Shannonite Mineral Data

General Shannonite Information

Chemical Formula:

Pb2OCO3

Composition:

Molecular Weight = 490.41 gm

Lead 84.50 % Pb 91.03 % PbO

Carbon 2.45 % C 8.97 % CO₂

Oxygen 13.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂O(CO₃)

Environment:

In silicified breccia.

IMA Status:

Approved IMA 1993 (Dana # Added)

Locality:

Grand Reef mine, Graham County, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

For David M. Shannon (1942- ), a mineral dealer who helped collect the first samples of the mineral.

Name Pronunciation:

Shannonite + Pronunciation

Synonym:

IMA1993-053

Shannonite Crystallography

Axial Ratios:

a:b:c =1.0326:1:0.5703

Cell Dimensions:

a = 9.294, b = 9, c = 5.133, Z = 5; V = 429.35 Den(Calc)= 9.48

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2)

Physical Properties of Shannonite

Cleavage:

None

Color:

White.

Density:

9.31

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Porcelainous - Fine-grained, translucent massive material like broken china

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Waxy

Streak:

white

Optical Properties of Shannonite

Gladstone-Dale:

CI meas= 0.504 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.513 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.0682,KPDmeas= 0.0695,KC= 0.14
Ncalc = 2.3 - 2.33

Optical Data:

Biaxial (+), a=1.642, b=1.645, g=1.654, bire=0.0120, 2V(Calc)=62, 2V(Meas)=52.

Calculated Properties of Shannonite

Electron Density:

Bulk Density (Electron Density)=7.67 gm/cc
note: Specific Gravity of Shannonite =9.31 gm/cc.

Fermion Index:

Fermion Index = 0.18
Boson Index = 0.82

Photoelectric:

PE_Shannonite=1,574.65 barns/electron
U=PE_Shannonite x rElectron Density=12076.92 barns/cc.

Radioactivity:

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

Shannonite Classification

Dana Class:

16a.03.10.01 (16a)Carbonates - Hydroxyl or Halogen

(16a.03)where (A B)2 (XO3) Zq

(16a.03.10)Dana Group

16a.03.10.01 Shannonite! Pb2OCO3 2 2 2

Strunz Class:

05.BE.05 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BE -With Pb, Bi

05.BE.05 Shannonite! Pb2OCO3 2 2 2

Other Shannonite Information

References:

NAME( MinRec) PHYS. PROP.(MinRec) OPTIC PROP.(Am.Min.,Vol.81,1996)

See Also:

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

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

Shannonite

Pb2OCO3
Dana No: 16a.03.10.01 Strunz No: 05.BE.05
Locality:

Notes:

Dakota Matrix
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