Minyulite Mineral Data

Minyulite Mineral Data +

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General Minyulite Information

Chemical Formula:

KAl2(PO4)2(OH,F)·4(H2O)

Composition:

Molecular Weight = 372.57 gm

Potassium 10.49 % K 12.64 % K₂O

Aluminum 14.48 % Al 27.37 % Al₂O₃

Phosphorus 16.63 % P 38.10 % P₂O₅

Hydrogen 2.37 % H 21.15 % H₂O

Oxygen 54.75 % O

Fluorine 1.27 % F 1.27 % F

- % F -0.54 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KAl₂(PO₄)₂(OH)_0.75F_0.25·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

Minyulo Well in western Australia. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 100036

PDF 37-371

Minyulite Image

Images:

Minyulite

Comments: Crystals of minyulite on matrix.
Location: St. John's Quarry, Kapunda, South Australia. Scale: Crystal size 4-5 mm to 5 mm.
© John Veevaert

Images:

Minyulite Sincosite

Comments: Pale greenish white acicular radial sprays of minyulite to 8mm with small, green, tabular sincosite.
Location: Ross Hannibal mine, Lawrence County, South Dakota. Scale: Picture size 2 cm.
© Tom Loomis / Dakota Matrix

Minyulite Crystallography

Axial Ratios:

a:b:c =0.9586:1:0.5669

Cell Dimensions:

a = 9.337, b = 9.74, c = 5.522, Z = 2; V = 502.18 Den(Calc)= 2.46

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pba2

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

By Intensity(I/I_o): 3.38(1), 5.6(1), 6.8(0.6),

Crystal Structure:

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Kampf A R , American Mineralogist , 62 (1977) p.256-262, Minyulite: its atomic arrangement

Physical Properties of Minyulite

Cleavage:

[001] Perfect

Color:

Colorless, Green, White, Light green.

Density:

2.46

Diaphaniety:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3.5 - Copper Penny

Luster:

Silky

Streak:

white

Optical Properties of Minyulite

Gladstone-Dale:

CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2172,KPDmeas= 0.2172,KC= 0.2237

Optical Data:

Biaxial (+), a=1.531, b=1.534, g=1.538, bire=0.0070, 2V(Calc)=82, 2V(Meas)=70.

Calculated Properties of Minyulite

Electron Density:

r_electron=2.48 gm/cc
note: r_Minyulite=2.46 gm/cc.

Fermion Index

Fermion Index = 0.00027
Boson Index = 0.99973

Photoelectric:

PE_Minyulite= 2.30 barns/electron
U=PE_Minyulite x r_electron= 5.71 barns/cc.

Radioactivity:

GRapi = 152.82 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Minyulite - barely detectable

Minyulite Classification

Dana Class:

42.11.5.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.5)Dana Group

42.11.5.1 Minyulite KAl2(PO4)2(OH,F)·4(H2O) Pba2 mm2

Strunz Class:

VII/D.27-40 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.27 - Tinsleyite - Minyulite series

VII/D.27-10 Tinsleyite KAl2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

VII/D.27-20 Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

VII/D.27-30 Leucophosphite KFe2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

VII/D.27-40 Minyulite KAl2(PO4)2(OH,F)·4(H2O) Pba2 mm2

Other Minyulite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Minyulite

KAl2(PO4)2(OH,F)·4(H2O)
Dana No: 42.11.5.1 Strunz No: VII/D.27-40
Locality:

Notes: