Tarbuttite Mineral Data

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.

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

Diaphaniety:

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:

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

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.

Pleochroism (z):

colorless.

Calculated Properties of Tarbuttite

Electron Density:

r_electron=3.96 gm/cc
note: r_Tarbuttite=4.14 gm/cc.

Fermion Index

Fermion Index = 0.02224
Boson Index = 0.97776

Photoelectric:

PE_Tarbuttite= 27.58 barns/electron
U=PE_Tarbuttite x r_electron= 109.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tarbuttite is Not Radioactive

Tarbuttite Classification

Dana Class:

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

(41.6)where (A)2 (XO4) Zq

(41.6.7)Dana Group

41.6.7.1 Tarbuttite Zn2(PO4)(OH) P1 1

41.6.7.2 Paradamite Zn2(AsO4)(OH) P1 1

Strunz Class:

VII/B.06-50 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.06 - Adamite group, Libethenite - Paradamite

VII/B.06-10 Libethenite Cu2(PO4)(OH) Pnnm 2/m 2/m 2/m

VII/B.06-20 Olivenite Cu2AsO4(OH) P 2₁/n 2/m

VII/B.06-30 Adamite Zn2(AsO4)(OH) Pnnm 2/m 2/m 2/m

VII/B.06-40 Eveite Mn2(AsO4)(OH) Pnnm 2/m 2/m 2/m

VII/B.06-50 Tarbuttite Zn2(PO4)(OH) P1 1

VII/B.06-60 Paradamite Zn2(AsO4)(OH) P1 1

Other Tarbuttite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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

Tarbuttite

Zn2(PO4)(OH)
Dana No: 41.6.7.1 Strunz No: VII/B.06-50
Locality:

Notes: