Margarosanite Mineral Data

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General Margarosanite Information

Chemical Formula:

Pb(Ca,Mn++)2Si3O9

Composition:

Molecular Weight = 516.23 gm

Calcium 15.45 % Ca 21.62 % CaO

Manganese 0.85 % Mn 1.10 % MnO

Silicon 15.67 % Si 33.52 % SiO₂

Lead 40.14 % Pb 43.24 % PbO

Oxygen 27.89 % O

______ ______

100.00 % 99.47 % = TOTAL OXIDE

Empirical Formula:

PbCa_1.99Mn²⁺_0.08Si_2.88O₉

Environment:

In a metamorphosed stratiform zinc deposit.

IMA Status:

Valid Species (Pre-IMA) 1916

Locality:

Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "pearl" and "tablet", in reference to its luster and lamellar habit.

Name Pronunciation:

Margarosanite + Pronunciation

Synonym:

ICSD 18098

PDF 27-79

Margarosanite Image

Images:

Click Here for Larger Margarosanite Image

Margarosanite Minehillite Wollastonite-1A

Comments: White pearly crystalline minehillite with white margarosanite and dark gray lead, in pale pink opaque wollastonite (distinguished by blue-white fluorescence).
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Margarosanite

Comments: Clear or white, long, thin bladed crystals of margarosanite on matrix.
Location: Langban, Varmland, Sweden. Scale: Crystal size 1cm.
© Tom Loomis / Dakota Matrix

Margarosanite Crystallography

Axial Ratios:

a:b:c =0.7068:1:0.7016

Cell Dimensions:

a = 6.768, b = 9.575, c = 6.718, Z = 2; alpha = 110.36°, beta = 102.98°, gamma = 83.02° V = 394.78 Den(Calc)= 4.34

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.989(1), 3.034(0.91), 5.097(0.8),

Crystal Structure:

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Freed R L , Peacor D R , Zeitschrift fur Kristallographie , 128 (1969) p.213-228, Determination and refinement of the crystal structure of margarosanite,, PbCa2Si3O9, Locality: Parker Shaft, North Mine Hill, Franklin, New Jersey, USA

Physical Properties of Margarosanite

Cleavage:

{???} Perfect, {???} Imperfect, {???} Imperfect

Color:

Colorless, Pearl white.

Density:

3.99 - 4.33, Average = 4.16

Diaphaneity:

Transparent

Habit:

Cleaveable - Easily cleaved into fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Fluorescent, Short UV=red sky blue, Long UV=red orange.

Luster:

Pearly

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Margarosanite

Gladstone-Dale:

CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1772,KPDmeas= 0.184,KC= 0.1748
Ncalc = 1.7 - 1.76

Optical Data:

Biaxial (-), a=1.727, b=1.771, g=1.798, bire=0.0710

Calculated Properties of Margarosanite

Electron Density:

Bulk Density (Electron Density)=3.95 gm/cc
note: Specific Gravity of Margarosanite =4.32 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_{Margarosanite}= 676.49 barns/electron
U=PE_{Margarosanite} x rElectron Density=2,673.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Margarosanite is Not Radioactive

Margarosanite Classification

Dana Class:

59.01.02.02 (59)Cyclosilicate Three-Membered Rings

(59.01)anhydrous, no other anions

(59.01.02)Walstromite group

59.01.02.01 Walstromite BaCa2Si3O9 P1 1

59.01.02.02 Margarosanite Pb(Ca,Mn)2Si3O9 P1 1

Strunz Class:

09.CA.25 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CA -[Si3O9]6- 3-membered single rings (dreier-Einfachringe),

09.CA.25 Margarosanite Pb(Ca,Mn)2Si3O9 P1 1

09.CA.25 Walstromite BaCa2Si3O9 P1 1

Other Margarosanite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Margarosanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Margarosanite

Pb(Ca,Mn++)2Si3O9
Dana No: 59.01.02.02 Strunz No: 09.CA.25
Locality:

Notes: