Pringleite Mineral Data

Pringleite Mineral Data +

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General Pringleite Information

Chemical Formula:

Ca9B26O34(OH)24Cl4·13(H2O)

Composition:

Molecular Weight = 1,969.93 gm

Calcium 18.31 % Ca 25.62 % CaO

Boron 14.27 % B 45.94 % B₂O₃

Hydrogen 2.56 % H 22.86 % H₂O

Chlorine 7.20 % Cl 7.20 % Cl

- % Cl -1.62 % -O=Cl₂

Oxygen 57.66 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₉B₂₆O₃₄(OH)₂₄Cl₄·13(H₂O)

IMA Status:

Approved IMA 1993

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 76888

IMA1992-010

PDF 46-1428

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Pringleite Crystallography

Axial Ratios:

a:b:c =0.9769:1:0.7452

Cell Dimensions:

a = 12.759, b = 13.06, c = 9.733, Z = 1; alpha = 102.14°, beta = 102.03°, gamma = 85.68° V = 1,546.34 Den(Calc)= 2.12

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 7.69(1), 9.21(0.7), 5.74(0.6),

Crystal Structure:

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Grice J D , Burns P C , Hawthorne F C , The Canadian Mineralogist , 32 (1994) p.1-14, Determination of the megastructures of the borate polymorphs pringleite and, ruitenbergite, Note: Cell angles modified by Grice, June 2002

Physical Properties of Pringleite

Cleavage:

[???] Good

Color:

Colorless, Light yellow, Orange.

Density:

2.21

Diaphaniety:

Transparent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pringleite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2602,KPDmeas= 0.2496,KC= 0.2531

Optical Data:

Biaxial (+), a=1.537, b=1.548, g=1.57, bire=0.0330, 2V(Calc)=72, 2V(Meas)=71.4-77.

Calculated Properties of Pringleite

Electron Density:

r_electron=2.23 gm/cc
note: r_Pringleite=2.21 gm/cc.

Fermion Index

Fermion Index = 0.02892
Boson Index = 0.97108

Photoelectric:

PE_Pringleite= 2.90 barns/electron
U=PE_Pringleite x r_electron= 6.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pringleite is Not Radioactive

Pringleite Classification

Dana Class:

26.5.17.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.5)Dana Type

(26.5.17)Dana Group

26.5.17.1 Pringleite Ca9B26O34(OH)24Cl4·13(H2O) P1 1

26.5.17.2 Ruitenbergite Ca9B26O34(OH)24Cl4·13(H2O) P 2₁ 2

26.5.17.3 Brianroulstonite! Ca3[B5O6(OH)6](OH)Cl2·8(H2O) Pa m

26.5.17.4 Penobsquisite! Ca2Fe[B9O13(OH)6]Cl·4(H2O) P 2₁ 2

26.5.17.5 Walkerite! Ca16(Mg,Li,[])2[B13O17(OH)12]4Cl6·28(H2O) Pba2 mm2

Strunz Class:

V/K.09-10 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.09 - Pringleite - Ruitenbergite series

V/K.09-05 Brianroulstonite! Ca3[B5O6(OH)6](OH)Cl2·8(H2O) Pa m

V/K.09-10 Pringleite Ca9B26O34(OH)24Cl4·13(H2O) P1 1

V/K.09-20 Ruitenbergite Ca9B26O34(OH)24Cl4·13(H2O) P 2₁ 2

V/K.09-25 Walkerite! Ca16(Mg,Li,[])2[B13O17(OH)12]4Cl6·28(H2O) Pba2 mm2

V/K.09-30 Penobsquisite! Ca2Fe[B9O13(OH)6]Cl·4(H2O) P 2₁ 2

Other Pringleite Information

References:

PHYS. PROP.(Am.Min.,Vol.79,p1011,1994) OPTIC PROP.(Am.Min.,Vol.79,p1011,1994)

See Also:

Links to other databases for Pringleite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Pringleite

Ca9B26O34(OH)24Cl4·13(H2O)
Dana No: 26.5.17.1 Strunz No: V/K.09-10
Locality:

Notes: