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Penobsquisite

Formula:
Ca
 
2
Fe
2+
 
[Cl|B
 
9
O
 
13
(OH)
 
6
]Cl · 4H
 
2
O
System:MonoclinicColour:Pale yellow
Lustre:VitreousHardness:3
This page provides mineralogical data about Penobsquisite.

Classification of Penobsquisite

IMA status:Approved
Strunz 8th edition ID:5/K.09-30
Nickel-Strunz 10th (pending) edition ID:6.GB.10

6 : BORATES
G : Heptaborates and other megaborates
B : Phyllo-nonborates, etc.
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Type Occurrence of Penobsquisite

Type Locality:Potash Corporation of Saskatchewan Mine (PCS Mine; Potash Corporation of America Mine), Penobsquis, Cardwell Parish, Sussex, Kings Co., New Brunswick, Canada

Physical Properties of Penobsquisite

Lustre:Vitreous
Colour:Pale yellow
Hardness (Mohs):3

Crystallography of Penobsquisite

Crystal System:Monoclinic

Optical Data of Penobsquisite

Type:Biaxial (+/-)
RI values: nα = 1.550 nβ = 1.554 nγ = 1.592
Maximum Birefringence:δ = 0.042

Chart 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 Penobsquisite

Formula:
Ca
 
2
Fe
2+
 
[Cl|B
 
9
O
 
13
(OH)
 
6
]Cl · 4H
 
2
O
Essential elements:B, Ca, Cl, Fe, H, O
All elements listed in formula:B, Ca, Cl, Fe, H, O

Relationship of Penobsquisite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.GB.05Studenitsite
NaCa
 
2
[B
 
9
O
 
14
(OH)
 
4
]·2H
 
2
O
6.GB.15Preobrazhenskite
Mg
 
3
B
 
11
O
 
15
(OH)
 
9
6.GB.20Walkerite
Ca
 
16
(Mg,Li,[])
 
2
[B
 
13
O
 
17
(OH)
 
12
]
 
4
Cl
 
6
·28H
 
2
O

Other Names for Penobsquisite

Synonyms:
IMA1995-014
Other Languages:
German:Penobsquisit
Russian:Пенобсквисит
Spanish:Penobsquisita

Other Information

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

References for Penobsquisite

Reference List:Mineralogical Record: 28: 143-144.

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

American Mineralogist (1997): 82: 208.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

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    Localities for Penobsquisite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • New Brunswick
      • Kings Co.
        • Sussex
          • Cardwell Parish
            • Penobsquis
    		Canadian Mineralogist (1996): 34: 657-665.
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