Taranakite Mineral Data

Taranakite Mineral Data +

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General Taranakite Information

Chemical Formula:

K3Al5(HPO4)6(PO4)2·18(H2O)

Composition:

Molecular Weight = 1,342.30 gm

Potassium 8.74 % K 10.53 % K₂O

Aluminum 10.05 % Al 18.99 % Al₂O₃

Phosphorus 18.46 % P 42.30 % P₂O₅

Hydrogen 3.15 % H 28.18 % H₂O

Oxygen 59.60 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₃Al₅(HPO₄)₆(PO₄)₂·18(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1882

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 85750

PDF 29-981

Taranakite Image

Images:

Taranakite

Comments: Bright white chalky powdery taranakite mass.
Location: South Farallon Island, near San Francicso, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Taranakite Crystallography

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 ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c

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

By Intensity(I/I_o): 15.5(1), 3.83(0.8), 7.6(0.8),

Physical Properties of Taranakite

Color:

Gray white, Yellowish white, White.

Density:

2.09

Hardness:

1-2 - Between Talc and Gypsum

Luminescence:

Fluorescent.

Streak:

white

Optical Properties of Taranakite

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

Calculated Properties of Taranakite

Electron Density:

r_electron=2.19 gm/cc
note: r_Taranakite=2.15 gm/cc.

Fermion Index

Fermion Index = 0.0003
Boson Index = 0.9997

Photoelectric:

PE_Taranakite= 2.09 barns/electron
U=PE_Taranakite x r_electron= 4.58 barns/cc.

Radioactivity:

GRapi = 128.51 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Taranakite - barely detectable

Taranakite Classification

Dana Class:

39.3.6.1 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.6)Dana Group

39.3.6.1 Taranakite K3Al5(HPO4)6(PO4)2·18(H2O) R 3c 3 2/m

Strunz Class:

VII/C.21-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.21 - Francoanellite - Taranakite series

VII/C.21-10 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8·13(H2O) R 3c or R 3c Trig

VII/C.21-20 Taranakite K3Al5(HPO4)6(PO4)2·18(H2O) R 3c 3 2/m

VII/C.21-30 Haigerachite! KFe3(H2PO4)6(HPO4)2·4(H2O) C 2/c 2/m

Other Taranakite Information

References:

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

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

Taranakite

K3Al5(HPO4)6(PO4)2·18(H2O)
Dana No: 39.3.6.1 Strunz No: VII/C.21-20
Locality:

Notes: