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Taranakite Mineral Data
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General Taranakite Information
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Chemical Formula: |
K3Al5(HPO4)6(PO4)2•18(H2O) |
Composition: |
Molecular Weight = 1,342.30 gm |
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Potassium 8.74 % K 10.53 % K2O |
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Aluminum 10.05 % Al 18.99 % Al2O3 |
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Phosphorus 18.46 % P 42.30 % P2O5 |
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Hydrogen 3.15 % H 28.18 % H2O |
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Oxygen 59.60 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
K3Al5(HPO4)6(PO4)2•18(H2O) |
Environment: |
Formed from phosphatic solutions derived from bird or bat guano reacting with clays or aluminous rocks under perenially damp conditions |
IMA Status: |
Valid Species (Pre-IMA) 1882 |
Locality: |
Sugarloaves, near New Plymouth, Taranaki Peninsula, New Zealand. Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality. |
Name Pronunciation: |
Taranakite + Pronunciation |
Synonym: |
ICSD 85750 |
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PDF 29-981 |
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Taranakite Image |
Images:
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Taranakite Crystallography
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Axial Ratios: |
a:c = 1:10.92214 |
Cell Dimensions: |
a = 8.7025, c = 95.05, Z = 6; V = 6,234.06 Den(Calc)= 2.15 |
Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c |
X Ray Diffraction: |
By Intensity(I/Io): 15.5(1), 3.83(0.8), 7.6(0.8), |
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Physical Properties of Taranakite
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Color: |
Gray white, Yellowish white, White. |
Density: |
2.09 |
Hardness: |
1-2 - Between Talc and Gypsum |
Luminescence: |
Non-Fluorescent. |
Streak: |
white |
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Optical Properties of Taranakite
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Optical Data: |
NCalc= 1.5 - from Gladstone-Dale relationship (KC = 0.2332) where Ncalc=Dcalc*KC+1 NCalc= 1.49 - from Gladstone-Dale relationship (KC = 0.2332) where Ncalc=Dmeas*KC+1
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Calculated Properties of Taranakite
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Electron Density: |
Bulk Density (Electron Density)=2.19 gm/cc note: Specific Gravity of Taranakite =2.15 gm/cc. |
Fermion Index: |
Fermion Index = 0.000301283 Boson Index = 0.999698717 |
Photoelectric: |
PETaranakite = 2.09 barns/electron U=PETaranakite x relectron= 4.58 barns/cc. |
Radioactivity: |
GRapi = 128.51 (Gamma Ray American Petroleum Institute Units)
Concentration of Taranakite per GRapi unit = 0.78 (%)
Estimated Radioactivity from Taranakite - barely detectable
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Taranakite Classification
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Dana Class: |
39.03.06.01 (39)Hydrated Acid Phosphates, etc |
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(39.03)with miscellaneous formulae |
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(39.03.06)Dana Group |
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39.03.06.01 Taranakite K3Al5(HPO4)6(PO4)2•18(H2O) R 3c 3 2/m |
Strunz Class: |
08.CH.25 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.C - Phosphates without Additional Anions, with H2O |
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08.CH -With large and medium-sized cations, RO4:H2O < 1:1 |
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08.CH.25 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8•13(H2O) R 3c or R 3c Trig |
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08.CH.25 Taranakite K3Al5(HPO4)6(PO4)2•18(H2O) R 3c 3 2/m |
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Other Taranakite Information
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References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Taranakite :
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
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Print or Cut-and-Paste your Taranakite Specimen Label here :
Taranakite
K3Al5(HPO4)6(PO4)2•18(H2O)
Dana No: 39.03.06.01 Strunz No: 08.CH.25
Locality:
Notes:
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