Penobsquisite Mineral Data

Penobsquisite Mineral Data +

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General Penobsquisite Information

Chemical Formula:

Ca2Fe++[B9O13(OH)6]Cl·4(H2O)

Composition:

Molecular Weight = 650.84 gm

Calcium 12.32 % Ca 17.23 % CaO

Iron 8.58 % Fe 11.04 % FeO

Boron 14.95 % B 48.13 % B₂O₃

Hydrogen 2.17 % H 19.38 % H₂O

Chlorine 5.45 % Cl 5.45 % Cl

- % Cl -1.23 % -O=Cl₂

Oxygen 56.54 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Fe²⁺B₉O₁₃(OH)₆Cl·4(H₂O)

Environment:

Upper Halite member of the evaporite sequence.

IMA Status:

Approved IMA 1994 (Dana # Added)

Locality:

Potash Corporation of Saskatchewan (New Brunswick Division) mine at Penobsquis, Kings County, New Brunswick, Canada. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

ICSD 82484

IMA1995-014

PDF 49-1868

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Penobsquisite Crystallography

Axial Ratios:

a:b:c =1.2398:1:0.9312

Cell Dimensions:

a = 11.63, b = 9.38, c = 8.735, Z = 2; beta = 98.4° V = 942.67 Den(Calc)= 2.29

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 7.29(1)(110), 2.113(0.3)(114), 8.65(0.3)(001),2.958(0.3)(320,312,031), 4.5(0.2)(211), 5.32(0.2)(111),

Crystal Structure:

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Grice J D , Gault R A , Van Velthuizen J , The Canadian Mineralogist , 34 (1996) p.657-665, Penobsquisite: A new borate mineral with a complex framework structure

Physical Properties of Penobsquisite

Cleavage:

None

Color:

Pale yellow.

Density:

2.26

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Penobsquisite

Gladstone-Dale:

CI meas= -0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2469,KPDmeas= 0.2501,KC= 0.2435

Optical Data:

Biaxial (+/-), a=1.55, b=1.554, g=1.592, bire=0.0420

Calculated Properties of Penobsquisite

Electron Density:

r_electron=2.29 gm/cc
note: r_{Penobsquisite}=2.29 gm/cc.

Fermion Index

Fermion Index = 0.032
Boson Index = 0.968

Photoelectric:

PE_{Penobsquisite}= 4.57 barns/electron
U=PE_{Penobsquisite} x r_electron= 10.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Penobsquisite is Not Radioactive

Penobsquisite Classification

Dana Class:

26.5.17.4 (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.09-30 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 Penobsquisite Information

References:

NAME( CanMin) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(Eur. J. Min.,Vol.8,1996)

See Also:

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

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Penobsquisite

Ca2Fe++[B9O13(OH)6]Cl·4(H2O)
Dana No: 26.5.17.4 Strunz No: V/K.09-30
Locality:

Notes: