Tarbuttite Mineral Data

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General Tarbuttite Information

Chemical Formula:

Zn2(PO4)(OH)

Composition:

Molecular Weight = 242.76 gm

Zinc 53.87 % Zn 67.05 % ZnO

Phosphorus 12.76 % P 29.24 % P₂O₅

Hydrogen 0.42 % H 3.71 % H₂O

Oxygen 32.95 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₂(PO₄)(OH)

Environment:

Secondary mineral in the oxidized portions of Zn-bearing ore zones.

IMA Status:

Valid Species (Pre-IMA) 1907

Locality:

Kabwe, Broken Hill mines, northwestern Zambia. Link to MinDat.org Location Data.

Name Origin:

Named for Percy Coventry Tarbutt, director of the Broken Hill Explaration Co., Zambia.

Name Pronunciation:

Tarbuttite + Pronunciation

Synonym:

Salmoite

Tarbuttite Image

Images:

Tarbuttite

Comments: Clear, prismatic crystal of tarbuttite on matrix.
Location: Broken Hill Mine, Kabwe, Central Zambia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Tarbuttite Crystallography

Axial Ratios:

a:b:c =0.8795:1:0.8583

Cell Dimensions:

a = 5.657, b = 6.432, c = 5.521, Z = 2; alpha = 102.45°, beta = 87.6°, gamma = 102.567° V = 191.29 Den(Calc)= 4.21

Crystal System:

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

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

By Intensity(I/I_o): 2.78(1), 3.7(0.9), 6.12(0.9),

Forms:

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Forms: ( 3 4 7) ( 1 2 1) ( 1 2 1) ( 0 1 0) ( 1 1 0) ( 2 1 0) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Cocco G , Fanfani L , Zanazzi P F , Zeitschrift fur Kristallographie , 123 (1966) p.321-329, The crystal structure of tarbuttite, Zn2(OH)PO4, Locality: Broken Hill, Rhodesia

View Additional jPOWD Structure files for Tarbuttite
[1]

Physical Properties of Tarbuttite

Cleavage:

{010} Perfect

Color:

Brown, Colorless, Green, White, Light yellow.

Density:

4.14

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Hardness:

4 - Fluorite

Luminescence:

Non-Fluorescent.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Tarbuttite

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1645,KPDmeas= 0.1673,KC= 0.1721
Ncalc = 1.71 - 1.72

Optical Data:

Biaxial (-), a=1.66, b=1.705, g=1.713, bire=0.0530, 2V(Calc)=44, 2V(Meas)=50. Dispersion strong.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Calculated Properties of Tarbuttite

Electron Density:

Bulk Density (Electron Density)=3.96 gm/cc
note: Specific Gravity of Tarbuttite =4.14 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Tarbuttite= 27.58 barns/electron
U=PE_Tarbuttite x rElectron Density= 109.11 barns/cc.

Radioactivity:

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

Tarbuttite Classification

Dana Class:

41.06.07.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.06)where (A)2 (XO4) Zq

(41.06.07)Tarbuttite Group

41.06.07.01 Tarbuttite Zn2(PO4)(OH) P1 1

41.06.07.02 Paradamite Zn2(AsO4)(OH) P1 1

Strunz Class:

08.BB.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 £ 1:1

08.BB.35 Paradamite Zn2(AsO4)(OH) P1 1

08.BB.35 Tarbuttite Zn2(PO4)(OH) P1 1

Other Tarbuttite Information

See Also:

Links to other databases for Tarbuttite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
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
16 - WWW-MINCRYST

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

Tarbuttite

Zn2(PO4)(OH)
Dana No: 41.06.07.01 Strunz No: 08.BB.35
Locality:

Notes: