Ganomalite Mineral Data

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General Ganomalite Information

Chemical Formula:

Pb9Ca5Mn++Si9O33

Composition:

Molecular Weight = 2,900.88 gm

Calcium 6.91 % Ca 9.67 % CaO

Manganese 1.89 % Mn 2.45 % MnO

Silicon 8.71 % Si 18.64 % SiO₂

Lead 64.28 % Pb 69.25 % PbO

Oxygen 18.20 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₉Ca₅Mn²⁺Si₉O₃₃

Environment:

In skarn assemblages (Jakobsberg, Sweden); in manganese ores in a metamorphosed stratiform zinc orebody (Franklin, New Jersey, USA).

IMA Status:

Valid Species (Pre-IMA) 1876

Locality:

Jakobsberg, Vermland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for luster, in allusion to its appearance.

Name Pronunciation:

Ganomalite + Pronunciation

Synonym:

ICSD 50268

PDF 25-150

Ganomalite Image

Images:

Ganomalite Jacobsite

Comments: White crystalline ganomalite with dark granular jacobsite.
Location: Jacobsberg, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ganomalite Crystallography

Axial Ratios:

a:c = 1:1.03156

Cell Dimensions:

a = 9.82, c = 10.13, Z = 1; V = 845.99 Den(Calc)= 5.69

Crystal System:

Trigonal - PyramidalH-M Symbol (3) Space Group: P 3

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

By Intensity(I/I_o): 3.06(1), 3.53(0.9), 3.38(0.8),

Crystal Structure:

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Dunn P J , Peacor D R , Valley J W , Randall C A , Mineralogical Magazine , 49 (1985) p.579-582, Ganomalite from Franklin, New Jersey, and Jakobsberg, Sweden:, New chemical and crystallographic data, Note: structure from ICSD

Physical Properties of Ganomalite

Cleavage:

{???} Good

Color:

Colorless, Gray, White.

Density:

5.74

Diaphaneity:

Translucent to transparent

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

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

Hardness:

3 - Calcite

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Ganomalite

Gladstone-Dale:

CI meas= -0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.163,KPDmeas= 0.1616,KC= 0.156
Ncalc = 1.89 - 1.9

Optical Data:

Uniaxial (+), w=1.91, e=1.945, bire=0.0350.

Calculated Properties of Ganomalite

Electron Density:

Bulk Density (Electron Density)=4.96 gm/cc
note: Specific Gravity of Ganomalite =5.74 gm/cc.

Fermion Index:

Fermion Index = 0.14
Boson Index = 0.86

Photoelectric:

PE_Ganomalite=1,144.22 barns/electron
U=PE_Ganomalite x rElectron Density=5,673.78 barns/cc.

Radioactivity:

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

Ganomalite Classification

Dana Class:

78.02.01.01 (78)Unclassified silicates

(78.02)possible sorosilicates

(78.02.01)Dana Group

78.02.01.01 Ganomalite Pb9Ca5MnSi9O33 P 3 3

Strunz Class:

09.BG.25 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.25 Ganomalite Pb9Ca5MnSi9O33 P 3 3

Other Ganomalite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

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

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Ask about Ganomalite here :
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Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
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Print or Cut-and-Paste your Ganomalite Specimen Label here :

Ganomalite

Pb9Ca5Mn++Si9O33
Dana No: 78.02.01.01 Strunz No: 09.BG.25
Locality:

Notes: