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Penobsquisite

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Formula:
Ca2Fe2+[B9O13(OH)6]Cl · 4H2O
Colour:
Pale yellow
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.26
Crystal System:
Monoclinic
Name:
Named for the town of Penobsquis, New Brunswick, Canada, near the type locality. Pronounced penob'skwisait.
This page provides mineralogical data about Penobsquisite.


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Classification of PenobsquisiteHide

Approved
First Published:
1996
6.GB.10

6 : BORATES
G : Heptaborates and other megaborates
B : Phyllo-nonborates, etc.

Physical Properties of PenobsquisiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Pale yellow
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.26 g/cm3 (Measured)    2.27 g/cm3 (Calculated)

Optical Data of PenobsquisiteHide

Type:
Biaxial (+/-)
RI values:
nα = 1.550 nβ = 1.554 nγ = 1.592
Max Birefringence:
δ = 0.042
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v strong

Chemical Properties of PenobsquisiteHide

Formula:
Ca2Fe2+[B9O13(OH)6]Cl · 4H2O

Crystallography of PenobsquisiteHide

Crystal System:
Monoclinic
Morphology:
Unusual morphology. Equidimensional to tabular on {100}, often slightly elongate on [010], triangular in shape.

Forms observed include pinacoids {100}, {101} and {l0-1}, and the sphenoids {111}, {110}, {l-10}, {-2-12} and {-1-12}.
Twinning:
None observed

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005500PenobsquisiteGrice J D, Gault R A, Van Velthuizen J (1996) Penobsquisite: A new borate mineral with a complex framework structure The Canadian Mineralogist 34 657-66519960293
CIF Raw Data - click here to close

Geological EnvironmentHide

Paragenetic Mode(s):
•  Evaporite

Type Occurrence of PenobsquisiteHide

General Appearance of Type Material:
Euhedral crystals to 1.5 mm, found as residue obtained from the dissolution of a halite drill-core.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, catalogue number CMNMI 81524.
Geological Setting of Type Material:
Potash and halite deposit
Associated Minerals at Type Locality:
Reference:
Grice, J.D., Gault, R.A., Van Velthuizen, J. (1996) Penobsquisite: a new borate mineral with a complex framework structure. Canadian Mineralogist (1996): 34: 657-665.

Synonyms of PenobsquisiteHide

Other Language Names for PenobsquisiteHide

Related Minerals - Nickel-Strunz GroupingHide

6.GB.05StudenitsiteNaCa2[B9O14(OH)4] · 2H2OMon.
6.GB.15PreobrazhenskiteMg3B11O15(OH)9Orth.
6.GB.20WalkeriteCa16(Mg,Li,◻)2[B13O17(OH)12]4Cl6·28H2OOrth. mm2 : Pba2

Fluorescence of PenobsquisiteHide

None observed.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for PenobsquisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grice, J.D., Gault, R.A., Van Velthuizen, J. (1996) Penobsquisite: a new borate mineral with a complex framework structure. Canadian Mineralogist (1996): 34: 657-665.
Jambor, J.L., Roberts, A.C. (1997) New mineral names. American Mineralogist: 82: 207-210.
Grice, J.D., Gault, R.A., Van Velthuizen, J.J. (2005) Borate minerals from the Penobsquis and Millstream deposits, Southern New Brunswick, Canada. Canadian Mineralogist: 43: 1469-1487.
Grew, E.S., Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for PenobsquisiteHide

Localities for PenobsquisiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
 
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
        • Penobsquis
Grice, J.D., Gault, R.A., Van Velthuizen, J. (1996) Penobsquisite: a new borate mineral with a complex framework structure. The Canadian Mineralogist: 34(3): 657-665.
      • Hammond Parish
        • Salt Springs evaporite deposit
BURNS, P.C., HAWTHORNE, F.C. & STIRLING, J.A.R. (1992): Trembathite, (Mg,Fe)3B7O13Cl, a new borate mineral from the Salt Springs potash deposit, Sussex, New Brunswick. Canadian Mineralogist 30, 445-448.
 
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