Penobsquisite
A valid IMA mineral species
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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.
Unique Identifiers
Mindat ID:
7223
Long-form identifier:
mindat:1:1:7223:2
GUID
(UUID V4):
(UUID V4):
5b4879f4-68a1-4876-aa08-310b4942a7db
IMA Classification of Penobsquisite
Approved
First published:
1996
Classification of Penobsquisite
6.GB.10
6 : BORATES
G : Heptaborates and other megaborates
B : Phyllo-nonborates, etc.
6 : BORATES
G : Heptaborates and other megaborates
B : Phyllo-nonborates, etc.
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Pnb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Penobsquisite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Pale yellow
Streak:
White
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.26(3) g/cm3 (Measured) 2.27 g/cm3 (Calculated)
Optical Data of Penobsquisite
Type:
Biaxial (+/-)
RI values:
nα = 1.550(2) nβ = 1.554(2) nγ = 1.592(2)
2V:
Measured: 33° (2), Calculated: 37°
Max Birefringence:
δ = 0.042
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
None.
Optical Extinction:
Y = b; Z ∧ C = 16.6° in obtuse angle beta.
Pleochroism:
Not Visible
Chemistry of Penobsquisite
Mindat Formula:
Ca2Fe2+[B9O13(OH)6]Cl · 4H2O
Crystallography of Penobsquisite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 11.620(3) Å, b = 9.407(2) Å, c = 8.726(1) Å
β = 95.58(2)°
β = 95.58(2)°
Ratio:
a:b:c = 1.235 : 1 : 0.928
Unit Cell V:
949.31 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Unusual morphology. Equidimensional to tabular on {100}, often slightly elongate on [010], triangular in shape.
Forms observed include pinacoids {100}, {101} and {l01}, and the sphenoids {111}, {110}, {l10}, {212} and {112}.
Forms observed include pinacoids {100}, {101} and {l01}, and the sphenoids {111}, {110}, {l10}, {212} and {112}.
Twinning:
None observed
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005500 | Penobsquisite | Grice J D, Gault R A, Van Velthuizen J (1996) Penobsquisite: A new borate mineral with a complex framework structure The Canadian Mineralogist 34 657-665 | 1996 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.65 Å | (30) |
7.29 Å | (100) |
5.32 Å | (20) |
4.50 Å | (20) |
2.958 Å | (30) |
2.744 Å | (20) |
2.113 Å | (30) |
Comments:
Potash Corporation of Saskatchewan Mine, New Brunswick, Canada. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
25 : Evaporites (prebiotic) |
Type Occurrence of Penobsquisite
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 Penobsquisite
Other Language Names for Penobsquisite
Related Minerals - Strunz-mindat Grouping
6.GB.05 | Studenitsite | NaCa2[B9O14(OH)4] · 2H2O |
6.GB.15 | Preobrazhenskite | Mg3B11O15(OH)9 |
6.GB.20 | Walkerite | Ca16(Mg,Li,◻)2[B13O17(OH)12]4Cl6 · 28H2O |
Fluorescence of Penobsquisite
None observed.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Penobsquisite
mindat.org URL:
https://www.mindat.org/min-7223.html
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Please feel free to link to this page.
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References for Penobsquisite
Reference List:
Localities for Penobsquisite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Canada (TL) | |
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