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.

Name Pronunciation:

Penobsquisite + Pronunciation

Synonym:

ICSD 82484

IMA1995-014

PDF 49-1868

Penobsquisite Image

Images:

Penobsquisite

Comments: Clear crystal of penobsquisite.
Location: Inder B deposit and salt dome, Atyrau Oblysy, Kazakhstan. Scale: Crystal Size 7x6x4 mm.
© Sergey Vasiliev / Systematic Mineralogy

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:

Mouse
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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

Diaphaneity:

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
Ncalc = 1.55 - 1.56

Optical Data:

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

Calculated Properties of Penobsquisite

Electron Density:

Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Penobsquisite =2.29 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Penobsquisite is Not Radioactive

Penobsquisite Classification

Dana Class:

26.05.17.04 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.17)Pringleite Group

26.05.17.01 Pringleite Ca9B26O34(OH)24Cl4•13(H2O) P1 1

26.05.17.02 Ruitenbergite Ca9B26O34(OH)24Cl4•13(H2O) P 2₁ 2

26.05.17.03 Brianroulstonite! Ca3[B5O6(OH)6](OH)Cl2•8(H2O) Pa m

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

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

Strunz Class:

06.GB.10 06 - BORATES

06.G - Heptaborates and other Megaborates

06.GB -Phyllo-nonborates, etc.

06.GB.10 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Penobsquisite

Ca2Fe++[B9O13(OH)6]Cl•4(H2O)
Dana No: 26.05.17.04 Strunz No: 06.GB.10
Locality:

Notes: