Ashburtonite Mineral Data

General Ashburtonite Information

Chemical Formula:

HPb4Cu++4Si4O12(HCO3)4(OH)4Cl

Composition:

Molecular Weight = 1,735.88 gm

Copper 14.64 % Cu 18.33 % CuO

Silicon 6.47 % Si 13.85 % SiO₂

Hydrogen 0.52 % H 4.67 % H₂O

Lead 47.75 % Pb 51.43 % PbO

Carbon 2.77 % C 10.14 % CO₂

Chlorine 2.04 % Cl 2.04 % Cl

- % Cl -0.46 % -O=Cl₂

Oxygen 25.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

HPb₄Cu₄Si₄O₁₂(HCO₃)₄(OH)₄Cl

Environment:

Secondary minerals in a weathered shear zone that cuts a series of shales and graywackes.

IMA Status:

Approved IMA 1989

Locality:

Anticline prospect, on Mineral Claim 84, which is on the Ashburton Downs pastoral lease, 11.2 km west-southwest of Ashburton Downs homestead. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Ashburtonite + Pronunciation

Synonym:

ICSD 80794

IMA1990-033

PDF 44-1406

Ashburtonite Image

Images:

Ashburtonite

Comments: Blue-green crystalline crust of ashburtonite on matrix.
Location: Anticline Deposit, Ashburton Downs, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ashburtonite Crystallography

Axial Ratios:

a:c = 1:0.42876

Cell Dimensions:

a = 14.234, c = 6.103, Z = 2; V = 1,236.51 Den(Calc)= 4.66

Crystal System:

Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 4/m

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

By Intensity(I/I_o): 3.333(1), 4.495(1), 10.2(1),

Physical Properties of Ashburtonite

Cleavage:

None

Color:

Blue.

Density:

4.69

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

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

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light blue

Optical Properties of Ashburtonite

Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1702,KPDmeas= 0.1691,KC= 0.1721
Ncalc = 1.8 - 1.81

Optical Data:

Uniaxial (+), w=1.786, e=1.8, bire=0.0140.

Calculated Properties of Ashburtonite

Electron Density:

Bulk Density (Electron Density)=4.16 gm/cc
note: Specific Gravity of Ashburtonite =4.66 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Ashburtonite= 829.28 barns/electron
U=PE_Ashburtonite x rElectron Density=3,446.20 barns/cc.

Radioactivity:

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

Ashburtonite Classification

Dana Class:

78.04.02.01 (78)Unclassified silicates

(78.04)possible inosilicates

(78.04.02)Dana Group

78.04.02.01 Ashburtonite HPb4Cu4Si4O12(HCO3)4(OH)4Cl I 4/m 4/m

Strunz Class:

09.CF.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CF -[Si4O12]8- 4-membered single rings, with insular complex anions

09.CF.05 Ashburtonite HPb4Cu4Si4O12(HCO3)4(OH)4Cl I 4/m 4/m

Other Ashburtonite Information

References:

NAME( AmMin, v76:1701) PHYS. PROP.(Am.Min.,Vol.76,p1701-1707,1991) OPTIC PROP.(Am.Min.,Vol.76,p1701-1707,1991)

See Also:

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

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

Ashburtonite

HPb4Cu++4Si4O12(HCO3)4(OH)4Cl
Dana No: 78.04.02.01 Strunz No: 09.CF.05
Locality:

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