal structure of margarosanite, PbCa2Si3O9 Zeitschrift fur Kristallographie 128 213-2281969Parker Shaft, North Mine Hill, Franklin, New Jersey, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.967 Å(31)
6.588 Å(75)
6.122 Å(49)
5.193 Å(49)
5.097 Å(80)
5.023 Å(37)
4.483 Å(24)
4.444 Å(28)
4.384 Å(56)
4.121 Å(30)
4.050 Å(3)
4.009 Å(8)
3.903 Å(10)
3.791 Å(29)
3.627 Å(4)
3.499 Å(38)
3.373 Å(28)
3.294 Å(9)
3.273 Å(19)
3.221 Å(54)
3.176 Å(59)
3.127 Å(8)
3.088 Å(32)
3.045 Å(78)
3.034 Å(91)
2.989 Å(100)
Comments:
ICDD 27-79 many lines down to 2.025 (14)

Type Occurrence of MargarosaniteHide

Other Language Names for MargarosaniteHide

Relationship of Margarosanite to other SpeciesHide

Other Members of this group:
BreyiteCa3Si3O9Tric. 1 : P1
WalstromiteBaCa2(Si3O9)Tric.

Common AssociatesHide

Associated Minerals Based on Photo Data:
31 photos of Margarosanite associated with WillemiteZn2SiO4
13 photos of Margarosanite associated with Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
8 photos of Margarosanite associated with CalciteCaCO3
7 photos of Margarosanite associated with Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
7 photos of Margarosanite associated with WollastoniteCaSiO3
7 photos of Margarosanite associated with AndraditeCa3Fe3+2(SiO4)3
6 photos of Margarosanite associated with MicroclineK(AlSi3O8)
6 photos of Margarosanite associated with Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16
6 photos of Margarosanite associated with ClinohedriteCaZn(SiO4) · H2O
5 photos of Margarosanite associated with Hyalophane(K,Ba)[Al(Si,Al)Si2O8]

Related Minerals - Nickel-Strunz GroupingHide

9.CA.05BaziriteBaZr(Si3O9)Hex.
9.CA.05BenitoiteBaTi(Si3O9)Hex. 6 m2 : P62c
9.CA.05PabstiteBa(Sn,Ti)(Si3O9)Hex.
9.CA.10WadeiteK2Zr(Si3O9)Hex.
9.CA.15CalciocatapleiiteCaZr(Si3O9) · 2H2OOrth.
9.CA.15CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
9.CA.20PseudowollastoniteCaSiO3Mon. 2/m : B2/b
9.CA.25WalstromiteBaCa2(Si3O9)Tric.
9.CA.30Bobtraillite(Na,Ca)13Sr11(Zr,Y,Nb)14(Si3O9)10(H2BSi2O9)6 · 12H2OTrig. 3m (3 2/m) : P3 1c

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

59.1.2.1WalstromiteBaCa2(Si3O9)Tric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.13.1AlamositePbSiO3Mon.
14.13.2PlumbotsumitePb13(CO3)6(Si10O27) · 3H2OOrth.
14.13.3LuddeniteCu2Pb2Si5O14 · 4H2OMon.
14.13.4MolybdophyllitePb8Mg9[Si10O28(OH)8O2(CO3)3] · H2OMon. 2 : B2
14.13.6GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex.
14.13.7KentrolitePb2Mn3+2(Si2O7)O2Orth. mmm (2/m 2/m 2/m) : Pbcm
14.13.8BarysilitePb8Mn2+[Si2O7]3Trig.
14.13.9MelanotekitePb2Fe3+2(Si2O7)O2Orth. 2 2 2 : C2 2 21
14.13.10CreaseyitePb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

Fluorescence of MargarosaniteHide

Bright blue-white, pink (MR UV, SW UV).

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.
Industrial Uses:
None.

References for MargarosaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ford, W.E. and Bradley, W.M. (1916) Margarosanite, a new lead-calcium silicate from Franklin, N.J., American Journal of Science: 42: 159-162.
Ford, W.E. and Bradley, W.M. (1916) Anmerican Mineralogist: 1: 87-88 (abstract).
Palache, Charles (1935), The Minerals of Franklin and Sterling Hill, Sussex County, New Jersey: USGS PP 180: 70.
Armstrong, R.L. (1963) New data on margarosanite. American Mineralogist: 48: 698-703.
Glasser, F.P. and Glasser, L.S.D. (1964) Additional notes on Margarosanite. American Mineralogist: 49: 781-782.
American Mineralogist (1968): 53: 236.
Freed, B. and Peacor, D.R. (1969) Determination and refinement of the crystal structure of margarosanite, PbCa2Si3O9. Zeitschrift für Kristallographie: 128: 213-228.
Dunn, P.J., et al (1984): American Mineralogist: 69: 1150-1155.
Dunn, Pete J. (1985), The lead silicates from Franklin, New Jersey: occurrence and composition: Mineralogical Magazine: 49: 721-727.
Dunn, Pete J. (1995): Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits, Part 4: 499-500.
Canadian Mineralogist (1998): 1311-1320.
Callegari, A.M. and Boiocchi, M. (2016): Crystal structure refinement of margarosanite PbCa2Si3O9 and relationship with walstromite BaCa2Si3O9. Neues Jahrbuch für Mineralogie - Abhandlungen: 193: 205-213.

Internet Links for MargarosaniteHide

Localities for MargarosaniteHide

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.
Sweden
 
  • Värmland County
    • Filipstad
      • Långban Ore District
Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
Adolfsson, S. G. (1979): Notes on Recent Underground Collecting at Långban. Mineralogical Record. 10: 215-217
      • Nordmark District
        • Jakobsberg ore field
Gatedal, K. (2014) Wollastonit och margarosanit från Långban och Jakobsberg. LångbansNytt, 20:20-22
      • Persberg ore district
        • Pajsberg
Nysten, P. (1994): Manganrik ferro-ferriwinchit, pyrofanit, margarosanit och jacobsit, Harstigen. Långbansnytt. vol 10. [reprinted in: Långbansnytt. De första 20 åren 1983-2003. Långbansällskapet - Skrifter och rapporter. 2, 62-63]
USA
 
  • New Jersey
    • Sussex County
      • Franklin Mining District
        • Franklin
Dunn, P.J., et al: Am.Min.:69:1150-1155 (1984); Palache(1935):70; Dunn(1995):Pt4:499-500.
Van King
Van King; Chester S. Lemanski, Jr. Ronald DeBlois.
Palache(1935):70; Dunn(1995):Pt4:499-500.
 
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