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Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
© Christopher O'Neill
|System:||Triclinic||Colour:||Colorless, greyish-white ...|
|Hardness:||2½ - 3|
|Name:||Named in 1916 by William Ebenezer Ford and W. M. 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.|
A rare lead silicate found in metamorphosed Pb-Zn-Mn deposits.
Classification of Margarosanite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/E.02-20|
|Nickel-Strunz 10th (pending) edition ID:||9.CA.25|
9 : SILICATES (Germanates)
C : Cyclosilicates
A : [Si3O9]6- 3-membered single rings (dreier-Einfachringe), without insular complex anions
|Dana 8th edition ID:||22.214.171.124|
59 : CYCLOSILICATES Three-Membered Rings
1 : Three-Membered Rings, anhydrous, no other anions
|Hey's CIM Ref.:||14.13.5|
14 : Silicates not Containing Aluminum
13 : Silicates of Pb
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Type Occurrence of Margarosanite
|Type Locality:||Parker Mine (Parker shaft), Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA|
|Year of Discovery:||1916|
|Geological Setting of type material:||Altered areas of metamorphosed zinc-manganese-iron silicate-oxide orebodies|
|Associated Minerals at type locality:|
Physical Properties of Margarosanite
|Diaphaneity (Transparency):||Transparent, Translucent|
|Colour:||Colorless, greyish-white (due to included native lead)|
|Hardness (Mohs):||2½ - 3|
Crystallography of Margarosanite
|Cell Parameters:||a = 6.77Å, b = 9.64Å, c = 6.75Å|
α = 110.58°, β = 102°, γ = 88.5°
|Ratio:||a:b:c = 0.702 : 1 : 0.7|
|Unit Cell Volume:||V 402.87 Å³ (Calculated from Unit Cell)|
|X-Ray Powder Diffraction:|
Optical Data of Margarosanite
|RI values:||nα = 1.727 nβ = 1.771 nγ = 1.798|
|Maximum Birefringence:||δ = 0.071|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
Chemical Properties of Margarosanite
|Essential elements:||Ca, O, Pb, Si|
|All elements listed in formula:||Ca, Mn, O, Pb, Si|
Relationship of Margarosanite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Margarosanite
|Fluorescence in UV light:||Bright blue-white, pink (MR UV, SW UV).|
|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 Margarosanite
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.
Internet Links for Margarosanite
Localities for Margarosanite
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.
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Locality Updated: Challenge deposit, Emerald Lake Hills, San Mateo Co., California, USAFrom Brent Thorne, 7th Dec 2013 23:31:03