Tarbuttite Mineral Data
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 % P2 O5
Hydrogen 0.42 % H 3.71 % H2 O
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 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 - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 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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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:
PETarbuttite = 27.58 barns/electronU=PETarbuttite x r Electron 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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Tarbuttite
Zn2(PO4)(OH)
Dana No: 41.06.07.01 Strunz No: 08.BB.35
Locality:
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