Margarosanite Mineral Data

Margarosanite Mineral Data +

General Margarosanite Information

Chemical Formula:

Pb(Ca,Mn++)2Si3O9

Composition:

Molecular Weight = 523.04 gm

Calcium 11.49 % Ca 16.08 % CaO

Manganese 5.25 % Mn 6.78 % MnO

Silicon 16.11 % Si 34.46 % SiO₂

Lead 39.61 % Pb 42.67 % PbO

Oxygen 27.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbCa_1.5Mn²⁺_0.5Si₃O₉

IMA Status:

Valid Species (Pre-IMA) 1916

Locality:

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

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)= 4.40

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaniety:

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:

Non-fluorescent.

Luster:

Pearly

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Margarosanite

Gladstone-Dale:

CI meas= -0.093 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1739,KPDmeas= 0.1918,KC= 0.1756

Optical Data:

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

Calculated Properties of Margarosanite

Electron Density:

r_electron=4.01 gm/cc
note: r_{Margarosanite}=4.40 gm/cc.

Fermion Index

Fermion Index = 0.09535
Boson Index = 0.90465

Photoelectric:

PE_{Margarosanite}= 670.45 barns/electron
U=PE_{Margarosanite} x r_electron=2,690.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Margarosanite is Not Radioactive

Margarosanite Classification

Dana Class:

59.1.2.2 (59)Cyclosilicate Three-Membered Rings

(59.1)anhydrous, no other anions

(59.1.2)Walstromite group

59.1.2.1 Walstromite BaCa2Si3O9 P1 1

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

Strunz Class:

VIII/E.02-20 VIII - Silicates

VIII/E - Cyklosilicates, triplet rings [Si3O9]6-

VIII/E.02 - Walstromite - Mathewrogersite series

VIII/E.02-10 Walstromite BaCa2Si3O9 P1 1

VIII/E.02-20 Margarosanite Pb(Ca,Mn)2Si3O9 P1 1

VIII/E.02-30 Roeblingite Pb2Ca6(Si6O18)(SO4)2(OH)2·4(H2O) C 2/m 2/m

VIII/E.02-40 Mathewrogersite Pb7(Fe,Cu)Al3GeSi12O36·(OH,H2O)6 R 3,R 3-,R 32,R 3m,R 3m- Trig

Other Margarosanite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Search for Margarosanite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Margarosanite :

AA Mineral Specimens

B & L Fine Minerals

Crystal Vaults

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

Rockshop.cz

T G Fine Minerals

Wrights Rock Shop

Translate Margarosanite Mineral Data :

Ask about Margarosanite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Margarosanite Specimen Label here :

Margarosanite

Pb(Ca,Mn++)2Si3O9
Dana No: 59.1.2.2 Strunz No: VIII/E.02-20
Locality:

Notes: